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watchdog: mtx-1: Convert to use GPIO descriptor

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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>
This commit is contained in:
Linus Walleij 2018-12-22 11:12:31 +01:00 committed by Wim Van Sebroeck
parent 22ec9bb1cb
commit d2b911db8b
2 changed files with 18 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
arch/mips/alchemy/board-mtx1.c
View File

@ -24,6 +24,7 @@
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/leds.h> #include <linux/leds.h>
#include <linux/gpio.h> #include <linux/gpio.h>
#include <linux/gpio/machine.h>
#include <linux/gpio_keys.h> #include <linux/gpio_keys.h>
#include <linux/input.h> #include <linux/input.h>
#include <linux/mtd/partitions.h> #include <linux/mtd/partitions.h>
@ -130,20 +131,18 @@ static struct platform_device mtx1_button = {
} }
}; };
static struct resource mtx1_wdt_res[] = { static struct gpiod_lookup_table mtx1_wdt_gpio_table = {
[0] = { .dev_id = "mtx1-wdt.0",
.start = 215, .table = {
.end = 215, /* Global number 215 is offset 15 on Alchemy GPIO 2 */
.name = "mtx1-wdt-gpio", GPIO_LOOKUP("alchemy-gpio2", 15, NULL, GPIO_ACTIVE_HIGH),
.flags = IORESOURCE_IRQ, { },
} },
}; };
static struct platform_device mtx1_wdt = { static struct platform_device mtx1_wdt = {
.name = "mtx1-wdt", .name = "mtx1-wdt",
.id = 0, .id = 0,
.num_resources = ARRAY_SIZE(mtx1_wdt_res),
.resource = mtx1_wdt_res,
}; };
static const struct gpio_led default_leds[] = { 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); gpio_direction_input(mtx1_gpio_button[0].gpio);
out: out:
gpiod_add_lookup_table(&mtx1_wdt_gpio_table);
return platform_add_devices(mtx1_devs, ARRAY_SIZE(mtx1_devs)); return platform_add_devices(mtx1_devs, ARRAY_SIZE(mtx1_devs));
} }
arch_initcall(mtx1_register_devices); arch_initcall(mtx1_register_devices);

19
drivers/watchdog/mtx-1_wdt.c
View File

@ -39,7 +39,7 @@
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <linux/gpio.h> #include <linux/gpio/consumer.h>
#include <asm/mach-au1x00/au1000.h> #include <asm/mach-au1x00/au1000.h>
@ -55,7 +55,7 @@ static struct {
int queue; int queue;
int default_ticks; int default_ticks;
unsigned long inuse; unsigned long inuse;
unsigned gpio; struct gpio_desc *gpiod;
unsigned int gstate; unsigned int gstate;
} mtx1_wdt_device; } mtx1_wdt_device;
@ -67,7 +67,7 @@ static void mtx1_wdt_trigger(struct timer_list *unused)
/* toggle wdt gpio */ /* toggle wdt gpio */
mtx1_wdt_device.gstate = !mtx1_wdt_device.gstate; 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) if (mtx1_wdt_device.queue && ticks)
mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL); 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) { if (!mtx1_wdt_device.queue) {
mtx1_wdt_device.queue = 1; mtx1_wdt_device.queue = 1;
mtx1_wdt_device.gstate = 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); mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
} }
mtx1_wdt_device.running++; mtx1_wdt_device.running++;
@ -105,7 +105,7 @@ static int mtx1_wdt_stop(void)
if (mtx1_wdt_device.queue) { if (mtx1_wdt_device.queue) {
mtx1_wdt_device.queue = 0; mtx1_wdt_device.queue = 0;
mtx1_wdt_device.gstate = 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; ticks = mtx1_wdt_device.default_ticks;
spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags); spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
@ -198,12 +198,11 @@ static int mtx1_wdt_probe(struct platform_device *pdev)
{ {
int ret; int ret;
mtx1_wdt_device.gpio = pdev->resource[0].start; mtx1_wdt_device.gpiod = devm_gpiod_get(&pdev->dev,
ret = devm_gpio_request_one(&pdev->dev, mtx1_wdt_device.gpio, NULL, GPIOD_OUT_HIGH);
GPIOF_OUT_INIT_HIGH, "mtx1-wdt"); if (IS_ERR(mtx1_wdt_device.gpiod)) {
if (ret < 0) {
dev_err(&pdev->dev, "failed to request gpio"); dev_err(&pdev->dev, "failed to request gpio");
return ret; return PTR_ERR(mtx1_wdt_device.gpiod);
} }
spin_lock_init(&mtx1_wdt_device.lock); spin_lock_init(&mtx1_wdt_device.lock);