linux-kernel - Re: [PATCH v3 02/14] Documentation: dt/bindings: Document pinctrl-gpio

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Message-ID: <20170130203312.xsvu6rk2sz66m43a@rob-hp-laptop>
Date:   Mon, 30 Jan 2017 14:33:12 -0600
From:   Rob Herring <robh@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Burton <paul.burton@...tec.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        james.hogan@...tec.com
Subject: Re: [PATCH v3 02/14] Documentation: dt/bindings: Document
 pinctrl-gpio

On Wed, Jan 25, 2017 at 07:51:55PM +0100, Paul Cercueil wrote:
> This commit adds documentation for the devicetree bidings of the

s/biding/bindings/

> pinctrl-gpio driver, which handles GPIOs of the Ingenic SoCs
> currently supported by the Linux kernel.

The subject makes no reference that this binding is for Ingenic GPIO. 
Also, drop the "Documentation: " part. It's redundant.

> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  .../devicetree/bindings/gpio/ingenic,gpio.txt      | 45 ++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> 
> v2: New patch
> v3: No changes
> 
> diff --git a/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt b/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> new file mode 100644
> index 000000000000..b2eb20494365
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> @@ -0,0 +1,45 @@
> +Ingenic jz47xx GPIO controller
> +
> +Required properties:
> +  - compatible:
> +    - "ingenic,jz4740-gpio" for the JZ4740 SoC
> +    - "ingenic,jz4780-gpio" for the JZ4780 SoC
> +
> +  - reg: Base address and length of each memory resource used by the GPIO
> +    controller hardware module.
> +
> +  - gpio-controller: Marks the device node as a GPIO controller.
> +  - #gpio-cells: Should be 2. The first cell is the GPIO number and the second
> +    cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>. Only the
> +    GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
> +  - gpio-ranges: Range of pins managed by the GPIO controller.
> +
> +Optional properties:
> +  - base: The GPIO number to use as the base for this driver.

Drop this please. This is a Linuxism.

> +  - interrupt-controller: Marks the device node as an interrupt controller.
> +  - interrupts: Interrupt specifier for the controllers interrupt.
> +    Required if 'interrupt-controller' is specified.

Some h/w doesn't have interrupt capability? If not, this should not be 
optional.

> +
> +Please refer to gpio.txt in this directory for details of gpio-ranges property
> +and the common GPIO bindings used by client devices.
> +
> +The GPIO controller also acts as an interrupt controller. It uses the default
> +two cells specifier as described in Documentation/devicetree/bindings/
> +interrupt-controller/interrupts.txt.

Just document #interrupt-cells and its value and drop this paragraph.

> +
> +Example:
> +
> +gpa: gpio-controller@...10000 {
> +	compatible = "ingenic,jz4740-gpio";
> +	reg = <0x10010000 0x100>;
> +
> +	gpio-controller;
> +	gpio-ranges = <&pinctrl 0 0 32>;
> +	#gpio-cells = <2>;
> +
> +	interrupt-controller;
> +	#interrupt-cells = <2>;
> +
> +	interrupt-parent = <&intc>;
> +	interrupts = <28>;
> +};
> -- 
> 2.11.0
>