linux-kernel - Re: [PATCH v1 4/4] leds: no longer use unnamed gpios

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Date:	Wed, 7 Jan 2015 15:55:22 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Olliver Schinagl <oliver+list@...inagl.nl>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Olliver Schinagl <oliver@...inagl.nl>,
	Robin Gong <b38343@...escale.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Aaron Lu <aaron.lu@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Grant Likely <grant.likely@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Alexander Shiyan <shc_work@...l.ru>,
	Jingoo Han <jg1.han@...sung.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-input@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v1 4/4] leds: no longer use unnamed gpios

On Wed, Jan 07, 2015 at 10:08:42AM +0100, Olliver Schinagl wrote:
> From: Olliver Schinagl <oliver@...inagl.nl>
> 
> The gpio document says we should not use unnamed bindings for gpios.
> This patch uses the 'led-' prefix to the gpios and updates code and
> documents. Because the devm_get_gpiod_from_child() falls back to using
> old-style unnamed gpios, we can update the code first, and update
> dts files as time allows.
> 
> Signed-off-by: Olliver Schinagl <oliver@...inagl.nl>
> ---
>  Documentation/devicetree/bindings/leds/leds-gpio.txt | 12 ++++++------
>  drivers/leds/leds-gpio.c                             |  2 +-
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-gpio.txt b/Documentation/devicetree/bindings/leds/leds-gpio.txt
> index d544cf1..2c138cc 100644
> --- a/Documentation/devicetree/bindings/leds/leds-gpio.txt
> +++ b/Documentation/devicetree/bindings/leds/leds-gpio.txt
> @@ -7,7 +7,7 @@ Each LED is represented as a sub-node of the gpio-leds device.  Each
>  node's name represents the name of the corresponding LED.
>  
>  LED sub-node properties:
> -- gpios :  Should specify the LED's GPIO, see "gpios property" in
> +- led-gpios :  Should specify the LED's GPIO, see "gpios property" in
>    Documentation/devicetree/bindings/gpio/gpio.txt.  Active low LEDs should be
>    indicated using flags in the GPIO specifier.
>  - label :  (optional)
> @@ -32,12 +32,12 @@ leds {
>  	compatible = "gpio-leds";
>  	hdd {
>  		label = "IDE Activity";
> -		gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>;
> +		led-gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>;
>  		linux,default-trigger = "ide-disk";
>  	};
>  
>  	fault {
> -		gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
> +		led-gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
>  		/* Keep LED on if BIOS detected hardware fault */
>  		default-state = "keep";
>  	};
> @@ -46,11 +46,11 @@ leds {
>  run-control {
>  	compatible = "gpio-leds";
>  	red {
> -		gpios = <&mpc8572 6 GPIO_ACTIVE_HIHG>;
> +		led-gpios = <&mpc8572 6 GPIO_ACTIVE_HIHG>;
>  		default-state = "off";
>  	};
>  	green {
> -		gpios = <&mpc8572 7 GPIO_ACTIVE_HIGH>;
> +		led-gpios = <&mpc8572 7 GPIO_ACTIVE_HIGH>;
>  		default-state = "on";
>  	};
>  };
> @@ -59,7 +59,7 @@ leds {
>  	compatible = "gpio-leds";
>  
>  	charger-led {
> -		gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
> +		led-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
>  		linux,default-trigger = "max8903-charger-charging";
>  		retain-state-suspended;
>  	};
> diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
> index 8e5af69..5b7bc84 100644
> --- a/drivers/leds/leds-gpio.c
> +++ b/drivers/leds/leds-gpio.c
> @@ -184,7 +184,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
>  		struct gpio_led led = {};
>  		const char *state = NULL;
>  
> -		led.gpiod = devm_get_gpiod_from_child(dev, NULL, child);
> +		led.gpiod = devm_get_gpiod_from_child(dev, "led", child);

Would not this break existing boards using old bindings? You need to
handle both cases: if you can't located "led-gpios" then you will have to
try just "gpios".

Thanks.

-- 
Dmitry
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