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
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