diff mbox series

[v10,1/7] usb: onboard-hub: Add reset-gpio support

Message ID 20241108035959.19970-2-venkatesh.abbarapu@amd.com
State New
Headers show
Series Add the USB5744 hub driver as per new DT binding | expand

Commit Message

Venkatesh Yadav Abbarapu Nov. 8, 2024, 3:59 a.m. UTC 
As part of the reset, sets the direction of the pin to output before
toggling the pin. Delay of millisecond is added in between low and
high to meet the setup and hold time requirement of the reset.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Reviewed-by: Marek Vasut <marex@denx.de>
---
 common/usb_onboard_hub.c | 41 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/common/usb_onboard_hub.c b/common/usb_onboard_hub.c
index 68a04ac041..43f4cee40b 100644
--- a/common/usb_onboard_hub.c
+++ b/common/usb_onboard_hub.c
@@ -7,14 +7,50 @@ 
  * Mostly inspired by Linux kernel v6.1 onboard_usb_hub driver
  */
 
+#include <asm/gpio.h>
 #include <dm.h>
 #include <dm/device_compat.h>
+#include <linux/delay.h>
 #include <power/regulator.h>
 
 struct onboard_hub {
 	struct udevice *vdd;
+	struct gpio_desc *reset_gpio;
 };
 
+struct onboard_hub_data {
+	unsigned long reset_us;
+	unsigned long power_on_delay_us;
+};
+
+int usb_onboard_hub_reset(struct udevice *dev)
+{
+	struct onboard_hub_data *data =
+		(struct onboard_hub_data *)dev_get_driver_data(dev);
+	struct onboard_hub *hub = dev_get_priv(dev);
+	int ret;
+
+	hub->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_IS_OUT);
+
+	/* property is optional, don't return error! */
+	if (!hub->reset_gpio)
+		return 0;
+
+	ret = dm_gpio_set_value(hub->reset_gpio, 1);
+	if (ret)
+		return ret;
+
+	udelay(data->reset_us);
+
+	ret = dm_gpio_set_value(hub->reset_gpio, 0);
+	if (ret)
+		return ret;
+
+	udelay(data->power_on_delay_us);
+
+	return 0;
+}
+
 static int usb_onboard_hub_probe(struct udevice *dev)
 {
 	struct onboard_hub *hub = dev_get_priv(dev);
@@ -30,7 +66,7 @@  static int usb_onboard_hub_probe(struct udevice *dev)
 	if (ret)
 		dev_err(dev, "can't enable vdd-supply: %d\n", ret);
 
-	return ret;
+	return usb_onboard_hub_reset(dev);
 }
 
 static int usb_onboard_hub_remove(struct udevice *dev)
@@ -38,6 +74,9 @@  static int usb_onboard_hub_remove(struct udevice *dev)
 	struct onboard_hub *hub = dev_get_priv(dev);
 	int ret;
 
+	if (hub->reset_gpio)
+		dm_gpio_free(hub->reset_gpio->dev, hub->reset_gpio);
+
 	ret = regulator_set_enable_if_allowed(hub->vdd, false);
 	if (ret)
 		dev_err(dev, "can't disable vdd-supply: %d\n", ret);