[PATCH] watchdog: wm831x: Use GPIO descriptor

[Linus Walleij <linus.walleij@linaro.org>]

The WM831x watchdog driver passes a global GPIO number from
platform data into this driver, this is discouraged so pass
a GPIO descriptor instead.

More thorough approaches are possible passing descriptors
associated with the device through machine descriptor tables,
but no boardfiles in the kernel currently use this driver
so it is hard to test.

Cc: Richard Fitzgerald <rf@opensource.cirrus.com>
Cc: Charles Keepax <ckeepax@opensource.cirrus.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/watchdog/wm831x_wdt.c    | 23 ++++++-----------------
 include/linux/mfd/wm831x/pdata.h |  3 ++-
 2 files changed, 8 insertions(+), 18 deletions(-)

diff --git a/drivers/watchdog/wm831x_wdt.c b/drivers/watchdog/wm831x_wdt.c
index 116c2f47b463..998a39f83c48 100644
--- a/drivers/watchdog/wm831x_wdt.c
+++ b/drivers/watchdog/wm831x_wdt.c
@@ -13,7 +13,7 @@
 #include <linux/platform_device.h>
 #include <linux/watchdog.h>
 #include <linux/uaccess.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 
 #include <linux/mfd/wm831x/core.h>
 #include <linux/mfd/wm831x/pdata.h>
@@ -29,7 +29,7 @@ struct wm831x_wdt_drvdata {
 	struct watchdog_device wdt;
 	struct wm831x *wm831x;
 	struct mutex lock;
-	int update_gpio;
+	struct gpio_desc *update_gpiod;
 	int update_state;
 };
 
@@ -103,8 +103,8 @@ static int wm831x_wdt_ping(struct watchdog_device *wdt_dev)
 
 	mutex_lock(&driver_data->lock);
 
-	if (driver_data->update_gpio) {
-		gpio_set_value_cansleep(driver_data->update_gpio,
+	if (driver_data->update_gpiod) {
+		gpiod_set_value_cansleep(driver_data->update_gpiod,
 					driver_data->update_state);
 		driver_data->update_state = !driver_data->update_state;
 		ret = 0;
@@ -239,19 +239,8 @@ static int wm831x_wdt_probe(struct platform_device *pdev)
 		reg |= pdata->secondary << WM831X_WDOG_SECACT_SHIFT;
 		reg |= pdata->software << WM831X_WDOG_RST_SRC_SHIFT;
 
-		if (pdata->update_gpio) {
-			ret = devm_gpio_request_one(&pdev->dev,
-						pdata->update_gpio,
-						GPIOF_OUT_INIT_LOW,
-						"Watchdog update");
-			if (ret < 0) {
-				dev_err(wm831x->dev,
-					"Failed to request update GPIO: %d\n",
-					ret);
-				return ret;
-			}
-
-			driver_data->update_gpio = pdata->update_gpio;
+		if (pdata->update_gpiod) {
+			driver_data->update_gpiod = pdata->update_gpiod;
 
 			/* Make sure the watchdog takes hardware updates */
 			reg |= WM831X_WDOG_RST_SRC;
diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index dcc9631b3052..ea7e9ad10a14 100644
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -15,6 +15,7 @@
 #ifndef __MFD_WM831X_PDATA_H__
 #define __MFD_WM831X_PDATA_H__
 
+struct gpio_desc;
 struct wm831x;
 struct regulator_init_data;
 
@@ -95,7 +96,7 @@ enum wm831x_watchdog_action {
 
 struct wm831x_watchdog_pdata {
 	enum wm831x_watchdog_action primary, secondary;
-	int update_gpio;
+	struct gpio_desc *update_gpiod;
 	unsigned int software:1;
 };
 
-- 
2.19.2