linux-kernel - Re: [Patch v3 2/2] gpio: Document GPIO hogging mechanism

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Date:	Wed, 10 Dec 2014 19:56:17 +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>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Jiri Prchal <jiri.prchal@...ignal.cz>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [Patch v3 2/2] gpio: Document GPIO hogging mechanism

On Fri, Dec 5, 2014 at 6:02 AM, Benoit Parrot <bparrot@...com> wrote:
> Add GPIO hogging documentation to gpio.txt
>
> Signed-off-by: Benoit Parrot <bparrot@...com>
> ---
> Changes since v2:
>  * Updated to the latest hog syntax.
>
> Changes since v1:
>  * Split the devicetree bindings documentation in its own patch.
>
>  Documentation/devicetree/bindings/gpio/gpio.txt | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt
> index 3fb8f53..6d88133 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio.txt
> +++ b/Documentation/devicetree/bindings/gpio/gpio.txt
> @@ -103,6 +103,22 @@ 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).

Since this property will only describe one GPIO, why use the plural
form? Would it not be confusing?

> +- direction: A property specifying the direction/value needed. This property
> +            can take the folowing values: input, output-high, output-low.

nit: since this property not only describes the direction but also the
(potential) value, I suggest to rename it to "state".
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