Add level shifter support for qualcomm SOC's.

- Changed from v5
    - As suggested by Krzysztof Kozlowski reintroduced minimum/maximum
    in dt bindings and avoid repeating constraints in free form
    text.
    - As suggested by Krzysztof Kozlowski/Konrad Dybcio update commit
    message reflecting discussions and previous disagreements.

- Changed from v4
    - As suggested by Krzysztof Kozlowski Renamed the property from
    `max-sd-hs-frequency` to `max-sd-hs-hz` for clarity.
    - As suggested by Krzysztof Kozlowski remove min/max constraints
    and add default: 50000000 in dt-bindings.
    - As suggested by Konrad Dybcio moved max-sd-hs-hz property in the
    SoC dtsi.
    - Retained sdhci-caps-mask in sm8550.dtsi for now and will revisit
    its removal for future targets after thorough validation and testing
    from the beginning.

- Changed from v3
    - As suggested by Krzysztof Kozlowski moved the property from the
    SoC-level DTS to the board-level DTS.
    - Revised the commit messages to clearly explain its board-specific.

- Changed from v2
    - As suggested by Konrad Dybcio and Ulf Hansson redesigned logic
      to introduce a new DT property max-sd-hs-frequency and override
      the hs_max_dtr accordingly in sd.c file.

- Changed from v1
    - As suggested by Krzysztof Kozlowski redesigned logic to use
    compatible property for adding this level shifter support.
    - Addressed Adrian Hunter comments on V1 with resepect to
      checkpatch.
    - Cleared the bits first and then set bits in
      sdhci_msm_execute_tuning as suggested by Adrian Hunter.
    - Upated the if condition logic in msm_set_clock_rate_for_bus_mode
      as suggested by Adrian Hunter.

Sarthak Garg (4):
  mmc: sdhci-msm: Enable tuning for SDR50 mode for SD card
  dt-bindings: mmc: controller: Add max-sd-hs-hz property
  mmc: core: Introduce a new flag max-sd-hs-hz
  arm64: dts: qcom: sm8550: Limit max SD HS mode frequency by default

 .../bindings/mmc/mmc-controller-common.yaml       |  8 ++++++++
 arch/arm64/boot/dts/qcom/sm8550.dtsi              |  1 +
 drivers/mmc/core/host.c                           |  2 ++
 drivers/mmc/core/sd.c                             |  2 +-
 drivers/mmc/host/sdhci-msm.c                      | 15 +++++++++++++++
 include/linux/mmc/host.h                          |  1 +
 6 files changed, 28 insertions(+), 1 deletion(-)

-- 
2.34.1

On Mon, 8 Sept 2025 at 12:41, Sarthak Garg <quic_sartgarg@quicinc.com> wrote:
>
> Add level shifter support for qualcomm SOC's.
>
> - Changed from v5
>     - As suggested by Krzysztof Kozlowski reintroduced minimum/maximum
>     in dt bindings and avoid repeating constraints in free form
>     text.
>     - As suggested by Krzysztof Kozlowski/Konrad Dybcio update commit
>     message reflecting discussions and previous disagreements.
>
> - Changed from v4
>     - As suggested by Krzysztof Kozlowski Renamed the property from
>     `max-sd-hs-frequency` to `max-sd-hs-hz` for clarity.
>     - As suggested by Krzysztof Kozlowski remove min/max constraints
>     and add default: 50000000 in dt-bindings.
>     - As suggested by Konrad Dybcio moved max-sd-hs-hz property in the
>     SoC dtsi.
>     - Retained sdhci-caps-mask in sm8550.dtsi for now and will revisit
>     its removal for future targets after thorough validation and testing
>     from the beginning.
>
> - Changed from v3
>     - As suggested by Krzysztof Kozlowski moved the property from the
>     SoC-level DTS to the board-level DTS.
>     - Revised the commit messages to clearly explain its board-specific.
>
> - Changed from v2
>     - As suggested by Konrad Dybcio and Ulf Hansson redesigned logic
>       to introduce a new DT property max-sd-hs-frequency and override
>       the hs_max_dtr accordingly in sd.c file.
>
> - Changed from v1
>     - As suggested by Krzysztof Kozlowski redesigned logic to use
>     compatible property for adding this level shifter support.
>     - Addressed Adrian Hunter comments on V1 with resepect to
>       checkpatch.
>     - Cleared the bits first and then set bits in
>       sdhci_msm_execute_tuning as suggested by Adrian Hunter.
>     - Upated the if condition logic in msm_set_clock_rate_for_bus_mode
>       as suggested by Adrian Hunter.
>
> Sarthak Garg (4):
>   mmc: sdhci-msm: Enable tuning for SDR50 mode for SD card
>   dt-bindings: mmc: controller: Add max-sd-hs-hz property
>   mmc: core: Introduce a new flag max-sd-hs-hz
>   arm64: dts: qcom: sm8550: Limit max SD HS mode frequency by default
>
>  .../bindings/mmc/mmc-controller-common.yaml       |  8 ++++++++
>  arch/arm64/boot/dts/qcom/sm8550.dtsi              |  1 +
>  drivers/mmc/core/host.c                           |  2 ++
>  drivers/mmc/core/sd.c                             |  2 +-
>  drivers/mmc/host/sdhci-msm.c                      | 15 +++++++++++++++
>  include/linux/mmc/host.h                          |  1 +
>  6 files changed, 28 insertions(+), 1 deletion(-)
>
> --
> 2.34.1
>

Patch 1 -> 3, applied for next, thanks!

Note that, I took the liberty of amending patch3 to change the
declaration of "max_sd_hs_hz" to an u32, rather than an unsigned int.

Kind regards
Uffe

On Mon, 08 Sep 2025 16:11:18 +0530, Sarthak Garg wrote:
> Add level shifter support for qualcomm SOC's.
> 
> - Changed from v5
>     - As suggested by Krzysztof Kozlowski reintroduced minimum/maximum
>     in dt bindings and avoid repeating constraints in free form
>     text.
>     - As suggested by Krzysztof Kozlowski/Konrad Dybcio update commit
>     message reflecting discussions and previous disagreements.
> 
> [...]

Applied, thanks!

[4/4] arm64: dts: qcom: sm8550: Limit max SD HS mode frequency by default
      commit: c3398456f6f6121e79f6c3d9bff00076cf7a3521

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>