[v6,0/2] Add RZ/G3E SDHI support

Message

Biju Das March 5, 2025, 9:29 a.m. UTC

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.

v5->v6:
 * Added const for renesas_sdhi_vqmmc_regulator.
 * Added Rb tag from Wolfram for driver changes.
v4->v5:
 * Collected tag from Wolfram Sang.
 * Dropped redundant struct renesas_sdhi_vqmmc_regulator initialization.
 * Added one space before '=' in the struct initializer.
v3->v4:
 * Dropped dts patches as it is deferred for queuing.
 * Arranged variables of same types close to each other in probe() and
   dropped patch#2.
 * Added sd_ctrl_read32().
 * Replaced sd_ctrl_read32_rep()->sd_ctrl_read32().
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 (2):
  dt-bindings: mmc: renesas,sdhi: Document RZ/G3E support
  mmc: renesas_sdhi: Add support for RZ/G3E SoC

 .../devicetree/bindings/mmc/renesas,sdhi.yaml |  16 +++
 drivers/mmc/host/renesas_sdhi.h               |   1 +
 drivers/mmc/host/renesas_sdhi_core.c          | 130 ++++++++++++++++++
 drivers/mmc/host/tmio_mmc.h                   |  10 ++
 4 files changed, 157 insertions(+)