linux-kernel - Re: [PATCH] arm64: dts: qcom: ipq9574: Use assigned-clock-rates for QUP I2C core clks

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Date:   Thu, 15 Jun 2023 10:51:30 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Devi Priya <quic_devipriy@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     quic_srichara@...cinc.com, quic_sjaganat@...cinc.com,
        quic_kathirav@...cinc.com, quic_anusha@...cinc.com
Subject: Re: [PATCH] arm64: dts: qcom: ipq9574: Use assigned-clock-rates for
 QUP I2C core clks

On 15.06.2023 10:48, Devi Priya wrote:
> Use assigned-clock-rates property for configuring the QUP I2C core clocks
> to operate at nominal frequency.
> 
> Signed-off-by: Devi Priya <quic_devipriy@...cinc.com>
> ---
There's probably some logic behind this, and it almost sounds like
it'd be fitting to introduce an OPP table for I2C hosts, especially
given the voltage requirements.

Konrad
>  arch/arm64/boot/dts/qcom/ipq9574.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> index 0baeb10bbdae..78bf7f9c455a 100644
> --- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> @@ -361,6 +361,8 @@
>  			clocks = <&gcc GCC_BLSP1_QUP2_I2C_APPS_CLK>,
>  				 <&gcc GCC_BLSP1_AHB_CLK>;
>  			clock-names = "core", "iface";
> +			assigned-clocks = <&gcc GCC_BLSP1_QUP2_I2C_APPS_CLK>;
> +			assigned-clock-rates = <50000000>;
>  			dmas = <&blsp_dma 14>, <&blsp_dma 15>;
>  			dma-names = "tx", "rx";
>  			status = "disabled";
> @@ -389,6 +391,8 @@
>  			clocks = <&gcc GCC_BLSP1_QUP3_I2C_APPS_CLK>,
>  				 <&gcc GCC_BLSP1_AHB_CLK>;
>  			clock-names = "core", "iface";
> +			assigned-clocks = <&gcc GCC_BLSP1_QUP3_I2C_APPS_CLK>;
> +			assigned-clock-rates = <50000000>;
>  			dmas = <&blsp_dma 16>, <&blsp_dma 17>;
>  			dma-names = "tx", "rx";
>  			status = "disabled";
> @@ -417,6 +421,8 @@
>  			clocks = <&gcc GCC_BLSP1_QUP4_I2C_APPS_CLK>,
>  				 <&gcc GCC_BLSP1_AHB_CLK>;
>  			clock-names = "core", "iface";
> +			assigned-clocks = <&gcc GCC_BLSP1_QUP4_I2C_APPS_CLK>;
> +			assigned-clock-rates = <50000000>;
>  			dmas = <&blsp_dma 18>, <&blsp_dma 19>;
>  			dma-names = "tx", "rx";
>  			status = "disabled";
> @@ -446,6 +452,8 @@
>  			clocks = <&gcc GCC_BLSP1_QUP5_I2C_APPS_CLK>,
>  				 <&gcc GCC_BLSP1_AHB_CLK>;
>  			clock-names = "core", "iface";
> +			assigned-clocks = <&gcc GCC_BLSP1_QUP5_I2C_APPS_CLK>;
> +			assigned-clock-rates = <50000000>;
>  			dmas = <&blsp_dma 20>, <&blsp_dma 21>;
>  			dma-names = "tx", "rx";
>  			status = "disabled";