colin/u-boot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

rockchip: rk3399-nanopi-4: Allow MMC driver to control SD regulators

Browse Source 
This change removes the "regulator-always-on" property from the
"vcc3v0_sd" (vmmc-supply) and "vcc_sdio" (vqmmc-supply) regulators,
which otherwise prevents the MMC driver from being able to power cycle
the SD card as part of the initialization procedure.

It also removes the "regulator-boot-on" from the "vcc_sdio" regulator,
which could theoretically damage a SD card that is already initialized
in a low voltage mode.

Signed-off-by: Justin Klaassen <justin@tidylabs.net>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Justin Klaassen
2025-05-23 16:53:40 +00:00
committed by Kever Yang
parent f8f865ec0b
commit 2abd7fff9e
1 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
View File

@@ -19,8 +19,11 @@
&vcc3v0_sd {
bootph-pre-ram;
/delete-property/ regulator-always-on;
};
&vcc_sdio {
/delete-property/ regulator-always-on;
/delete-property/ regulator-boot-on;
regulator-init-microvolt = <3000000>;
};