[PATCH RFC 0/2] soc: spacemit: add sdhci support to K1 SoC

[Yixun Lan]

Add support for the SD/eMMC Host Controller found in SpacemiT K1 SoC,
The controller supports data transmission of MMC, SDIO, and SD protocol.

The SD/eMMC Host Controller has the following features:
- MMC/eMMC 5.1 specification compliant
- Supports PIO mode and SDMA mode data transfer
- Supports ADMA1 and ADMA 2 (64-bit addressing) data transfer
- Supports 1-bit/4-bit SD memory and SDIO
- Supports 1-bit/8-bit MMC and CE-ATA cards
- SPI mode supported for eMMC card
Full docs can be found at SpacemiT's developer web, chapter 10.4 SD/eMMC [1]

In this patch series, only MMC part has been implemented and tested.
This driver also requires clock support which currently isn't in mainline [2].

There is a WIP branch at SpacemiT's repo for people who interested [3].

I've marked this patch series as RFC, due to incomplete clock and SD/SDIO support.

Link: https://developer.spacemit.com/documentation?token=WZNvwFDkYinYx0k9jzPcMK5WnIe [1]
Link: https://lore.kernel.org/all/20250103215636.19967-2-heylenay@4d2.org/ [2]
Link: https://github.com/spacemit-com/linux/tree/k1/wip-sdhci [3]

Signed-off-by: Yixun Lan <dlan at gentoo.org>
---
Yixun Lan (2):
      dt-bindings: mmc: spacemit,sdhci: add support for K1 SoC
      mmc: sdhci-of-k1: add support for SpacemiT K1 SoC

 .../devicetree/bindings/mmc/spacemit,sdhci.yaml    |  53 ++++
 drivers/mmc/host/Kconfig                           |  14 +
 drivers/mmc/host/Makefile                          |   1 +
 drivers/mmc/host/sdhci-of-k1.c                     | 320 +++++++++++++++++++++
 4 files changed, 388 insertions(+)
---
base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b
change-id: 20250212-20-k1-sdhci-76a4901030db

Best regards,
-- 
Yixun Lan