From e4f4f7091ee6d085c4a84b4023a61483d71bc777 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Thu, 28 Apr 2016 19:03:39 -0300 Subject: devicetree: leds: Introduce "panic-indicator" optional property It's desirable to specify which LEDs are to be blinked on a kernel panic. Therefore, introduce a devicetree boolean property to mark which LEDs should be treated this way, if possible. Signed-off-by: Ezequiel Garcia Reviewed-by: Matthias Brugger Acked-by: Rob Herring Acked-by: Pavel Machek Signed-off-by: Jacek Anaszewski --- Documentation/devicetree/bindings/leds/common.txt | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation/devicetree') diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt index 68419843e32f..af10678ea2f6 100644 --- a/Documentation/devicetree/bindings/leds/common.txt +++ b/Documentation/devicetree/bindings/leds/common.txt @@ -37,6 +37,9 @@ Optional properties for child nodes: property is mandatory for the LEDs in the non-flash modes (e.g. torch or indicator). +- panic-indicator : This property specifies that the LED should be used, + if at all possible, as a panic indicator. + Required properties for flash LED child nodes: - flash-max-microamp : Maximum flash LED supply current in microamperes. - flash-max-timeout-us : Maximum timeout in microseconds after which the flash -- cgit v1.2.3 From 80d6737b27bbdf645a815c136606836b435f0268 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Thu, 28 Apr 2016 19:03:40 -0300 Subject: 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 Reviewed-by: Matthias Brugger Acked-by: Pavel Machek Signed-off-by: Jacek Anaszewski --- Documentation/devicetree/bindings/leds/leds-gpio.txt | 2 ++ drivers/leds/leds-gpio.c | 4 ++++ include/linux/leds.h | 1 + 3 files changed, 7 insertions(+) (limited to 'Documentation/devicetree') diff --git a/Documentation/devicetree/bindings/leds/leds-gpio.txt b/Documentation/devicetree/bindings/leds/leds-gpio.txt index fea1ebfe24a9..cbbeb1850910 100644 --- a/Documentation/devicetree/bindings/leds/leds-gpio.txt +++ b/Documentation/devicetree/bindings/leds/leds-gpio.txt @@ -23,6 +23,8 @@ LED sub-node properties: property is not present. - retain-state-suspended: (optional) The suspend state can be retained.Such as charge-led gpio. +- panic-indicator : (optional) + see Documentation/devicetree/bindings/leds/common.txt Examples: diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c index 61143f55597e..8229f063b483 100644 --- a/drivers/leds/leds-gpio.c +++ b/drivers/leds/leds-gpio.c @@ -127,6 +127,8 @@ static int create_gpio_led(const struct gpio_led *template, led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; if (!template->retain_state_suspended) 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); 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")) 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], dev, NULL); diff --git a/include/linux/leds.h b/include/linux/leds.h index 7e9fb00e15e8..d2b13066e781 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -365,6 +365,7 @@ struct gpio_led { unsigned gpio; unsigned active_low : 1; unsigned retain_state_suspended : 1; + unsigned panic_indicator : 1; unsigned default_state : 2; /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ struct gpio_desc *gpiod; -- cgit v1.2.3