watchdog: mtx-1: Convert to use GPIO descriptor

This converts the MTX-1 driver to grab a GPIO descriptor
associated with the device instead of using a resource with
a global GPIO number. Augment the driver and the boardfile.

Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Cc: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Paul Burton <paul.burton@mips.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

2 files changed, 18 insertions, 19 deletions

diff --git a/arch/mips/alchemy/board-mtx1.c b/arch/mips/alchemy/board-mtx1.c
index d625e6f99ae7..9d9d4ee31605 100644
--- a/arch/mips/alchemy/board-mtx1.c
+++ b/arch/mips/alchemy/board-mtx1.c
@@ -24,6 +24,7 @@
 #include <linux/platform_device.h>
 #include <linux/leds.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/gpio_keys.h>
 #include <linux/input.h>
 #include <linux/mtd/partitions.h>
@@ -130,20 +131,18 @@ static struct platform_device mtx1_button = {
         }
 };
 
-static struct resource mtx1_wdt_res[] = {
-        [0] = {
-                .start  = 215,
-                .end    = 215,
-                .name   = "mtx1-wdt-gpio",
-                .flags  = IORESOURCE_IRQ,
-        }
+static struct gpiod_lookup_table mtx1_wdt_gpio_table = {
+        .dev_id = "mtx1-wdt.0",
+        .table = {
+                /* Global number 215 is offset 15 on Alchemy GPIO 2 */
+                GPIO_LOOKUP("alchemy-gpio2", 15, NULL, GPIO_ACTIVE_HIGH),
+                { },
+        },
 };
 
 static struct platform_device mtx1_wdt = {
         .name = "mtx1-wdt",
         .id = 0,
-        .num_resources = ARRAY_SIZE(mtx1_wdt_res),
-        .resource = mtx1_wdt_res,
 };
 
 static const struct gpio_led default_leds[] = {
@@ -310,6 +309,7 @@ static int __init mtx1_register_devices(void)
         }
         gpio_direction_input(mtx1_gpio_button[0].gpio);
 out:
+        gpiod_add_lookup_table(&mtx1_wdt_gpio_table);
         return platform_add_devices(mtx1_devs, ARRAY_SIZE(mtx1_devs));
 }
 arch_initcall(mtx1_register_devices);
diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
index 1fa7d2b32494..e028e0a2eca0 100644
--- a/drivers/watchdog/mtx-1_wdt.c
+++ b/drivers/watchdog/mtx-1_wdt.c
@@ -39,7 +39,7 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 
 #include <asm/mach-au1x00/au1000.h>
 
@@ -55,7 +55,7 @@ static struct {
         int queue;
         int default_ticks;
         unsigned long inuse;
-        unsigned gpio;
+        struct gpio_desc *gpiod;
         unsigned int gstate;
 } mtx1_wdt_device;
 
@@ -67,7 +67,7 @@ static void mtx1_wdt_trigger(struct timer_list *unused)
 
         /* toggle wdt gpio */
         mtx1_wdt_device.gstate = !mtx1_wdt_device.gstate;
-        gpio_set_value(mtx1_wdt_device.gpio, mtx1_wdt_device.gstate);
+        gpiod_set_value(mtx1_wdt_device.gpiod, mtx1_wdt_device.gstate);
 
         if (mtx1_wdt_device.queue && ticks)
                 mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
@@ -90,7 +90,7 @@ static void mtx1_wdt_start(void)
         if (!mtx1_wdt_device.queue) {
                 mtx1_wdt_device.queue = 1;
                 mtx1_wdt_device.gstate = 1;
-                gpio_set_value(mtx1_wdt_device.gpio, 1);
+                gpiod_set_value(mtx1_wdt_device.gpiod, 1);
                 mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
         }
         mtx1_wdt_device.running++;
@@ -105,7 +105,7 @@ static int mtx1_wdt_stop(void)
         if (mtx1_wdt_device.queue) {
                 mtx1_wdt_device.queue = 0;
                 mtx1_wdt_device.gstate = 0;
-                gpio_set_value(mtx1_wdt_device.gpio, 0);
+                gpiod_set_value(mtx1_wdt_device.gpiod, 0);
         }
         ticks = mtx1_wdt_device.default_ticks;
         spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
@@ -198,12 +198,11 @@ static int mtx1_wdt_probe(struct platform_device *pdev)
 {
         int ret;
 
-        mtx1_wdt_device.gpio = pdev->resource[0].start;
-        ret = devm_gpio_request_one(&pdev->dev, mtx1_wdt_device.gpio,
-                                GPIOF_OUT_INIT_HIGH, "mtx1-wdt");
-        if (ret < 0) {
+        mtx1_wdt_device.gpiod = devm_gpiod_get(&pdev->dev,
+                                               NULL, GPIOD_OUT_HIGH);
+        if (IS_ERR(mtx1_wdt_device.gpiod)) {
                 dev_err(&pdev->dev, "failed to request gpio");
-                return ret;
+                return PTR_ERR(mtx1_wdt_device.gpiod);
         }
 
         spin_lock_init(&mtx1_wdt_device.lock);