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

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Date:   Wed, 15 Mar 2023 15:29:55 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...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 3/15/23 2:55 AM, Konrad Dybcio wrote:
> 
> 
> 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.

Ok.

>> +#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.

As per the available documentation there are no qrb specific quirks as 
of now, but let me add a qcom,qrb4210 for future compatibility.

>> +
>> +	aliases {
>> +		serial0 = &uart4;
>> +	};
>> +
> [...]
> 
>> +&xo_board {
>> +	clock-frequency = <19200000>;
>> +};
>> +
>> +&sleep_clk {
>> +	clock-frequency = <32000>;
>> +};
> Out of alphanumerical order

Ok.

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

Ok.

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

Ok.

> [...]
> 
>> +&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.

Yes, these are reserved / not-connected gpios as per latest version of 
the board schematics.

>> +
>> +&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

Ok.

>> +	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

Ok. Will send updated v2 soon.

Thanks.