On Wed, Feb 13, 2019 at 02:56:17PM +0530, Yash Shah wrote:
> DT documentation for PWM controller added.
>
> Signed-off-by: Wesley W. Terpstra <wes...@sifive.com>
> [Atish: Compatible string update]
> Signed-off-by: Atish Patra <atish.pa...@wdc.com>
> Signed-off-by: Yash Shah <yash.s...@sifive.com>
> ---
> .../devicetree/bindings/pwm/pwm-sifive.txt | 30
> ++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sifive.txt
>
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-sifive.txt
> b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt
> new file mode 100644
> index 0000000..3b9c64c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt
> @@ -0,0 +1,30 @@
> +SiFive PWM controller
> +
> +Unlike most other PWM controllers, the SiFive PWM controller currently only
> +supports one period for all channels in the PWM. All PWMs need to run at
> +the same period. The period also has significant restrictions on the values
> +it can achieve, which the driver rounds to the nearest achievable period.
> +PWM RTL that corresponds to the IP block version numbers can be found
> +here:
> +
> +https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm
> +
> +Required properties:
> +- compatible: Should be "sifive,$socname-pwm" and "sifive,pwmX".
> + Please refer to sifive-blocks-ip-versioning.txt for details.
Please specify what soc and IP version are used. Is sifive,pwm10 valid?
> +- reg: physical base address and length of the controller's registers
> +- clocks: Should contain a clock identifier for the PWM's parent clock.
> +- #pwm-cells: Should be 3. See pwm.txt in this directory
> + for a description of the cell format.
> +- interrupts: one interrupt per PWM channel
> +
> +Examples:
> +
> +pwm: pwm@10020000 {
> + compatible = "sifive,fu540-c000-pwm", "sifive,pwm0";
> + reg = <0x0 0x10020000 0x0 0x1000>;
> + clocks = <&tlclk>;
> + interrupt-parent = <&plic>;
> + interrupts = <42 43 44 45>;
> + #pwm-cells = <3>;
> +};
> --
> 1.9.1
>
