Pull MMC updates from Ulf Hansson:
 "MMC core:
   - Introduce a host helper function to share re-tuning progress

  MMC host:
   - sdhci: Add support for v4 host mode
   - sdhci-of-arasan: Add Support for AM654 MMC and PHY
   - sdhci-sprd: Add support for Spreadtrum's host controller
   - sdhci-tegra: Add support for HS400 enhanced strobe
   - sdhci-tegra: Enable UHS/HS200 modes for Tegra186/210
   - sdhci-tegra: Add support for HS400 delay line calibration
   - sdhci-tegra: Add support for pad calibration
   - sdhci-of-dwcmshc: Address 128MB DMA boundary limitation
   - sdhci-of-esdhc: Add support for tuning erratum A008171
   - sdhci-iproc: Add ACPI support
   - mediatek: Add support for MT8183
   - mediatek: Improve the support for tuning
   - mediatek: Add bus clock control for MT2712
   - jz4740: Add support for the JZ4725B
   - mmci: Add support for the stm32 sdmmc variant
   - mmci: Add support for an optional reset control
   - mmci: Add some new variant specific properties/callbacks
   - mmci: Re-structure DMA code to prepare for new variants
   - renesas_sdhi: Add support for r8a77470, r8a7744 and r8a774a1
   - renesas_sdhi_internal_dmac: Whitelist r8a77970 and r8a774a1
   - tmio/uniphier-sd: Add new UniPhier SD/eMMC controller driver
   - tmio/renesas_sdhi: Deal properly with SCC detection during re-tune
   - tmio/renesas_sdhi: Refactor/consolidate clock management
   - omap_hsmmc: Drop cover detection and some unused platform data
   - dw_mmc-exynos: Enable tuning for more speed modes
   - sunxi: Clarify the new timing mode and enable it for the A64 controller
   - various: Convert to slot GPIO descriptors"

* tag 'mmc-v4.20' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (129 commits)
  mmc: mediatek: drop too much code of tuning method
  mmc: mediatek: add MT8183 MMC driver support
  mmc: mediatek: tune CMD/DATA together
  mmc: mediatek: fix cannot receive new request when msdc_cmd_is_ready fail
  mmc: mediatek: fill the actual clock for mmc debugfs
  mmc: dt-bindings: add support for MT8183 SoC
  mmc: uniphier-sd: avoid using broken DMA RX channel
  mmc: uniphier-sd: fix DMA disabling
  mmc: tmio: simplify the DMA mode test
  mmc: tmio: remove TMIO_MMC_HAVE_HIGH_REG flag
  mmc: tmio: move MFD variant reset to a platform hook
  mmc: renesas_sdhi: Add r8a77470 SDHI1 support
  dt-bindings: mmc: renesas_sdhi: Add r8a77470 support
  mmc: mmci: add stm32 sdmmc variant
  dt-bindings: mmci: add stm32 sdmmc variant
  mmc: mmci: add stm32 sdmmc registers
  mmc: mmci: add clock divider for stm32 sdmmc
  mmc: mmci: add optional reset property
  dt-bindings: mmci: add optional reset property
  mmc: mmci: add variant property to not read datacnt
  ...