linux-kernel - Re: [Patch v2 2/2] gpio: Document GPIO hogging mechanism

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Date:	Fri, 28 Nov 2014 16:31:19 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Benoit Parrot <bparrot@...com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [Patch v2 2/2] gpio: Document GPIO hogging mechanism

On Fri, Nov 21, 2014 at 8:54 AM, Benoit Parrot <bparrot@...com> wrote:
> Add GPIO hogging documentation to gpio.txt
>
> Signed-off-by: Benoit Parrot <bparrot@...com>
> ---
> Changes since v1:
>  * Split the devicetree bindings documentation in its own patch.
>
>  Documentation/devicetree/bindings/gpio/gpio.txt | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt
> index 3fb8f53..82755e2 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio.txt
> +++ b/Documentation/devicetree/bindings/gpio/gpio.txt
> @@ -103,6 +103,24 @@ Every GPIO controller node must contain both an empty "gpio-controller"
>  property, and a #gpio-cells integer property, which indicates the number of
>  cells in a gpio-specifier.
>
> +The GPIO chip may contain GPIO hog definitions. GPIO hogging is a mechanism
> +providing automatic GPIO request and configuration as part of the
> +gpio-controller's driver probe function.
> +
> +Each GPIO hog definition is represented as a child node of the GPIO controller.
> +Required properties:
> +- gpio-hog: a property specifying that this child node represent a gpio-hog.
> +- gpios: store the gpio information (id, flags, ...). Shall contain the
> +  number of cells specified in its parent node (GPIO controller node).
> +- input: a property specifying to set the GPIO direction as input.
> +- output-high: a property specifying to set the GPIO direction to output with
> +  the value high.
> +- output-low: a property specifying to set the GPIO direction to output with
> +  the value low.
> +
> +Optional properties:
> +- line-name: the GPIO label name. If not present the node name is used.
> +
>  Example of two SOC GPIO banks defined as gpio-controller nodes:
>
>         qe_pio_a: gpio-controller@...0 {
> @@ -110,6 +128,13 @@ Example of two SOC GPIO banks defined as gpio-controller nodes:
>                 reg = <0x1400 0x18>;
>                 gpio-controller;
>                 #gpio-cells = <2>;
> +
> +               line_b: line_b {

Mmm what is the label used for? Can this node ever be referenced from
somewhere else?
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