Commit 5c03465e authored by Lad Prabhakar's avatar Lad Prabhakar Committed by Geert Uytterhoeven
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arm64: dts: renesas: rzv2-evk-cn15-sd: Add ramp delay for SD0 regulator 



Set an appropriate ramp delay for the SD0 I/O voltage regulator in the
CN15 SD overlay to make UHS-I voltage switching reliable during card
initialization.

This issue was observed on the RZ/V2H EVK, while the same UHS-I cards
worked on the RZ/V2N EVK without problems. Adding the ramp delay makes
the behavior consistent and avoids SD init timeouts.

Before this change SD0 could fail with:

    mmc0: error -110 whilst initialising SD card

With the delay in place UHS-I cards enumerate correctly:

    mmc0: new UHS-I speed SDR104 SDXC card at address aaaa
    mmcblk0: mmc0:aaaa SR64G 59.5 GiB
     mmcblk0: p1

Fixes: 3d6c2bc7 ("arm64: dts: renesas: Add CN15 eMMC and SD overlays for RZ/V2H and RZ/V2N EVKs")
Signed-off-by: default avatarLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260123225957.1007089-5-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
parent bb70589b

arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ vqmmc_sdhi0: regulator-vqmmc-sdhi0 { 
		regulator-max-microvolt = <3300000>;

		gpios-states = <0>;

		states = <3300000 0>, <1800000 1>;

		regulator-ramp-delay = <60>;

	};

};