Re: [PATCH v1 5/9] arm64: dts: agilex5: add SOCDK eMMC daughter board support

[Krzysztof Kozlowski]

On Mon, May 11, 2026 at 01:21:27PM -0700, Tanmay Kathpalia wrote:
> Add device tree support for the Agilex5 SOCDK board variant with
> eMMC daughter card.
> 
> Update the SoC dtsi with a fixed 1.8V regulator for eMMC I/O voltage.
> 
> Add socfpga_agilex5_socdk_emmc.dts with eMMC controller configured for:
> - 8-bit bus width
> - Non-removable eMMC device
> - High-speed, HS200, and HS400 modes at 1.8V
> - 200MHz maximum frequency with SDHCI clock base capability override
> 
> Signed-off-by: Tanmay Kathpalia <tanmay.kathpalia@xxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/intel/Makefile            |   1 +
>  .../arm64/boot/dts/intel/socfpga_agilex5.dtsi |   8 ++
>  .../dts/intel/socfpga_agilex5_socdk_emmc.dts  | 111 ++++++++++++++++++
>  3 files changed, 120 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/intel/socfpga_agilex5_socdk_emmc.dts
> 
> diff --git a/arch/arm64/boot/dts/intel/Makefile b/arch/arm64/boot/dts/intel/Makefile
> index 33fcc55d0cb9..5bbbcfda1f48 100644
> --- a/arch/arm64/boot/dts/intel/Makefile
> +++ b/arch/arm64/boot/dts/intel/Makefile
> @@ -8,5 +8,6 @@ dtb-$(CONFIG_ARCH_INTEL_SOCFPGA) += socfpga_agilex_n6000.dtb \
>  				socfpga_agilex5_socdk_013b.dtb \
>  				socfpga_agilex5_socdk_modular.dtb \
>  				socfpga_agilex5_socdk_nand.dtb \
> +				socfpga_agilex5_socdk_emmc.dtb \
>  				socfpga_n5x_socdk.dtb
>  dtb-$(CONFIG_ARCH_KEEMBAY) += keembay-evm.dtb
> diff --git a/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi b/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi
> index 7e080f13166f..feb4ccb317a7 100644
> --- a/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi
> +++ b/arch/arm64/boot/dts/intel/socfpga_agilex5.dtsi
> @@ -317,6 +317,14 @@ sd_io_1v8_reg: regulator-1p8v {
>  					<3300000 0x0>;
>  		};
>  
> +		emmc_io_1v8_reg: regulator-fixed-1p8v {

How is this property of a SoC? How SoC itself has a fixed regulator for
EMMC? Really?

Best regards,
Krzysztof