[RFC,1/3] of: Portable Device Tree connector

diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index 3d89e60..a004269 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -35,6 +35,26 @@  config EXTCON_AXP288
 	  Say Y here to enable support for USB peripheral detection
 	  and USB MUX switching by X-Power AXP288 PMIC.
 
+config EXTCON_DT_CON
+	tristate "Device Tree Overlay based connector"
+	depends on OF || COMPILE_TEST
+	depends on OF_OVERLAY
+	help
+	  Say Y here to enable Device Tree Overlay based connector
+
+config EXTCON_DT_CON_PROXY
+	tristate "Device Tree Connector Generic proxy driver"
+	select EXTCONF_DT_CON
+	help
+	  Say Y here to enable Device Tree generic proxy connector driver
+
+config EXTCON_DT_CON_GPIO
+	tristate "Device Tree Connector GPIO proxy driver"
+	depends on GPIOLIB && OF_GPIO
+	select EXTCONF_DT_GPIO
+	help
+	  Say Y here to enable Device Tree GPIO proxy connector driver
+
 config EXTCON_GPIO
 	tristate "GPIO extcon support"
 	depends on GPIOLIB || COMPILE_TEST
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 2a0e4f4..7db472d 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -6,6 +6,9 @@  obj-$(CONFIG_EXTCON)		+= extcon.o
 obj-$(CONFIG_EXTCON_ADC_JACK)	+= extcon-adc-jack.o
 obj-$(CONFIG_EXTCON_ARIZONA)	+= extcon-arizona.o
 obj-$(CONFIG_EXTCON_AXP288)	+= extcon-axp288.o
+obj-$(CONFIG_EXTCON_DT_CON)	+= extcon-dt-con.o
+obj-$(CONFIG_EXTCON_DT_CON_GPIO)+= extcon-dt-con-gpio.o
+obj-$(CONFIG_EXTCON_DT_CON_PROXY)+= extcon-dt-con-proxy.o
 obj-$(CONFIG_EXTCON_GPIO)	+= extcon-gpio.o
 obj-$(CONFIG_EXTCON_MAX14577)	+= extcon-max14577.o
 obj-$(CONFIG_EXTCON_MAX3355)	+= extcon-max3355.o
diff --git a/drivers/extcon/extcon-dt-con-gpio.c b/drivers/extcon/extcon-dt-con-gpio.c
new file mode 100644
index 0000000..41884ce
--- /dev/null
+++ b/drivers/extcon/extcon-dt-con-gpio.c
@@ -0,0 +1,337 @@ 
+/*
+ * Copyright (C) 2016 Konsulko Group
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+
+#include "extcon-dt-con.h"
+
+/* format: <gpio-phandle> <gpio-nr> <connector-pin-phandle> */
+#define GPIO_CELLS_NUM	3
+
+struct dtcon_gpio_func_data {
+	struct dtcon_function *function;
+	int gpio_base;
+	int gpio_cells;
+};
+
+/* indexed by gpio number */
+struct dtcon_gpio_pin_data {
+	struct dtcon_pin *dtcp;
+	struct device_node *chip_np;
+	struct gpio_chip *chip;	/* when requested */
+	int hwnum;
+	char *label;
+};
+
+struct dtcon_gpio_data {
+	struct platform_device *pdev;
+	struct gpio_chip chip;
+	struct dtcon_proxy *proxy;
+	struct dtcon_gpio_pin_data *pin_data;
+};
+#define to_dtcon_gpio_data(x) container_of((x), struct dtcon_gpio_data, chip)
+
+/* match when we got the same device node */
+static int dtcon_find_gpiochip(struct gpio_chip *gc, void *data)
+{
+	return gc->of_node == data;
+}
+
+static struct gpio_chip *dtcon_gpio_get_gpiochip(struct dtcon_gpio_data *dtcg,
+		unsigned offset)
+{
+	struct dtcon_gpio_pin_data *pin_data;
+	struct dtcon_pin *dtcp;
+
+	if (offset >= dtcg->chip.ngpio)
+		return NULL;
+
+	pin_data = &dtcg->pin_data[offset];
+	dtcp = pin_data->dtcp;
+
+	return gpiochip_find(pin_data->chip_np, dtcon_find_gpiochip);
+}
+
+static int dtcon_gpio_of_xlate(struct gpio_chip *chip,
+			     struct of_phandle_args *gpiospec,
+			     u32 *flags)
+{
+	struct dtcon_gpio_data *dtcg = to_dtcon_gpio_data(chip);
+	struct device *dev = &dtcg->pdev->dev;
+	struct dtcon_gpio_pin_data *pin_data;
+	struct gpio_chip *gc;
+
+	if (WARN_ON(gpiospec->args_count < chip->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= chip->ngpio)
+		return -EINVAL;
+
+	pin_data = &dtcg->pin_data[gpiospec->args[0]];
+	gc = pin_data->chip;
+
+	dev_dbg(dev, "%s: original:  np=%s args[0]=0x%08x args[1]=0x%08x\n",
+			__func__,
+			of_node_full_name(gpiospec->np),
+			gpiospec->args[0], gpiospec->args[1]);
+
+	dev_dbg(dev, "%s: translate: np=%s hwnum=0x%08x args[1]=0x%08x\n",
+			__func__,
+			of_node_full_name(gc->of_node),
+			pin_data->hwnum, 0);
+
+	/* point to new */
+	gpiospec->np = gc->of_node;
+	gpiospec->args[0] = pin_data->hwnum;
+
+	return -EAGAIN;
+
+}
+
+/* gpio function methods */
+static int dtcon_gpio_function_init(struct dtcon_function *dtcf)
+{
+	struct dtcon_data *dtcd = dtcf->dtcd;
+	struct device *dev = &dtcd->pdev->dev;
+	struct dtcon_gpio_func_data *dtcgf = NULL;
+	int err;
+	u32 num;
+
+	if (!dtcf->np) {
+		dev_err(dev, "No gpio function configuration node\n");
+		return -EINVAL;
+	}
+
+	dtcgf = kzalloc(sizeof(*dtcgf), GFP_KERNEL);
+	if (!dtcgf) {
+		dev_err(dev, "No memory for function data\n");
+		return -ENOMEM;
+	}
+	dtcf->data = dtcgf;
+
+	err = of_property_read_u32(dtcf->np, "gpio-base", &num);
+	if (err) {
+		dev_err(dev, "No gpio-base in function configuration\n");
+		err = -EINVAL;
+		goto err_out;
+	}
+
+	dtcgf->gpio_base = num;
+
+	/* format: <gpio-phandle> <gpio-nr> <connector-pin-phandle> */
+	dtcgf->gpio_cells = GPIO_CELLS_NUM;
+
+	return 0;
+
+err_out:
+	kfree(dtcgf);
+	return err;
+}
+
+static void dtcon_gpio_function_fini(struct dtcon_function *dtcf)
+{
+	struct dtcon_gpio_func_data *dtcgf = dtcf->data;
+
+	kfree(dtcgf);
+}
+
+static int dtcon_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct dtcon_gpio_data *dtcg;
+	struct dtcon_data *dtcd;
+	struct dtcon_function *dtcf;
+	struct dtcon_gpio_func_data *dtcgf;
+	struct dtcon_proxy *proxy;
+	struct dtcon_pin *dtcp;
+	struct dtcon_gpio_pin_data *pin_data;
+	struct of_phandle_args args;
+	const void *pin_regs;
+	int i, err, count, regsz, index;
+
+	if (!np) {
+		dev_err(dev, "No OF configuration node\n");
+		return -EINVAL;
+	}
+
+	count = of_property_count_elems_of_size(np, "pin-list", sizeof(u32));
+	pin_regs = of_get_property(np, "pin-list", NULL);
+	if (count <= 0 || !pin_regs) {
+		dev_err(dev, "Invalid configuration\n");
+		return -EINVAL;
+	}
+
+	dtcg = devm_kzalloc(dev, sizeof(*dtcg), GFP_KERNEL);
+	if (!dtcg) {
+		dev_err(dev, "Failed to allocate device data\n");
+		return -ENOMEM;
+	}
+	dtcg->pdev = pdev;
+
+	proxy = dtcon_proxy_create(pdev, "gpio", dtcon_gpio_function_init);
+	if (IS_ERR(proxy))
+		return PTR_ERR(proxy);
+
+	proxy->data = dtcg;
+	dtcg->proxy = proxy;
+
+	dtcf = dtcg->proxy->dtcf;
+	dtcgf = dtcf->data;
+	dtcd = dtcf->dtcd;
+
+	/* the count must be a multiple of address cell numbers */
+	if ((count % dtcd->connector_address_cells) != 0) {
+		dev_err(dev, "Bad pin-list \n");
+		err = -EINVAL;
+		goto out_destroy_proxy;
+	}
+
+	count /= dtcd->connector_address_cells;
+
+	dtcg->pin_data = devm_kzalloc(dev, sizeof(*dtcg->pin_data) * count,
+			GFP_KERNEL);
+	if (!dtcg->pin_data) {
+		dev_err(dev, "Failed to allocate pin data\n");
+		err = -ENOMEM;
+		goto out_destroy_proxy;
+	}
+
+	/* all methods NULL, we don't use them besides of_xlate */
+
+	dtcg->chip.label = np->name;
+	dtcg->chip.base = dtcgf->gpio_base;
+	dtcg->chip.ngpio = count;
+#ifdef CONFIG_OF_GPIO
+	dtcg->chip.of_gpio_n_cells = 2;
+	dtcg->chip.of_xlate = dtcon_gpio_of_xlate;
+	dtcg->chip.parent = dev;
+	dtcg->chip.of_node = of_node_get(np);
+#endif
+
+	/* request all pins */
+	regsz = sizeof(u32) * dtcd->connector_address_cells;
+	for (i = 0; i < count; i++, pin_regs += regsz) {
+
+		pin_data = &dtcg->pin_data[i];
+
+		dtcp = dtcon_proxy_pin_request(proxy, pin_regs, regsz, 0);
+		if (IS_ERR(dtcp)) {
+			dev_err(dev, "could not request gpio #%d\n", i);
+			err = PTR_ERR(dtcp);
+			goto out_release_pin;
+		}
+
+		pin_data->dtcp = dtcp;
+
+		err = of_parse_phandle_with_fixed_args(dtcp->np, "gpio", 1, 0, &args);
+		if (err) {
+			dev_err(dev, "could not #%d parse gpio property\n", i);
+			goto out_release_pin;
+		}
+		pin_data->chip_np = args.np;
+		pin_data->hwnum = args.args[0];
+
+		pin_data->chip = dtcon_gpio_get_gpiochip(dtcg, i);
+		if (!pin_data->chip) {
+			dev_err(dev, "gpio #%d index #%d not found\n",
+					i, index);
+			/* the other device might not come up yet */
+			err = -EPROBE_DEFER;
+			goto out_release_pin;
+		}
+		pin_data->label = devm_kasprintf(dev, GFP_KERNEL,
+				"%s:%d", np->name, i);
+		if (!pin_data->label) {
+			dev_err(dev, "gpio #%d index #%d label alloc\n",
+					i, index);
+			/* the other device might not come up yet */
+			err = -ENOMEM;
+			goto out_release_pin;
+		}
+
+		dev_dbg(dev, "gpio #%d -> %-8s @ %s\n",
+				i, dtcp->regstr, dtcp->np->name);
+	}
+
+	err = gpiochip_add_data(&dtcg->chip, dtcg);
+	if (err) {
+		dev_err(dev, "Could not register gpio chip %d\n", err);
+		goto out_release_pin;
+	}
+
+	/* advance base */
+	dtcgf->gpio_base += count;
+
+	platform_set_drvdata(pdev, dtcg);
+
+	return 0;
+
+out_release_pin:
+	while (i-- >= 0) {
+		pin_data = &dtcg->pin_data[i];
+		of_node_put(pin_data->chip_np);
+		dtcon_proxy_pin_release(proxy, pin_data->dtcp);
+	}
+
+out_destroy_proxy:
+	dtcon_proxy_destroy(dtcg->proxy, dtcon_gpio_function_fini);
+	return err;
+}
+
+static int dtcon_gpio_remove(struct platform_device *pdev)
+{
+	struct dtcon_gpio_data *dtcg = platform_get_drvdata(pdev);
+	struct dtcon_proxy *proxy = dtcg->proxy;
+	struct dtcon_gpio_pin_data *pin_data;
+	int i;
+
+	for (i = 0; i < dtcg->chip.ngpio; i++) {
+		pin_data = &dtcg->pin_data[i];
+		of_node_put(pin_data->chip_np);
+		dtcon_proxy_pin_release(proxy, pin_data->dtcp);
+	}
+
+	gpiochip_remove(&dtcg->chip);
+	dtcon_proxy_destroy(dtcg->proxy, dtcon_gpio_function_fini);
+	return 0;
+}
+
+static const struct of_device_id dtcon_gpio_of_match[] = {
+	{ .compatible = "dtcon-gpio", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, dtcon_gpio_of_match);
+
+static struct platform_driver dtcon_gpio = {
+	.probe = dtcon_gpio_probe,
+	.remove = dtcon_gpio_remove,
+	.driver = {
+		.name = "dtcon-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = dtcon_gpio_of_match,
+	}
+};
+
+module_platform_driver(dtcon_gpio);
+MODULE_AUTHOR("Pantelis Antoniou <pantelis.antoniou@konsulko.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/extcon/extcon-dt-con-proxy.c b/drivers/extcon/extcon-dt-con-proxy.c
new file mode 100644
index 0000000..dbbbc0e
--- /dev/null
+++ b/drivers/extcon/extcon-dt-con-proxy.c
@@ -0,0 +1,480 @@ 
+/*
+ * Copyright (C) 2016 Konsulko Group
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+
+#include "extcon-dt-con.h"
+
+static const struct of_device_id dtcon_proxy_of_match[] = {
+	{ .compatible = "dtcon-uart", .data = "uart" },
+	{ .compatible = "dtcon-i2c",  .data = "i2c"  },
+	{ .compatible = "dtcon-spi",  .data = "spi"  },
+	{},
+};
+MODULE_DEVICE_TABLE(of, dtcon_proxy_of_match);
+
+struct dtcon_proxy_data {
+	struct platform_device *pdev;
+	struct dtcon_proxy *proxy;
+	struct of_changeset ocs;
+	struct device_node *paramsnp;
+	int param_cells;
+};
+
+static int dtcon_proxy_parse_params(struct dtcon_proxy_data *dtcpd)
+{
+	struct device *dev = &dtcpd->pdev->dev;
+	struct dtcon_proxy *proxy = dtcpd->proxy;
+	struct dtcon_function *dtcf = proxy->dtcf;
+	struct device_node *np;
+	struct dtcon_pin *dtcp;
+	const void *value;
+	int err, len;
+	u32 num;
+
+	dtcpd->paramsnp = of_get_child_by_name(dtcf->np, "params");
+
+	/* no parameters? no problem */
+	if (!dtcpd->paramsnp)
+		return -EINVAL;
+
+	/* get number of param cells */
+	if (of_property_read_u32(dtcpd->paramsnp, "#param-cells", &num))
+		num = 2;
+
+	dtcpd->param_cells = num;
+
+	/* iterate over list of parameters */
+	err = 0;
+	for_each_child_of_node(dtcpd->paramsnp, np) {
+		value = of_get_property(dev->of_node, np->name, &len);
+		if (!value) {
+			/* ignore non-required parameter */
+			if (!of_property_read_bool(np, "required"))
+				continue;
+			/* missing required parameter */
+			dev_err(dev, "%s: Missing required parameter %s\n",
+					dtcf->kind, np->name);
+err_out:
+			of_node_put(np);
+			err = -EINVAL;
+			goto out;
+		}
+
+		/* we have a parameter; instantiate it */
+		dev_dbg(dev, "%s: param %s\n", dtcf->kind,
+				np->name);
+
+		/* connector-pin parameter <connector reg address> */
+		if (of_property_read_bool(np, "connector-pin")) {
+			dtcp = dtcon_proxy_pin_request(proxy, value, len, 0);
+			if (!dtcp) {
+				dev_err(dev, "%s: failed to request %s's pin\n",
+						dtcf->kind, np->name);
+				goto err_out;
+			}
+			/* no need to keep dtcp around; it's on proxy's list */
+			dev_info(dev, "%s: %s pin is @%s\n", dtcf->kind,
+					np->name, dtcp->np->name);
+
+			dtcp->param = of_node_get(np);
+			/* need to iterate over the mux options for matches */
+		}
+	}
+out:
+	return err;
+}
+
+static int dtcon_proxy_grade_single(struct dtcon_proxy_data *dtcpd,
+		struct device_node *fnp, struct device_node *devnp,
+		struct device_node *muxnp)
+{
+	struct device *dev = &dtcpd->pdev->dev;
+	struct dtcon_pin *dtcp;
+	struct dtcon_proxy *proxy = dtcpd->proxy;
+	int ret, paramsz, paramcells, i, count, len, match, score;
+	const char *param, *gpio_prop;
+	const __be32 *paramp;
+	bool avail;
+	u32 ph;
+
+	if (!devnp)
+		return 0;
+
+	paramcells = dtcpd->param_cells;
+	paramsz = paramcells * sizeof(u32);
+
+	score = 0;
+	list_for_each_entry(dtcp, &proxy->proxy_pin_list, proxy_node) {
+
+		param = dtcp->param->name;
+		paramp = of_get_property(muxnp, param, &len);
+
+		/* no such parameter? */
+		if (!paramp) {
+			/* GPIO parameters only on disabled devices */
+			if (of_device_is_available(devnp)) {
+				dev_err(dev, "param %s with enabled device\n", param);
+				score = 0;
+				break;
+			}
+
+			ret = of_property_read_string(dtcp->param,
+					"gpio-property", &gpio_prop);
+			if (ret) {
+				dev_err(dev, "no param %s\n", param);
+				score = 0;
+				break;
+			}
+			dtcp->proxy_gpio = true;
+			/* gpio matches have a low score */
+			score++;
+			continue;
+		}
+
+		/* not-there? malformed? bail out */
+		if ((len % paramsz))  {
+			dev_err(dev, "malformed param %s\n", param);
+			score = 0;
+			break;
+		}
+
+		count = len / paramsz;
+
+		match = 0;
+		for (i = 0; i < count; i++, paramp += paramcells) {
+			/* get phandle of connector pin */
+			ph = be32_to_cpu(paramp[0]);
+			if (ph != dtcp->np->phandle)
+				continue;
+
+			avail = of_device_is_available(devnp);
+			/* when not preeneabled
+			* -> device must be disabled
+			* when preenabled
+			* -> device must be enabled
+			*/
+			if (of_property_read_bool(muxnp, "pre-enabled"))
+				match = avail;
+			else
+				match = !avail;
+
+			if (match) {
+				dtcp->proxy_gpio = false;
+				/* pinmux changes only on disabled devices */
+				if (!avail) {
+					ph = be32_to_cpu(paramp[1]);
+					dtcp->match_mux = ph;
+				}
+				score += (1 << 16);
+				break;
+			}
+		}
+
+		if (!match)
+			return 0;
+	}
+
+	return score;
+}
+
+static int dtcon_proxy_instantiate(struct dtcon_proxy_data *dtcpd)
+{
+	struct device *dev = &dtcpd->pdev->dev;
+	struct dtcon_proxy *proxy = dtcpd->proxy;
+	struct dtcon_function *dtcf = proxy->dtcf;
+	struct device_node *np, *fnp, *devnp, *muxnp, *best_devnp;
+	struct dtcon_pin *dtcp;
+	int err, len, count, score, best_score, arg_len;
+	const void *value;
+	const char *gpio_prop;
+	const void *arg_value;
+	void *data;
+	__be32 *muxp;
+
+	err = 0;
+
+	/* iterate over the device targets */
+	best_score = 0;
+	best_devnp = NULL;
+	for_each_child_of_node(dtcf->np, fnp) {
+		devnp = of_parse_phandle(fnp, "device", 0);
+		if (!devnp)
+			continue;
+		for_each_child_of_node(fnp, muxnp) {
+
+			score = dtcon_proxy_grade_single(dtcpd, fnp,
+							 devnp, muxnp);
+
+			if (score <= best_score)
+				continue;
+
+			/* new best score */
+			best_score = score;
+			of_node_put(best_devnp);
+			best_devnp = of_node_get(devnp);
+			list_for_each_entry(dtcp, &proxy->proxy_pin_list,
+					    proxy_node) {
+
+				/* if it's a GPIO do not select it */
+				if (dtcp->proxy_gpio)
+					continue;
+
+				of_node_put(dtcp->pinctrl);
+				dtcp->pinctrl = of_find_node_by_phandle(
+						dtcp->match_mux);
+				dtcp->match_mux = 0;
+			}
+		}
+		of_node_put(devnp);
+	}
+
+	if (best_score == 0) {
+		dev_info(dev, "no matching proxy config\n");
+		return -ENODEV;
+	}
+
+	devnp = best_devnp;
+	best_devnp = NULL;
+
+	dev_dbg(dev, "matches device %s\n", devnp->full_name);
+
+	/* need to copy subdevices? */
+	if (of_property_read_bool(dtcpd->paramsnp, "copy-subdevices")) {
+		for_each_available_child_of_node(dev->of_node, np) {
+			err = of_changeset_node_move(&dtcpd->ocs, np, devnp);
+			if (err) {
+				dev_err(dev, "Failed to move nodes\n");
+				of_node_put(np);
+				goto err_out;
+			}
+		}
+	}
+
+	/* changes only allowed to non-activated devices */
+	if (!of_device_is_available(devnp)) {
+
+		/* iterate over parameters */
+
+		/* iterate over list of parameters */
+		for_each_child_of_node(dtcpd->paramsnp, np) {
+			if (!of_property_read_bool(np, "copy"))
+				continue;
+
+			value = of_get_property(dev->of_node, np->name, &len);
+			if (!value) {
+				if (!of_property_read_bool(np, "required"))
+					continue;
+				dev_err(dev, "Missing required property %s\n",
+						np->name);
+				of_node_put(np);
+				err = -ENODEV;
+				goto err_out;
+			}
+
+			of_changeset_update_property_copy(&dtcpd->ocs, devnp,
+				np->name, value, len);
+
+		}
+
+		/* generate pinctrl for each pin of the connector */
+		if (of_property_read_bool(dtcpd->paramsnp,
+					"generate-pinctrl")) {
+			/* count the pinctrl entries we're going to need */
+			count = 0;
+			list_for_each_entry(dtcp, &proxy->proxy_pin_list,
+					proxy_node) {
+				if (dtcp->pinctrl)
+					count++;
+			}
+
+			if (count > 0) {
+				muxp = kzalloc(sizeof(u32) * count, GFP_KERNEL);
+				if (!muxp) {
+					dev_err(dev,
+						"Failed to allocate pinmux\n");
+					err = -ENOMEM;
+					goto err_out;
+				}
+
+				count = 0;
+				list_for_each_entry(dtcp,
+						&proxy->proxy_pin_list,
+						proxy_node) {
+					if (!dtcp->pinctrl)
+						continue;
+					muxp[count++] = cpu_to_be32(
+							dtcp->pinctrl->phandle);
+				}
+
+				of_changeset_update_property_string(&dtcpd->ocs,
+						devnp, "pinctrl-names",
+						"default");
+				of_changeset_update_property_copy(&dtcpd->ocs,
+						devnp, "pinctrl-0", muxp,
+						sizeof(u32) * count);
+
+				kfree(muxp);
+			}
+		}
+
+		/* fill in gpio properties if required */
+		list_for_each_entry(dtcp, &proxy->proxy_pin_list, proxy_node) {
+			if (!dtcp->proxy_gpio)
+				continue;
+			err = of_property_read_string(dtcp->param,
+					"gpio-property", &gpio_prop);
+			if (err) {
+				dev_err(dev,
+					"Failed to read gpio-property name %s\n",
+					dtcp->param->name);
+				goto err_out;
+			}
+			value = of_get_property(dtcp->np, "gpio", &len);
+			if (!value) {
+				dev_err(dev,
+					"Failed on gpio name %s - %s\n",
+					dtcp->param->name, dtcp->np->name);
+				err = -EINVAL;
+				goto err_out;
+			}
+			arg_value = of_get_property(dtcp->param,
+					"gpio-args", &arg_len);
+			if (!arg_value) {
+				dev_err(dev,
+					"Failed on gpio-args name %s - %s\n",
+					dtcp->param->name, dtcp->param->name);
+				err = -EINVAL;
+				goto err_out;
+			}
+			data = kmalloc(len + arg_len, GFP_KERNEL);
+			if (!data) {
+				dev_err(dev,
+					"Failed to allocate %s - %s\n",
+					dtcp->param->name, dtcp->param->name);
+				err = -ENOMEM;
+				goto err_out;
+			}
+			memcpy(data, value, len);
+			memcpy(data + len, arg_value, arg_len);
+			of_changeset_add_property_copy(&dtcpd->ocs, devnp,
+				gpio_prop, data, len + arg_len);
+			kfree(data);
+		}
+
+		/* enabled target device and go */
+		of_changeset_update_property_string(&dtcpd->ocs, devnp,
+				"status", "okay");
+	}
+
+	of_changeset_apply(&dtcpd->ocs);
+
+	of_node_put(devnp);
+	of_node_put(muxnp);
+
+	return 0;
+
+err_out:
+	of_changeset_destroy(&dtcpd->ocs);
+
+	of_node_put(devnp);
+
+	return err;
+}
+
+static int dtcon_proxy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct dtcon_proxy *proxy;
+	struct dtcon_function *dtcf;
+	struct dtcon_proxy_data *dtcpd;
+	const struct of_device_id *of_id;
+	const char *function;
+	int err;
+
+	of_id = of_match_device(dtcon_proxy_of_match, dev);
+	if (!of_id) {
+		dev_err(dev, "Could not match device\n");
+		return -ENODEV;
+	}
+	function = of_id->data;
+
+	dtcpd = devm_kzalloc(dev, sizeof(*dtcpd), GFP_KERNEL);
+	if (!dtcpd) {
+		dev_err(dev, "Failed to allocate device data\n");
+		return -ENOMEM;
+	}
+	dtcpd->pdev = pdev;
+	of_changeset_init(&dtcpd->ocs);
+
+	proxy = dtcon_proxy_create(pdev, function, NULL);
+	if (IS_ERR(proxy))
+		return PTR_ERR(proxy);
+
+	dtcpd->proxy = proxy;
+
+	dtcf = proxy->dtcf;
+
+	platform_set_drvdata(pdev, dtcpd);
+
+	err = dtcon_proxy_parse_params(dtcpd);
+	if (err) {
+		dev_err(dev, "Failed to parse params\n");
+		return err;
+	}
+
+	err = dtcon_proxy_instantiate(dtcpd);
+	if (err) {
+		dev_err(dev, "Failed to instantiate device\n");
+		return err;
+	}
+
+	dev_info(dev, "OK\n");
+
+	return 0;
+}
+
+static int dtcon_proxy_remove(struct platform_device *pdev)
+{
+	struct dtcon_proxy_data *dtcpd = platform_get_drvdata(pdev);
+
+	of_changeset_revert(&dtcpd->ocs);
+	of_changeset_destroy(&dtcpd->ocs);
+	dtcon_proxy_destroy(dtcpd->proxy, NULL);
+	of_node_put(dtcpd->paramsnp);
+	return 0;
+}
+
+static struct platform_driver dtcon_proxy = {
+	.probe = dtcon_proxy_probe,
+	.remove = dtcon_proxy_remove,
+	.driver = {
+		.name = "dtcon-proxy",
+		.owner = THIS_MODULE,
+		.of_match_table = dtcon_proxy_of_match,
+	}
+};
+
+module_platform_driver(dtcon_proxy);
+MODULE_AUTHOR("Pantelis Antoniou <pantelis.antoniou@konsulko.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/extcon/extcon-dt-con.c b/drivers/extcon/extcon-dt-con.c
new file mode 100644
index 0000000..fbc1a35
--- /dev/null
+++ b/drivers/extcon/extcon-dt-con.c
@@ -0,0 +1,491 @@ 
+/*
+ *  drivers/extcon/extcon-dt-conn.c
+ *
+ *  Device Tree Overlay based connector driver.
+ *
+ * Copyright (C) 2015 Konsulko Group.
+ * Author: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+*/
+
+#include <linux/extcon.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
+#include "extcon-dt-con.h"
+
+static const unsigned int dtcon_cable[] = {
+	EXTCON_NONE,
+};
+
+static int dtcon_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node, *npn;
+	struct dtcon_data *dtcd;
+	struct dtcon_pin *dtcp;
+	const __be32 *regp;
+	int regsz, regcells, sz, count, len, i, j, err;
+	char *s, *e;
+	u32 num;
+
+	if (!np) {
+		dev_err(dev, "No device node\n");
+		return -ENODEV;
+	}
+
+	dtcd = devm_kzalloc(dev, sizeof(*dtcd), GFP_KERNEL);
+	if (!dtcd) {
+		dev_err(dev, "Failed to allocated data structure\n");
+		return -ENOMEM;
+	}
+	INIT_LIST_HEAD(&dtcd->pin_list);
+	INIT_LIST_HEAD(&dtcd->function_list);
+
+	dtcd->pdev = pdev;
+	dtcd->edev = devm_extcon_dev_allocate(dev, dtcon_cable);
+	if (IS_ERR(dtcd->edev)) {
+		dev_err(dev, "Failed to allocate extcon device\n");
+		err = PTR_ERR(dtcd->edev);
+		return err;
+	}
+
+	err = devm_extcon_dev_register(dev, dtcd->edev);
+	if (err < 0) {
+		dev_err(dev, "Failed to register extcon device\n");
+		return err;
+	}
+
+	platform_set_drvdata(pdev, dtcd);
+
+	dtcd->connector = of_get_child_by_name(np, "connector");
+	dtcd->functions = of_get_child_by_name(np, "functions");
+	dtcd->plugged = of_get_child_by_name(np, "plugged");
+
+	err = -EINVAL;
+
+	if (!dtcd->connector || !dtcd->functions || !dtcd->plugged) {
+		dev_err(dev, "Bad OF configuration\n");
+		goto out_err;
+	}
+
+	/* if no property return 1 */
+	err = of_property_read_u32(dtcd->connector, "#address-cells", &num);
+	if (err < 0)
+		num = 1;
+	dtcd->connector_address_cells = num;
+
+	/* if no property return 0 */
+	err = of_property_read_u32(dtcd->connector, "#size-cells", &num);
+	if (err < 0)
+		num = 0;
+	dtcd->connector_size_cells = num;
+	if (dtcd->connector_size_cells != 0) {
+		dev_err(dev, "Only #size-cells = <0>; supported for now\n");
+		err = -EINVAL;
+		goto out_err;
+	}
+
+	regcells = dtcd->connector_address_cells;
+	regsz = sizeof(u32) * regcells;
+	for_each_child_of_node(dtcd->connector, npn) {
+		regp = of_get_property(npn, "reg", &len);
+		if (!regp || (len % regsz)) {
+			dev_err(dev, "Bad connector pin @%s\n", npn->name);
+			of_node_put(npn);
+			goto out_err;
+		}
+
+		dtcp = devm_kzalloc(dev, sizeof(*dtcp), GFP_KERNEL);
+		if (!dtcp) {
+			dev_err(dev, "Failed to allocate pin node\n");
+			err = -ENOMEM;
+			of_node_put(npn);
+			goto out_err;
+		}
+		/* keep it and add it to the list */
+		dtcp->np = of_node_get(npn);
+
+		/* convert to number of reg ranges */
+		count = len / regsz;
+		/* max reg is ,<4294967295> */
+		sz = strlen(",<4294967295>") * count * regcells + 2;
+		dtcp->regstr = devm_kmalloc(dev, sz, GFP_KERNEL);
+		if (!dtcp->regstr) {
+			dev_err(dev, "Failed to allocate reg string\n");
+			err = -ENOMEM;
+			of_node_put(npn);
+			goto out_err;
+		}
+		s = dtcp->regstr;
+		e = dtcp->regstr + sz;
+		for (i = 0; i < count; i++, regp += regcells) {
+			if (i > 0)
+				*s++ = ',';
+			*s++ = '<';
+			for (j = 0; j < regcells; j++) {
+				len = scnprintf(s, e - s, "%u",
+						be32_to_cpu(regp[j]));
+				s += len;
+				if (j + 1 < regcells)
+					*s++ = ' ';
+			}
+			*s++ = '>';
+		}
+		*s = '\0';
+
+		list_add_tail(&dtcp->node, &dtcd->pin_list);
+	}
+
+	/* populate anything in plugged */
+	of_platform_default_populate(dev->of_node, NULL, dev);
+
+	dev_info(dev, "OK\n");
+
+	return 0;
+
+out_err:
+	if (dtcd) {
+		list_for_each_entry_reverse(dtcp, &dtcd->pin_list, node)
+			of_node_put(dtcp->np);
+		of_node_put(dtcd->connector);
+		of_node_put(dtcd->functions);
+		of_node_put(dtcd->plugged);
+	}
+
+	/* no need to manually deallocate, it's all devm */
+	return err;
+}
+
+static int dtcon_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct dtcon_data *dtcd = platform_get_drvdata(pdev);
+	struct dtcon_pin *dtcp;
+
+	dev_info(dev, "removing\n");
+
+	list_for_each_entry_reverse(dtcp, &dtcd->pin_list, node)
+		of_node_put(dtcp->np);
+	of_node_put(dtcd->connector);
+	of_node_put(dtcd->functions);
+	of_node_put(dtcd->plugged);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int dtcon_resume(struct device *dev)
+{
+	struct dtcon_data *dtcd;
+
+	dtcd = dev_get_drvdata(dev);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dtcon_pm_ops, NULL, dtcon_resume);
+
+static const struct of_device_id dtcon_of_match[] = {
+	{
+		.compatible = "extcon,dt-con",
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, dtcon_of_match);
+
+static struct platform_driver dtcon_driver = {
+	.probe		= dtcon_probe,
+	.remove		= dtcon_remove,
+	.driver		= {
+		.name	= "extcon-dt-con",
+		.pm	= &dtcon_pm_ops,
+		.of_match_table = of_match_ptr(dtcon_of_match),
+	},
+};
+
+module_platform_driver(dtcon_driver);
+
+/* get the dtcon data from a platform device that's a descendant */
+struct dtcon_data *dtcon_data_from_platform_device(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct dtcon_data *dtcd;
+	struct device *parent;
+
+	/* we need to find the connector which must be a parent */
+	for (parent = dev->parent; parent; parent = parent->parent) {
+		if (parent->of_node &&
+			of_device_is_compatible(parent->of_node,
+				dtcon_of_match[0].compatible)) {
+			break;
+		}
+	}
+
+	if (!parent) {
+		dev_err(dev, "Device is not a child of a connector\n");
+		return NULL;
+	}
+
+	/* get pointer to connector data */
+	dtcd = platform_get_drvdata(to_platform_device(parent));
+	if (!dtcd) {
+		dev_err(dev, "Missing connector data\n");
+		return NULL;
+	}
+
+	return dtcd;
+}
+EXPORT_SYMBOL(dtcon_data_from_platform_device);
+
+struct dtcon_pin *dtcon_pin_lookup(struct dtcon_data *dtcd,
+		const void *regp, int regsz)
+{
+	struct dtcon_pin *dtcp = NULL;
+	const void *value;
+	int i, len;
+
+	if (!dtcd || !regp)
+		return NULL;
+
+	/* must be the same size as the address cells */
+	if (regsz != dtcd->connector_address_cells * sizeof(u32))
+		return NULL;
+
+	/* no size cells supported */
+	if (dtcd->connector_size_cells != 0)
+		return NULL;
+
+	/* find pin with the given reg */
+	list_for_each_entry(dtcp, &dtcd->pin_list, node) {
+		value = of_get_property(dtcp->np, "reg", &len);
+
+		/* check that it exists and is a multiple */
+		if (!value || (len % regsz) != 0)
+			continue;
+
+		/* iterate over all */
+		for (i = 0; i < len; i += regsz, value += regsz) {
+			if (memcmp(value, regp, regsz) == 0)
+				goto found;
+		}
+	}
+
+	return NULL;
+
+found:
+	return dtcp;
+}
+EXPORT_SYMBOL(dtcon_pin_lookup);
+
+struct dtcon_pin *dtcon_pin_lookup_by_node(struct dtcon_data *dtcd,
+		struct device_node *np)
+{
+	struct dtcon_pin *dtcp = NULL;
+
+	if (!dtcd)
+		return NULL;
+
+	/* release all pins of this proxy */
+	list_for_each_entry(dtcp, &dtcd->pin_list, node) {
+		if (dtcp->np == np)
+			return dtcp;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(dtcon_pin_lookup_by_node);
+
+struct dtcon_pin *dtcon_pin_lookup_by_phandle(struct dtcon_data *dtcd,
+		phandle phandle)
+{
+	struct device_node *np = of_find_node_by_phandle(phandle);
+	struct dtcon_pin *dtcp;
+
+	if (!np)
+		return NULL;
+
+	dtcp = dtcon_pin_lookup_by_node(dtcd, np);
+	of_node_put(np);
+	return dtcp;
+}
+EXPORT_SYMBOL(dtcon_pin_lookup_by_phandle);
+
+struct dtcon_pin *dtcon_proxy_pin_request(struct dtcon_proxy *proxy,
+		const void *regp, int regsz, unsigned int flags)
+{
+	struct dtcon_data *dtcd;
+	struct dtcon_pin *dtcp;
+	struct device *dev;
+
+	if (!proxy || !regp)
+		return ERR_PTR(-EINVAL);
+
+	dtcd = proxy->dtcf->dtcd;
+	dev = &dtcd->pdev->dev;
+	dtcp = dtcon_pin_lookup(dtcd, regp, regsz);
+	if (!dtcp)
+		return ERR_PTR(-ENXIO);
+
+	dtcp->proxy = proxy;
+	dtcp->data = NULL;
+	list_add_tail(&dtcp->proxy_node, &proxy->proxy_pin_list);
+
+	return dtcp;
+}
+EXPORT_SYMBOL(dtcon_proxy_pin_request);
+
+int dtcon_proxy_pin_release(struct dtcon_proxy *proxy, struct dtcon_pin *dtcp)
+{
+	if (!proxy || !dtcp || dtcp->proxy != proxy)
+		return -EINVAL;
+
+	list_del(&dtcp->proxy_node);
+	dtcp->proxy = NULL;
+	dtcp->data = NULL;
+
+	/* proxy device data release */
+	of_node_put(dtcp->param);
+	of_node_put(dtcp->pinctrl);
+	dtcp->param = NULL;
+	dtcp->pinctrl = NULL;
+	return 0;
+}
+EXPORT_SYMBOL(dtcon_proxy_pin_release);
+
+/* dtcon function methods */
+struct dtcon_function *dtcon_function_lookup(struct dtcon_data *dtcd,
+		const char *kind)
+{
+	struct dtcon_function *dtcf;
+
+	/* lookup function by kind */
+	list_for_each_entry(dtcf, &dtcd->function_list, node) {
+		if (strcmp(dtcf->kind, kind) == 0)
+			return dtcf;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(dtcon_function_lookup);
+
+/* proxy device methods */
+struct dtcon_proxy *dtcon_proxy_create(struct platform_device *pdev,
+		const char *kind,
+		int (*func_init)(struct dtcon_function *dtcf))
+{
+	struct device *dev = &pdev->dev;
+	struct dtcon_data *dtcd;
+	struct dtcon_proxy *proxy;
+	struct dtcon_function *dtcf;
+	int err;
+
+	/* get connector data from a parent */
+	dtcd = dtcon_data_from_platform_device(pdev);
+	if (!dtcd) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	proxy = kzalloc(sizeof(*proxy), GFP_KERNEL);
+	if (!proxy) {
+		dev_err(dev, "Failed to allocate proxy data\n");
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	/* lookup function */
+	dtcf = dtcon_function_lookup(dtcd, kind);
+	if (dtcf == NULL) {
+		dtcf = kzalloc(sizeof(*dtcf), GFP_KERNEL);
+		if (!dtcf) {
+			dev_err(dev, "Failed to allocate proxy data\n");
+			err = -ENOMEM;
+			goto err_free_proxy;
+		}
+		dtcf->dtcd = dtcd;
+		dtcf->kind = kind;
+		dtcf->np = of_get_child_by_name(dtcd->functions, kind);
+		INIT_LIST_HEAD(&dtcf->proxy_list);
+
+		if (func_init) {
+			err = (*func_init)(dtcf);
+			if (err) {
+				dev_err(dev, "function init failed\n");
+				kfree(dtcf);
+				goto err_free_proxy;
+			}
+		}
+		list_add_tail(&dtcf->node, &dtcd->function_list);
+	}
+
+	proxy->pdev = pdev;
+	proxy->dtcf = dtcf;
+
+	INIT_LIST_HEAD(&proxy->proxy_pin_list);
+
+	list_add_tail(&proxy->node, &dtcf->proxy_list);
+
+	return proxy;
+
+err_free_proxy:
+	kfree(proxy);
+err_out:
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(dtcon_proxy_create);
+
+void dtcon_proxy_destroy(struct dtcon_proxy *proxy,
+		void (*func_fini)(struct dtcon_function *dtcf))
+{
+	struct dtcon_data *dtcd;
+	struct dtcon_function *dtcf;
+	struct dtcon_pin *dtcp, *dtcpn;
+
+	if (!proxy || !proxy->dtcf)
+		return;
+
+	dtcf = proxy->dtcf;
+	dtcd = dtcf->dtcd;
+
+	list_del(&proxy->node);
+
+	/* last proxy; remove function */
+	if (list_empty(&dtcf->proxy_list)) {
+		list_del(&dtcf->node);
+		if (func_fini)
+			(*func_fini)(dtcf);
+		of_node_put(dtcf->np);
+		kfree(dtcf);
+	}
+
+	/* release all pins of this proxy */
+	list_for_each_entry_safe_reverse(dtcp, dtcpn,
+			&proxy->proxy_pin_list, proxy_node)
+		dtcon_proxy_pin_release(proxy, dtcp);
+
+	kfree(proxy);
+}
+EXPORT_SYMBOL(dtcon_proxy_destroy);
+
+MODULE_AUTHOR("Pantelis Antoniou <pantelis.antoniou@konsulko.com>");
+MODULE_DESCRIPTION("DT connector extcon driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:extcon-dt-con");
diff --git a/drivers/extcon/extcon-dt-con.h b/drivers/extcon/extcon-dt-con.h
new file mode 100644
index 0000000..9f08f1d
--- /dev/null
+++ b/drivers/extcon/extcon-dt-con.h
@@ -0,0 +1,93 @@ 
+/*
+ * dt-con.h
+ *
+ * Copyright (c) 2016 Konsulko Group
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#ifndef __LINUX_EXTCON_DT_CON_H
+#define __LINUX_EXTCON_DT_CON_H
+
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+struct dtcon_proxy;
+
+struct dtcon_pin {
+	struct list_head node;
+	struct device_node *np;
+	char *regstr;	/* connector reg prop */
+
+	/* owner of the pin */
+	struct dtcon_proxy *proxy;
+	struct list_head proxy_node;
+	void *data;
+
+	/* proxy device data */
+	struct device_node *param;
+
+	/* pinctrl config device node */
+	bool proxy_gpio;
+	struct device_node *pinctrl;
+	phandle match_mux;
+};
+
+struct dtcon_data {
+	struct platform_device *pdev;
+	struct extcon_dev *edev;
+
+	struct device_node *connector;
+	unsigned int connector_address_cells;
+	unsigned int connector_size_cells;
+
+	struct device_node *functions;
+	struct device_node *plugged;
+	struct list_head pin_list;
+
+	struct list_head function_list;
+};
+
+struct dtcon_function {
+	struct dtcon_data *dtcd;
+	struct list_head node;
+	const char *kind;
+	struct device_node *np;
+	struct list_head proxy_list;
+	void *data;
+};
+
+struct dtcon_proxy {
+	struct platform_device *pdev;
+	struct dtcon_function *dtcf;
+	struct list_head node;
+
+	struct list_head proxy_pin_list;
+
+	void *data;
+};
+
+struct dtcon_data *dtcon_data_from_platform_device(
+		struct platform_device *pdev);
+
+struct dtcon_proxy *dtcon_proxy_create(struct platform_device *pdev,
+		const char *kind,
+		int (*func_init)(struct dtcon_function *dtcf));
+void dtcon_proxy_destroy(struct dtcon_proxy *proxy,
+		void (*func_fini)(struct dtcon_function *dtcf));
+
+struct dtcon_pin *dtcon_pin_lookup(struct dtcon_data *dtcd,
+		const void *regp, int regsz);
+struct dtcon_pin *dtcon_pin_lookup_by_node(struct dtcon_data *dtcd,
+		struct device_node *np);
+struct dtcon_pin *dtcon_pin_lookup_by_phandle(struct dtcon_data *dtcd,
+		phandle phandle);
+struct dtcon_pin *dtcon_proxy_pin_request(struct dtcon_proxy *proxy,
+		const void *regp, int regsz, unsigned int flags);
+int dtcon_proxy_pin_release(struct dtcon_proxy *proxy, struct dtcon_pin *dtcp);
+
+
+#endif /* __LINUX_EXTCON_DT_CON_H */