linux-kernel - Re: [PATCH 3/8] arm64: dts: qcom: ipq5332: Add USB Super-Speed PHY node

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Date:   Tue, 3 Oct 2023 19:58:02 +0530
From:   Praveenkumar I <quic_ipkumar@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        <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 3/8] arm64: dts: qcom: ipq5332: Add USB Super-Speed PHY
 node



On 9/30/2023 10:52 PM, Dmitry Baryshkov wrote:
> On 29/09/2023 11:42, Praveenkumar I wrote:
>> Add USB Super-Speed UNIPHY node and populate the phandle on
>> gcc node for the parent clock map.
>>
>> Signed-off-by: Praveenkumar I <quic_ipkumar@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/ipq5332.dtsi | 25 ++++++++++++++++++++++++-
>>   1 file changed, 24 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq5332.dtsi 
>> b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
>> index d3fef2f80a81..b08ffd8c094e 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq5332.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
>> @@ -158,6 +158,29 @@ usbphy0: phy@...00 {
>>               status = "disabled";
>>           };
>>   +        usbphy1: phy@...000 {
>
> Are there other USB PHYs on this platform?
No. Only two USB PHYs.
>
>> +            compatible = "qcom,ipq5332-usb-uniphy";
>> +            reg = <0x4b0000 0x800>;
>> +
>> +            clocks = <&gcc GCC_PCIE3X1_PHY_AHB_CLK>,
>> +                 <&gcc GCC_USB0_PHY_CFG_AHB_CLK>,
>> +                 <&gcc GCC_USB0_PIPE_CLK>;
>> +            clock-names = "ahb",
>> +                      "cfg_ahb",
>> +                      "pipe";
>> +
>> +            resets =  <&gcc GCC_USB0_PHY_BCR>;
>> +
>> +            #clock-cells = <0>;
>> +            clock-output-names = "usb0_pipe_clk_src";
>
> I'm not sure, what is the best approach her. For QMP USB and PCIe PHYs 
> we had to use fixed names historically. On the other hand for QMP DP 
> clocks we are fine with the generated names. I'd prefer the latter case.
Sure, will use the generated names.
>
>> +
>> +            qcom,phy-usb-mux-sel = <&tcsr 0x10540>;
>> +
>> +            #phy-cells = <0>;
>> +
>> +            status = "disabled";
>> +        };
>> +
>>           qfprom: efuse@...00 {
>>               compatible = "qcom,ipq5332-qfprom", "qcom,qfprom";
>>               reg = <0x000a4000 0x721>;
>> @@ -200,7 +223,7 @@ gcc: clock-controller@...0000 {
>>                    <&sleep_clk>,
>>                    <0>,
>>                    <0>,
>> -                 <0>;
>> +                 <&usbphy1>;
>>           };
>>             tcsr_mutex: hwlock@...5000 {
>
--
Thanks,
Praveenkumar