Add level shifter support for qualcomm SOC's.

- 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-frequency property
  mmc: core: Introduce a new flag max-sd-hs-frequency
  arm64: dts: qcom: sm8550: Remove SDR104/SDR50 broken capabilities

 .../bindings/mmc/mmc-controller-common.yaml       | 10 ++++++++++
 arch/arm64/boot/dts/qcom/sm8550.dtsi              |  4 +---
 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, 30 insertions(+), 4 deletions(-)

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2.34.1