linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: pm8350c: Add pwm support

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Date:   Tue, 7 Sep 2021 11:16:49 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     satya priya <skakit@...eaurora.org>
Cc:     Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        swboyd@...omium.org, kgunda@...eaurora.org,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: qcom: pm8350c: Add pwm support

On Mon, Sep 06, 2021 at 04:11:07PM +0530, satya priya wrote:
> Add pwm support for PM8350C pmic.
> 
> Signed-off-by: satya priya <skakit@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/pm8350c.dtsi | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/pm8350c.dtsi b/arch/arm64/boot/dts/qcom/pm8350c.dtsi
> index e1b75ae..ecdae55 100644
> --- a/arch/arm64/boot/dts/qcom/pm8350c.dtsi
> +++ b/arch/arm64/boot/dts/qcom/pm8350c.dtsi
> @@ -29,6 +29,12 @@
>  			interrupt-controller;
>  			#interrupt-cells = <2>;
>  		};
> +
> +		pm8350c_pwm4: pwm {

What does the '4' represent, an internal channel number? It should
probably be omitted if the PM8350 only has a single output PWM
port.

> +			compatible = "qcom,pm8350c-pwm";
> +			#pwm-cells = <2>;
> +			status = "okay";

I don't think it should be enabled by default, there may be boards with
the PM8350C that don't use the PWM.