Re: [PATCH 00/10] riscv: spacemit: enable SD card support with UHS modes for OrangePi RV2

[Michael Opdenacker <michael.opdenacker@rootcommit.com>]

Hi Iker,

Thanks a lot for these patches!

On 3/2/26 4:13 PM, Iker Pedrosa wrote:
> This series enables complete SD card support for the Spacemit K1-based
> OrangePi RV2 board, including UHS (Ultra High Speed) modes for
> high-performance SD card operation.
>
> Background
>
> The Spacemit K1 SoC includes an SDHCI controller capable of supporting
> SD cards up to UHS-I speeds (SDR104 at 208MHz). However, mainline
> currently lacks basic SD controller configuration, SDHCI driver
> enhancements for voltage switching and tuning, and power management
> infrastructure.
>
> Implementation
>
> The series enables SD card support through coordinated layers:
>
> - Hardware infrastructure (patches 1-2): Device tree bindings for voltage
> switching hardware and essential clock infrastructure.
> - SDHCI driver enhancements (patches 3-7): Regulator framework
> integration, pinctrl state switching for voltage domains, AIB register
> programming, and comprehensive SDR tuning support for reliable UHS
> operation.
> - SoC and board integration (patches 8-10): Complete K1 SoC controller
> definitions, PMIC power infrastructure, and OrangePi RV2 board enablement
> with full UHS support.
>
> This transforms the OrangePi RV2 from having no SD card support to full
> UHS-I capability, enabling high-performance storage up to 208MHz.
>
> Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com>
> ---
> Iker Pedrosa (10):
>        dt-bindings: mmc: spacemit,sdhci: add AIB voltage switching registers
>        mmc: sdhci-of-k1: enable essential clock infrastructure for SD operation
>        mmc: sdhci-of-k1: add regulator framework support
>        mmc: sdhci-of-k1: add pinctrl state switching for voltage changes
>        mmc: sdhci-of-k1: add AIB register support for voltage switching
>        mmc: sdhci-of-k1: add SDR tuning infrastructure
>        mmc: sdhci-of-k1: add comprehensive SDR tuning support
>        riscv: dts: spacemit: k1: add SD card controller and pinctrl support
>        riscv: dts: spacemit: k1-orangepi-rv2: add PMIC and power infrastructure
>        riscv: dts: spacemit: k1-orangepi-rv2: add SD card support with UHS modes
>
>   .../devicetree/bindings/mmc/spacemit,sdhci.yaml    |  15 +
>   arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts   |  69 +++++
>   arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi       |  40 +++
>   arch/riscv/boot/dts/spacemit/k1.dtsi               |  13 +
>   drivers/mmc/host/sdhci-of-k1.c                     | 320 +++++++++++++++++++++
>   5 files changed, 457 insertions(+)
> ---
> base-commit: 5f499bb7a07fcdcf8877acaa8f413a5dc1fcfacc
> change-id: 20260226-orangepi-sd-card-uhs-0ecb05839b0c
>
> Best regards,

Things look all right according to my first tests. First time I'm able 
to boot a Yocto build root filesystem from SD card with the mainline 
kernel on the OrangePi RV2 board!
Tomorrow, I should have time to run tests on BananaPi PF3 too. Fingers 
crossed for eMMC support...

I'll be happy to test your further iterations. That would be awesone to 
have SD support merged in 7.1 :)
Thanks again
Michael.

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