linux-kernel - Re: [PATCH v2 2/4] soc: qcom: rpmh: Add support to read back resource settings

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Message-ID: <3kngkegljl73a3kmzcprwhkwpjml7rfgiy3hypv3hyvyxe7yg2@ccyzzva2bifj>
Date: Wed, 22 Oct 2025 01:28:58 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Kamal Wadhwa <kamal.wadhwa@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Maulik Shah <maulik.shah@....qualcomm.com>
Subject: Re: [PATCH v2 2/4] soc: qcom: rpmh: Add support to read back
 resource settings

On Wed, Oct 22, 2025 at 02:38:54AM +0530, Kamal Wadhwa wrote:
> From: Maulik Shah <maulik.shah@....qualcomm.com>
> 
> All rpmh_*() APIs so far have supported placing votes for various
> resource settings but the H/W also have option to read resource
> settings.

Is it supported since SDM845?

> 
> This change adds a new rpmh_read() API to allow clients

See Documentation/process/submitting-patches.rst, "This patch ..."

> to read back resource setting from H/W. This will be useful for
> clients like regulators, which currently don't have a way to know
> the settings applied during bootloader stage.
> 
> Link: https://lore.kernel.org/r/20250623-add-rpmh-read-support-v1-1-ae583d260195@oss.qualcomm.com

This is useless, please drop.

> Signed-off-by: Maulik Shah <maulik.shah@....qualcomm.com>
> Signed-off-by: Kamal Wadhwa <kamal.wadhwa@....qualcomm.com>
> ---
>  drivers/soc/qcom/rpmh-rsc.c | 13 +++++++++++--
>  drivers/soc/qcom/rpmh.c     | 47 +++++++++++++++++++++++++++++++++++++++++----
>  include/soc/qcom/rpmh.h     |  5 +++++
>  include/soc/qcom/tcs.h      |  2 ++
>  4 files changed, 61 insertions(+), 6 deletions(-)
> 

-- 
With best wishes
Dmitry