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leds: gpio: Support the "panic-indicator" firmware property 

Calling a GPIO LEDs is quite likely to work even if the kernel
has paniced, so they are ideal to blink in this situation.
This commit adds support for the new "panic-indicator"
firmware property, allowing to mark a given LED to blink on
a kernel panic.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
This commit is contained in:
Ezequiel Garcia 2016-04-28 19:03:40 -03:00 committed by Jacek Anaszewski
parent e4f4f7091e
commit 80d6737b27
3 changed files with 7 additions and 0 deletions
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2
Documentation/devicetree/bindings/leds/leds-gpio.txt
View File

@ -23,6 +23,8 @@ LED sub-node properties:
property is not present. property is not present.
- retain-state-suspended: (optional) The suspend state can be retained.Such - retain-state-suspended: (optional) The suspend state can be retained.Such
as charge-led gpio. as charge-led gpio.
- panic-indicator : (optional)
see Documentation/devicetree/bindings/leds/common.txt
Examples: Examples:

4
drivers/leds/leds-gpio.c
View File

@ -127,6 +127,8 @@ static int create_gpio_led(const struct gpio_led *template,
led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
if (!template->retain_state_suspended) if (!template->retain_state_suspended)
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
if (template->panic_indicator)
led_dat->cdev.flags |= LED_PANIC_INDICATOR;
ret = gpiod_direction_output(led_dat->gpiod, state); ret = gpiod_direction_output(led_dat->gpiod, state);
if (ret < 0) if (ret < 0)
@ -200,6 +202,8 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
if (fwnode_property_present(child, "retain-state-suspended")) if (fwnode_property_present(child, "retain-state-suspended"))
led.retain_state_suspended = 1; led.retain_state_suspended = 1;
if (fwnode_property_present(child, "panic-indicator"))
led.panic_indicator = 1;
ret = create_gpio_led(&led, &priv->leds[priv->num_leds], ret = create_gpio_led(&led, &priv->leds[priv->num_leds],
dev, NULL); dev, NULL);

1
include/linux/leds.h
View File

@ -365,6 +365,7 @@ struct gpio_led {
unsigned gpio; unsigned gpio;
unsigned active_low : 1; unsigned active_low : 1;
unsigned retain_state_suspended : 1; unsigned retain_state_suspended : 1;
unsigned panic_indicator : 1;
unsigned default_state : 2; unsigned default_state : 2;
/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
struct gpio_desc *gpiod; struct gpio_desc *gpiod;