[PATCH v3 0/7] Add SD/MMC driver for Actions Semi S900 SoC

[Manivannan Sadhasivam]

Hello,

This patchset adds SD/MMC driver for Actions Semi S900 SoC from Owl
family SoCs. There are 4 SD/MMC controller present in this SoC but
only 2 are enabled currently for Bubblegum96 board to access uSD and
onboard eMMC. SDIO support for this driver is not currently implemented.

Note: Currently, driver uses 2 completion mechanisms for maintaining
the coherency between SDC and DMA interrupts and I know that it is not
efficient. Hence, I'd like to hear any suggestions for reimplementing
the logic if anyone has.

With this driver, this patchset also fixes one clk driver issue and enables
the Actions Semi platform in ARM64 defconfig.

Thanks,
Mani

Changes in v3:

* Incorporated a review comment from Andreas on board dts patch
* Modified the MAINTAINERS entry for devicetree YAML binding

Changes in v2:

* Converted the devicetree bindings to YAML
* Misc changes to bubblegum devicetree as per the review from Andreas
* Dropped the read/write wrappers and renamed all functions to use owl-
  prefix as per the review from Ulf
* Renamed clk_val_best to owl_clk_val_best and added Reviewed-by tag
  from Stephen

Manivannan Sadhasivam (7):
  clk: actions: Fix factor clk struct member access
  dt-bindings: mmc: Add Actions Semi SD/MMC/SDIO controller binding
  arm64: dts: actions: Add MMC controller support for S900
  arm64: dts: actions: Add uSD and eMMC support for Bubblegum96
  mmc: Add Actions Semi Owl SoCs SD/MMC driver
  MAINTAINERS: Add entry for Actions Semi SD/MMC driver and binding
  arm64: configs: Enable Actions Semi platform in defconfig

 .../devicetree/bindings/mmc/owl-mmc.yaml      |  62 ++
 MAINTAINERS                                   |   2 +
 .../boot/dts/actions/s900-bubblegum-96.dts    |  62 ++
 arch/arm64/boot/dts/actions/s900.dtsi         |  45 ++
 arch/arm64/configs/defconfig                  |   1 +
 drivers/clk/actions/owl-factor.c              |   7 +-
 drivers/mmc/host/Kconfig                      |   8 +
 drivers/mmc/host/Makefile                     |   1 +
 drivers/mmc/host/owl-mmc.c                    | 696 ++++++++++++++++++
 9 files changed, 880 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mmc/owl-mmc.yaml
 create mode 100644 drivers/mmc/host/owl-mmc.c

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2.17.1