linux-kernel - Re: [PATCH 2/2] remoteproc: qcom_q6v5_wcss: use optional reset for wcss_q6_bcr

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Message-ID: <47f6bed6-4d21-4e11-ade5-b3314d026502@gmail.com>
Date: Mon, 1 Dec 2025 15:04:42 -0600
From: mr.nuke.me@...il.com
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>, andersson@...nel.org,
 mathieu.poirier@...aro.org, linux-arm-msm@...r.kernel.org,
 linux-remoteproc@...r.kernel.org, Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] remoteproc: qcom_q6v5_wcss: use optional reset for
 wcss_q6_bcr_reset

On 12/1/25 5:21 AM, Konrad Dybcio wrote:
> On 11/29/25 2:32 AM, Alexandru Gagniuc wrote:
>> The "wcss_q6_bcr_reset" is not used on IPQ8074, and IPQ6018. Use
>> devm_reset_control_get_optional_exclusive() for this reset so that
>> probe() does not fail on platforms where it is not used.
>>
>> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
>> ---
> 
> This reset is not even used (or documented anywhere).. the closest
> I can find is "wcss_q6_reset" in qcom,q6v5.txt, initially documented
> in:
> 
> Fixes: 3a3d4163e0bf ("remoteproc: qcom: Introduce Hexagon V5 based WCSS driver")
> 
> which claims it was made for.. IPQ8074
> 
> Peeking at the GCC driver, this reset is most likely present as
> GCC_WCSS_Q6_BCR

The downstream kernel uses GCC_WCSS_Q6_BCR for ipq8074 [1] and ipq6018 [2].
They only use of ->wcss_q6_bcr_reset in the QCN404 path, which does not use
->wcss_q6_reset. So maybe we can get away with calling it "wcss_q6_reset",
store the pointer in ->wcss_q6_reset, and drop '.wcss_q6_reset_required'

Which path do you think is the most appropriate?

Alex

[1] https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.5.r5/arch/arm64/boot/dts/qcom/ipq8074.dtsi?ref_type=heads#L1060
[2] https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.5.r5/arch/arm64/boot/dts/qcom/ipq6018.dtsi?ref_type=heads#L1440
[3] https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.5.r5/drivers/remoteproc/qcom_q6v5_wcss.c#L967