linux-kernel - Re: [PATCH v4 02/14] dt/bindings: Document gpio-ingenic

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Date:   Tue, 4 Apr 2017 09:52:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.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>, james.hogan@...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
Subject: Re: [PATCH v4 02/14] dt/bindings: Document gpio-ingenic

On Sun, Apr 02, 2017 at 10:42:32PM +0200, Paul Cercueil wrote:
> This commit adds documentation for the devicetree bindings of the
> gpio-ingenic driver, which handles GPIOs of the Ingenic SoCs
> currently supported by the Linux kernel.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  .../devicetree/bindings/gpio/ingenic,gpio.txt      | 48 ++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> 
>  v2: New patch
>  v3: No changes
>  v4: Update for the v4 version of the gpio-ingenic driver
> 
> diff --git a/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt b/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> new file mode 100644
> index 000000000000..f54af444f7c3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> @@ -0,0 +1,48 @@
> +Ingenic jz47xx GPIO controller
> +
> +That the Ingenic GPIO driver node must be a sub-node of the Ingenic pinctrl
> +driver node.
> +
> +Required properties:
> +--------------------
> +
> + - compatible: Must contain one of:
> +    - "ingenic,jz4740-gpio"
> +    - "ingenic,jz4770-gpio"
> +    - "ingenic,jz4780-gpio"
> +	And one of:
> +	- "ingenic,gpio-bank-a"
> +	- "ingenic,gpio-bank-b"
> +	- "ingenic,gpio-bank-c"
> +	- "ingenic,gpio-bank-d"
> +	- "ingenic,gpio-bank-e" (for SoC version > jz4740)
> +	- "ingenic,gpio-bank-f" (for SoC version > jz4740)

This is quite strange. Why do you need the bank? Doesn't gpio-ranges 
give you that info? Maybe use reg property here instead.

> + - interrupt-controller: Marks the device node as an interrupt controller.
> + - interrupts: Interrupt specifier for the controllers interrupt.
> + - #interrupt-cells: Should be 2. Refer to
> +   ../interrupt-controller/interrupts.txt for more details.
> + - 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. Refer to
> +   'gpio.txt' in this directory for more details.
> +
> +Example:
> +--------
> +
> +&pinctrl {
> +	gpa: gpio-controller@0 {

gpio@...

> +		compatible = "ingenic,gpio-bank-a", "ingenic,jz4740-gpio";
> +
> +		gpio-controller;
> +		gpio-ranges = <&pinctrl 0 0 32>;
> +		#gpio-cells = <2>;
> +
> +		interrupt-controller;
> +		#interrupt-cells = <2>;
> +
> +		interrupt-parent = <&intc>;
> +		interrupts = <28>;
> +	};
> +};
> -- 
> 2.11.0
>