linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: Add base qrb4210-rb2 board dts

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Date:   Mon, 10 Apr 2023 22:23:37 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        agross@...nel.org, linux-kernel@...r.kernel.org,
        bhupesh.linux@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski@...aro.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: Add base qrb4210-rb2 board dts



On 3/16/23 5:22 AM, Konrad Dybcio wrote:
> 
> 
> On 15.03.2023 23:36, Bjorn Andersson wrote:
>> On Thu, Mar 16, 2023 at 02:31:45AM +0530, 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>
>>> ---
> [...]
> 
>>> +	vmmc-supply = <&vreg_l24a_2p96>;
>>
>> Is there any reason why this platform doesn't require the vmmc supply to
>> be driven to HPM? This has traditionally been coming back biting us
>> through some stability issues later.
> Do we even support HPM/LPM on SMD RPM?

I couldn't find any relevant documentation to say the same (HPM/LPM 
support on SMD RPM?).
So, I would suggest that we stick to the approach used in this patch for 
now.

@Bjorn, please let me know in case of any concerns.

Thanks,
Bhupesh