linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: Add base qrb4210-rb2 board dts

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Date:   Tue, 14 Mar 2023 22:25:22 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Cc:     agross@...nel.org, andersson@...nel.org,
        linux-kernel@...r.kernel.org, bhupesh.linux@...il.com,
        robh+dt@...nel.org, krzysztof.kozlowski@...aro.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: Add base qrb4210-rb2 board dts



On 14.03.2023 22:08, Bhupesh Sharma wrote:
> Add DTS for Qualcomm qrb4210-rb2 board which uses SM4250 SoC.
> 
> This adds debug uart, emmc, uSD and tlmm support along with
> regulators found on this board.
> 
> Also defines the 'xo_board' and 'sleep_clk' frequencies for
> this board.
> 
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
[...]

> +#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
This SoC does not feature RPMh, drop.

> +#include "sm4250.dtsi"
> +
> +/ {
> +	model = "Qualcomm Technologies, Inc. QRB4210 RB2";
> +	compatible = "qcom,qrb4210-rb2", "qcom,sm4250";
Please add a qcom,qrb4210 between the board-specific and the common SoC
compatibles so that we can address QRB-specific quirks if such ever arise.

> +
> +	aliases {
> +		serial0 = &uart4;
> +	};
> +
[...]

> +&xo_board {
> +	clock-frequency = <19200000>;
> +};
> +
> +&sleep_clk {
> +	clock-frequency = <32000>;
> +};
Out of alphanumerical order


> +
> +&qupv3_id_0 {
> +	status = "okay";
> +};
> +
> +&uart4 {
> +	status = "okay";
> +};
> +
> +&rpm_requests {
Out of alphanumerical order

> +	regulators-0 {
Will there be more PMICs under this node? If not, drop the -0.

[...]

> +&tlmm {
> +	gpio-reserved-ranges = <37 5>, <43 2>, <47 1>,
> +			       <49 1>, <52 1>, <54 1>,
> +			       <56 3>, <61 2>, <64 1>,
> +			       <68 1>, <72 8>, <96 1>;
> +};
Are there *really* so many? Does the board refuse to boot if
you knock off any of these entries? If so, they probably
don't belong here.


> +
> +&sdhc_1 {
> +	status = "okay";
Status should go last
> +
> +	vmmc-supply = <&vreg_l24a_2p96>; /* emmc power line */
> +	vqmmc-supply = <&vreg_l11a_1p8>; /* emmc vddq */
The comments are not very useful, drop please.

> +	bus-width = <8>;
This is defined in the SoC dtsi already

> +	no-sdio;
> +	non-removable;
> +};
> +
> +&sdhc_2 {
> +	status = "okay";
> +
> +	cd-gpios = <&tlmm 88 GPIO_ACTIVE_HIGH>; /* card detect gpio */
> +	vmmc-supply = <&vreg_l22a_2p96>; /* Card power line */
> +	vqmmc-supply = <&vreg_l5a_2p96>; /* IO line power */
> +	bus-width = <4>;
> +	no-sdio;
> +	no-emmc;
Ditto

Konrad
> +};