linux-kernel - Re: [PATCH 9/9] clk: qcom: gcc-msm8994: Add a quirk for a different SDCC configuration

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Date:   Wed, 24 Mar 2021 11:11:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] clk: qcom: gcc-msm8994: Add a quirk for a different
 SDCC configuration

On Sat, Mar 13, 2021 at 03:19:18AM +0100, Konrad Dybcio wrote:
> Some devices come with a different SDCC clock configuration,
> account for that.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
>  .../bindings/clock/qcom,gcc-msm8994.yaml         |  4 ++++
>  drivers/clk/qcom/gcc-msm8994.c                   | 16 ++++++++++++++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc-msm8994.yaml b/Documentation/devicetree/bindings/clock/qcom,gcc-msm8994.yaml
> index f8067fb1bbd6..9db0800a4ee4 100644
> --- a/Documentation/devicetree/bindings/clock/qcom,gcc-msm8994.yaml
> +++ b/Documentation/devicetree/bindings/clock/qcom,gcc-msm8994.yaml
> @@ -49,6 +49,10 @@ properties:
>      description:
>        Protected clock specifier list as per common clock binding.
>  
> +  qcom,sdcc2-clk-src-40mhz:
> +    description: SDCC2_APPS clock source runs at 40MHz.
> +    type: boolean

Why don't you have some input clock you can get the rate from?

> +
>  required:
>    - compatible
>    - reg