arm64: dts: rockchip: Fix sdmmc access on rk3308-rock-s0 v1.1 boards

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BootROM leave GPIO4_D6 configured as SDMMC_PWREN function and DW MCI
driver set PRWEN high on MMC_POWER_UP and low on MMC_POWER_OFF.
Similarly U-Boot also set PRWEN high before accessing mmc.

However, HW revision prior to v1.2 must pull GPIO4_D6 low to access
sdmmc. For HW revision v1.2 the state of GPIO4_D6 has no impact.

Model an always-on active low fixed regulator using GPIO4_D6 to fix
use of sdmmc on older HW revisions of the board.

Fixes: adeb5d2a4b ("arm64: dts: rockchip: Add Radxa ROCK S0")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Link: https://lore.kernel.org/r/20241119230838.4137130-1-jonas@kwiboo.se
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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Jonas Karlman 2024-11-19 23:08:36 +00:00 • committed by Heiko Stuebner

parent da92d3dfc8

commit 26c100232b

1 changed files with 24 additions and 1 deletions

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arch/arm64/boot/dts/rockchip/rk3308-rock-s0.dts

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