linux-kernel - Re: [PATCH v3 4/6] arm64: dts: qcom: ipq5332: Add USB related nodes

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Message-ID: <ddd97ecd-bf4b-85c8-1f0b-8ca175799076@linaro.org>
Date:   Tue, 11 Jul 2023 11:01:03 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Varadarajan Narayanan <quic_varada@...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, arnd@...db.de,
        geert+renesas@...der.be, neil.armstrong@...aro.org,
        nfraprado@...labora.com, broonie@...nel.org, rafal@...ecki.pl,
        quic_srichara@...cinc.com, quic_varada@...cinc.org,
        quic_wcheng@...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
Subject: Re: [PATCH v3 4/6] arm64: dts: qcom: ipq5332: Add USB related nodes

On 11/07/2023 10:51, Varadarajan Narayanan wrote:
> Add USB phy and controller nodes.
> 
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> ---
> v1:
> 	Rename phy node

I don't see any improvements.

> 	Change compatible from m31,ipq5332-usb-hsphy -> qcom,ipq5332-usb-hsphy
> 	Remove 'qscratch' from phy node
> 	Fix alignment and upper-case hex no.s
> 	Add clock definition for the phy
> 	Remove snps,ref-clock-period-ns as it is not used. dwc3_ref_clk_period()
> 	in dwc3/core.c takes the frequency from ref clock and calculates fladj
> 	as appropriate.
> ---
>  arch/arm64/boot/dts/qcom/ipq5332.dtsi | 54 +++++++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq5332.dtsi b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> index 8bfc2db..c945ff6 100644
> --- a/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq5332.dtsi
> @@ -405,6 +405,60 @@
>  				status = "disabled";
>  			};
>  		};
> +
> +		usbphy0: ipq5332-hsphy@...00 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

"phy"



> +			compatible = "qcom,ipq5332-usb-hsphy";
> +			reg = <0x0007b000 0x12c>;
> +
> +			clocks = <&gcc GCC_USB0_PHY_CFG_AHB_CLK>;
> +			clock-names = "cfg_ahb";
> +
> +			resets = <&gcc GCC_QUSB2_0_PHY_BCR>;
> +
> +			status = "disabled";
> +		};
> +
> +		usb2: usb2@...0000 {

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst or
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
for instructions).

> +			compatible = "qcom,ipq5332-dwc3", "qcom,dwc3";
> +

No need for blank line.

> +			reg = <0x08af8800 0x400>;
> +
> +			interrupts = <GIC_SPI 62 IRQ_


Best regards,
Krzysztof