linux-kernel - Re: [PATCH v2 0/2] soc: qcom: Add support for Qualcomm Modem Processing SubSystem DSM memory

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Message-ID: <301cfc50-5452-7e71-559e-2586f89464d6@linaro.org>
Date:   Tue, 29 Nov 2022 09:28:47 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Bjorn Andersson <andersson@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 0/2] soc: qcom: Add support for Qualcomm Modem
 Processing SubSystem DSM memory

On 18/11/2022 09:53, Neil Armstrong wrote:
> The Qualcomm SM8550 SoC Modem Processing SubSystem requires that a memory
> region named DSM should be shared with the Application Processor SubSystem.
> 
> This adds bindings for this MPSS DSM memory and driver implementation to
> share this memory region with the Modem Processing SubSystem.
> 
> The MPSS DSM memory must be shared between the APPS SubSystem and the MPSS
> SubSystems, for the whole lifetime of the system.
> 
> To: Andy Gross <agross@...nel.org>
> To: Bjorn Andersson <andersson@...nel.org>
> To: Konrad Dybcio <konrad.dybcio@...ainline.org>
> To: Rob Herring <robh+dt@...nel.org>
> To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
> To: Frank Rowand <frowand.list@...il.com>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> 
> ---
> Changes in v2:
> - Fixed the bindings
> - Added some precision on the MPSS DSM in commit messages
> - Link to v1: https://lore.kernel.org/r/20221114-narmstrong-sm8550-upstream-mpss_dsm-v1-0-158dc2bb6e96@linaro.org
> 
> ---
> Neil Armstrong (2):
>        dt-bindings: reserved-memory: document Qualcomm MPSS DSM memory
>        soc: qcom: add MDSS DSM memory driver
> 
>   .../reserved-memory/qcom,mpss-dsm-mem.yaml         | 37 +++++++++
>   drivers/of/platform.c                              |  1 +
>   drivers/soc/qcom/Kconfig                           | 10 +++
>   drivers/soc/qcom/Makefile                          |  1 +
>   drivers/soc/qcom/mpss_dsm_mem.c                    | 95 ++++++++++++++++++++++
>   5 files changed, 144 insertions(+)
> ---
> base-commit: 999e0145579c0e04174044a39257a4d96ee30020
> change-id: 20221114-narmstrong-sm8550-upstream-mpss_dsm-21c438c65f9b
> 
> Best regards,

After discussions on https://lore.kernel.org/all/20221114-narmstrong-sm8550-upstream-mpss_dsm-v1-0-158dc2bb6e96@linaro.org/,
handling of this memory zone will be integrated into the remoteproc PAS changes.

Neil