linux-kernel - Re: [PATCH v3 1/6] Documentation: ARM: sunxi: pwm: add Allwinner sun8i.

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Date:   Thu, 20 Dec 2018 18:50:09 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Hao Zhang <hao5781286@...il.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...tlin.com, wens@...e.org, mturquette@...libre.com,
        sboyd@...nel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pwm@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 1/6] Documentation: ARM: sunxi: pwm: add Allwinner
 sun8i.

On Mon, Nov 26, 2018 at 12:18:59AM +0800, Hao Zhang wrote:
> This patch adds Allwinner sun8i pwm binding document.
> 
> Signed-off-by: Hao Zhang <hao5781286@...il.com>
> ---
>  .../devicetree/bindings/pwm/pwm-sun8i.txt          | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
> 
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt b/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
> new file mode 100644
> index 0000000..7531d85
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
> @@ -0,0 +1,24 @@
> +Allwinner sun8i R40/V40/T3 SoC PWM controller
> +
> +Required properties:
> +  - compatible: Should be one of:
> +    - "allwinner,sun8i-r40-pwm"
> +  - reg: Physical base address and length of the controller's registers
> +  - interrupts: Should contain interrupt.
> +  - clocks: From common clock binding, handle to the parent clock.
> +  - clock-names: Must contain the clock names described just above.
> +  - pwm-channels: PWM channels of the controller.

Why do you need this? In the cover letter you say:

	"The sun8i R40/T3/V40 PWM has 8 PWM channals ..."

Why does this need to be specified in the DT?

Thierry

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