[v3,0/8] Add RZ/G3E SDHI support

The SD/MMC block on the RZ/G3E ("R9A09G047") SoC is similar to that
of the RZ/V2H, but the SD0 channel has only dedicated pins, so we must
use SD_STATUS register to control voltage and power enable (internal
regulator).

For SD1 and SD2 channel we can either use gpio regulator or internal
regulator (using SD_STATUS register) for voltage switching.

For SD0, fixed voltage(eMMC) uses fixed regulator and non-fixed voltage
(SD) uses internal regulator.

v2->v3:
 * Collected tags
 * Renamed internal regulator labels vqmmc_sdhi{0..2}->sdhi{0..2}_vqmmc.
 * Updated regulator phandles on SoM/Board dts.
 * Dropped renaming the gpio regulator label vqmmc_sdhi1->vqmmc_sdhi1_gpio.
 * Renamed node sd0emmc->sd0-emmc
 * Renamed sd0-emmc-{ctrl,data,rst}->sd0-{ctrl,data,rst}
 * Moved header file gpio.h from patch#6 to patch#8.
 * Dropped overriding internal regulator name.
 * Dropped #if guard in pinctrl node for SDHI0
 * Renamed the label/node sdhi0_pins: sd0->sdhi0_usd_pins: sd0-usd.
v1->v2:
 * Collected tags.
 * Documented internal regulator as optional property for both RZ/G3E and
   RZ/V2H SoCs.
 * Updated commit description for regulator used in SD0 fixed and
   non-fixed voltage case in patch#3.
 * As the node enabling of internal regulator is controlled through status,
   added a check for device availability.
 * Status of internal regulator is disabled in the SoC .dtsi. Override
   the status in the board DTS when needed.
 * Added support for enabling SDHI internal regulator in RZ/V2H
 * Added missing header file gpio.h
 * Used fixed regulator for eMMC on SD0 and dropped sd0-iovs pins for
   eMMC.
 * Sorted pinctrl nodes for sd2
 * Enabled internal regulator for SD2.
 * Added support for enabling SD on SDHI0
 * Replaced the regulator usd_vdd_3p3v->reg_3p3v.
 * Renamed the gpio-hog node sd1-pwr-en->sd1-pwr-en-hog.
 * Sorted sd1 pin ctrl nodes.

Biju Das (8):
  dt-bindings: mmc: renesas,sdhi: Document RZ/G3E support
  mmc: renesas_sdhi: Arrange local variables in reverse xmas tree order
  mmc: renesas_sdhi: Add support for RZ/G3E SoC
  arm64: dts: renesas: r9a09g047: Add SDHI0-SDHI2 nodes
  arm64: dts: renesas: r9a09g057: Add support for enabling SDHI internal
    regulator
  arm64: dts: renesas: rzg3e-smarc-som: Enable SDHI{0,2}
  arm64: dts: renesas: rzg3e-smarc-som: Add support for enable SD on
    SDHI0
  arm64: dts: renesas: r9a09g047e57-smarc: Enable SDHI1

 .../devicetree/bindings/mmc/renesas,sdhi.yaml |  16 ++
 arch/arm64/boot/dts/renesas/r9a09g047.dtsi    |  60 +++++++
 .../boot/dts/renesas/r9a09g047e57-smarc.dts   |  49 ++++++
 arch/arm64/boot/dts/renesas/r9a09g057.dtsi    |  21 +++
 .../boot/dts/renesas/renesas-smarc2.dtsi      |  18 ++
 .../boot/dts/renesas/rzg3e-smarc-som.dtsi     | 154 ++++++++++++++++++
 drivers/mmc/host/renesas_sdhi.h               |   1 +
 drivers/mmc/host/renesas_sdhi_core.c          | 136 +++++++++++++++-
 drivers/mmc/host/tmio_mmc.h                   |   5 +
 9 files changed, 459 insertions(+), 1 deletion(-)