On 2025/5/24 00:53, Justin Klaassen wrote:
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 <[email protected]>
Reviewed-by: Kever Yang <[email protected]>
Thanks,
- Kever
---
(no changes since v2)
Changes in v2:
- Added patch to remove device-tree properties that conflicted with MMC driver
initialization
arch/arm/dts/rk3399-nanopi4-u-boot.dtsi | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
b/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
index 75736124996..ba2b73223d4 100644
--- a/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
@@ -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>;
};
