On Tue, Nov 12, 2019 at 12:12:06PM +0000, Yash Shah wrote:
> DT documentation for GPIO controller added.
>
> Signed-off-by: Wesley W. Terpstra <wesley@xxxxxxxxxx>
> [Atish: Compatible string update]
> Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
> Signed-off-by: Yash Shah <yash.shah@xxxxxxxxxx>
> ---
> .../devicetree/bindings/gpio/gpio-sifive.txt | 33 ++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-sifive.txt
Please make this a schema. See
Documentation/devicetree/writing-schema.rst.
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-sifive.txt b/Documentation/devicetree/bindings/gpio/gpio-sifive.txt
> new file mode 100644
> index 0000000..d3416d5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-sifive.txt
> @@ -0,0 +1,33 @@
> +SiFive GPIO controller bindings
> +
> +Required properties:
> +- compatible: Should be "sifive,<chip>-gpio" and "sifive,gpio<version>".
> + Supported compatible strings are: "sifive,fu540-c000-gpio" for the SiFive
> + GPIO v0 as integrated onto the SiFive FU540 chip, and "sifive,gpio0" for the
> + SiFive GPIO v0 IP block with no chip integration tweaks.
> + Please refer to sifive-blocks-ip-versioning.txt for details.
> +- reg: Physical base address and length of the controller's registers.
> +- clocks: Should contain a clock identifier for the GPIO's parent clock.
> +- #gpio-cells : Should be 2
> + - The first cell is the GPIO offset number.
> + - The second cell indicates the polarity of the GPIO
> +- gpio-controller : Marks the device node as a GPIO controller.
> +- interrupt-controller: Marks the device node as an interrupt controller.
> +- #interrupt-cells : Should be 2.
> + - The first cell is the GPIO offset number within the GPIO controller.
> + - The second cell is the edge/level to use for interrupt generation.
> +- interrupts: Specify the interrupts, one per GPIO
How many GPIOs?
> +
> +Example:
> +
> +gpio: gpio@10060000 {
> + compatible = "sifive,fu540-c000-gpio","sifive,gpio0";
space ^
> + interrupt-parent = <&plic>;
> + interrupts = <7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22>;
> + reg = <0x0 0x10060000 0x0 0x1000>;
> + clocks = <&tlclk>;
> + gpio-controller;
> + #gpio-cells = <2>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> +};
> --
> 2.7.4
>
