arm64: dts: renesas: rzt2h-n2h-evk: Add ramp delay for SD0 card regulator

Add a ramp delay of 60 uV/us to the vqmmc_sdhi0 voltage regulator to
fix UHS-I SD card detection failures.

Measurements on CN78 pin 4 showed the actual voltage ramp time to be
21.86ms when switching between 3.3V and 1.8V. A 25ms ramp delay has
been configured to provide adequate margin. The calculation is based
on the voltage delta of 1.5V (3.3V - 1.8V):
  1500000 uV / 60 uV/us = 25000 us (25ms)

Prior to this patch, UHS-I cards failed to initialize with:

    mmc0: error -110 whilst initialising SD card

After this patch, UHS-I cards are properly detected on SD0:

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

Fixes: d065453e5ee09 ("arm64: dts: renesas: rzt2h-rzn2h-evk: Enable SD card slot")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260123225957.1007089-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi b/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi
index 510399febf2956cbcf95ab5ba86bb6a6311165bc..f87c2492f414a45dc378e78f6b341eaa1045fd31 100644 (file)
--- a/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi
@@ -53,6 +53,7 @@
                regulator-max-microvolt = <3300000>;
                gpios-states = <0>;
                states = <3300000 0>, <1800000 1>;
+               regulator-ramp-delay = <60>;
        };
 #endif