linux-kernel - Re: [PATCH 5/8] arm64: dts: qcom: ipq5332: Add clocks for USB Super-Speed

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Date:   Sat, 30 Sep 2023 20:25:21 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Praveenkumar I <quic_ipkumar@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org, vkoul@...nel.org,
        kishon@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        gregkh@...uxfoundation.org, catalin.marinas@....com,
        will@...nel.org, p.zabel@...gutronix.de, geert+renesas@...der.be,
        arnd@...db.de, neil.armstrong@...aro.org, nfraprado@...labora.com,
        u-kumar1@...com, peng.fan@....com, quic_wcheng@...cinc.com,
        quic_varada@...cinc.com, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     quic_kathirav@...cinc.com, quic_nsekar@...cinc.com,
        quic_srichara@...cinc.com
Subject: Re: [PATCH 5/8] arm64: dts: qcom: ipq5332: Add clocks for USB
 Super-Speed

On 29/09/2023 11:42, Praveenkumar I wrote:
> Add aux and lfps clocks in USB node for Super-Speed support.
> 
> Signed-off-by: Praveenkumar I <quic_ipkumar@...cinc.com>
> ---
>   arch/arm64/boot/dts/qcom/ipq5332.dtsi | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq5332.dtsi b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> index b08ffd8c094e..1813b9fa4bb5 100644
> --- a/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> @@ -336,11 +336,16 @@ usb: usb@...8800 {
>   			clocks = <&gcc GCC_USB0_MASTER_CLK>,
>   				 <&gcc GCC_SNOC_USB_CLK>,
>   				 <&gcc GCC_USB0_SLEEP_CLK>,
> -				 <&gcc GCC_USB0_MOCK_UTMI_CLK>;
> +				 <&gcc GCC_USB0_MOCK_UTMI_CLK>,
> +				 <&gcc GCC_USB0_AUX_CLK>,
> +				 <&gcc GCC_USB0_LFPS_CLK>;

This looks like a strange change. Usually the DTB is considered to be 
the ABI, so older DTBs should continue to work with newer kernels. Is 
there a reason why the AUX and LFPS clocks were not a part of the 
original submission?

> +
>   			clock-names = "core",
>   				      "iface",
>   				      "sleep",
> -				      "mock_utmi";
> +				      "mock_utmi",
> +				      "aux",
> +				      "lfps";
>   
>   			resets = <&gcc GCC_USB_BCR>;
>   

-- 
With best wishes
Dmitry