new file mode 100644
@@ -0,0 +1,31 @@
+ EM Marin V3020 compatible RTC
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Required properties:
+ - compatible: "em,v3020", "v3020"
+ - reg: Memory address if mmio mode is used, otherwise not used.
+
+Optional properties:
+ - "leftshift": integer. Contains the leftshift parameter of
+ struct v3020_platform_data.
+ - "gpios": gpios property. Array of 4 OF gpio specifiers, which if specified
+ select gpio mode. The four gpios are gpio_cs, gpio_wr, gpio_rd and
+ gpio_io in this order. See Documentation/devicetree/bindings/gpio/gpio.txt
+
+Example for MMIO on MPC5121 localbus:
+
+ localbus@80000020 {
+ compatible = "fsl,mpc5121-localbus";
+ #address-cells = <2>;
+ #size-cells = <1>;
+ reg = <0x80000020 0x40>;
+ ranges = <0x0 0x0 0xfe000000 0x02000000 /* Flash */
+ 0x1 0x0 0xf8000000 0x00000004>; /* V3020 */
+ ...
+ v3020@1,0 {
+ compatible = "em,v3020", "v3020";
+ reg = <1 0 4>;
+ leftshift = <24>;
+ };
+ ...
+
@@ -11,6 +11,9 @@
*
* Changelog:
*
+ * 31-May-2011: David Jander <david@protonic.nl>
+ * - Added OF support
+ *
* 10-May-2006: Raphael Assenat <raph@8d.com>
* - Converted to platform driver
* - Use the generic rtc class
@@ -29,6 +32,8 @@
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/io.h>
@@ -301,9 +306,45 @@ static const struct rtc_class_ops v3020_rtc_ops = {
.set_time = v3020_set_time,
};
+#ifdef CONFIG_OF
+static void get_of_pdata(struct v3020_platform_data *pdata,
+ struct platform_device *pdev)
+{
+ const unsigned int *val;
+ unsigned int gpio;
+
+ memset(pdata, 0, sizeof *pdata);
+ if (of_find_property(pdev->dev.of_node, "gpios", NULL) != NULL) {
+ pdata->use_gpio = 1;
+ gpio = of_get_gpio_flags(pdev->dev.of_node, 0, NULL);
+ if (gpio >= 0)
+ pdata->gpio_cs = gpio;
+ gpio = of_get_gpio_flags(pdev->dev.of_node, 1, NULL);
+ if (gpio >= 0)
+ pdata->gpio_wr = gpio;
+ gpio = of_get_gpio_flags(pdev->dev.of_node, 2, NULL);
+ if (gpio >= 0)
+ pdata->gpio_rd = gpio;
+ gpio = of_get_gpio_flags(pdev->dev.of_node, 3, NULL);
+ if (gpio >= 0)
+ pdata->gpio_io = gpio;
+ } else {
+ val = of_get_property(pdev->dev.of_node, "leftshift", NULL);
+ if (val)
+ pdata->leftshift = *val;
+ }
+}
+#else
+static void get_of_pdata(struct v3020_platform_data *pdata,
+ struct platform_device *pdev)
+{
+}
+#endif
+
static int rtc_probe(struct platform_device *pdev)
{
struct v3020_platform_data *pdata = pdev->dev.platform_data;
+ struct v3020_platform_data alt_pdata;
struct v3020 *chip;
int retval = -EBUSY;
int i;
@@ -313,6 +354,11 @@ static int rtc_probe(struct platform_device *pdev)
if (!chip)
return -ENOMEM;
+ if (!pdata && pdev->dev.of_node) {
+ get_of_pdata(&alt_pdata, pdev);
+ pdata = &alt_pdata;
+ }
+
if (pdata->use_gpio)
chip->ops = &v3020_gpio_ops;
else
@@ -384,12 +430,23 @@ static int rtc_remove(struct platform_device *dev)
return 0;
}
+#ifdef CONFIG_OF
+const struct of_device_id v3020_of_match[] = {
+ {
+ .compatible = "v3020",
+ },
+};
+#endif
+
static struct platform_driver rtc_device_driver = {
.probe = rtc_probe,
.remove = rtc_remove,
.driver = {
.name = "v3020",
.owner = THIS_MODULE,
+#ifdef CONFIG_OF
+ .of_match_table = v3020_of_match,
+#endif
},
};
Added support for fetching platform data from OF device-tree. Signed-off-by: David Jander <david@protonic.nl> --- .../devicetree/bindings/rtc/rtc-v3020.txt | 31 +++++++++++ drivers/rtc/rtc-v3020.c | 57 ++++++++++++++++++++ 2 files changed, 88 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/rtc/rtc-v3020.txt