[PATCH] arm64: dts: rockchip: fix eMMC reset polarity on PX30 Ringneck

[Quentin Schulz]

From: Quentin Schulz <quentin.schulz@xxxxxxxxx>

According to the Jedec 5.1 specification, the device is held in reset
when RST_n is low, therefore the polarity of the line must be that, as
specified in the Device Tree binding (mmc/mmc-pwrseq-emmc.yaml).

Due to the wrong polarity, eMMC devices with RST_n_FUNCTION[162]
bitfield [1:0] set to 0x1 (the default is 0x0) will be held in reset
forever.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: c484cf93f61b ("arm64: dts: rockchip: add PX30-µQ7 (Ringneck) SoM with Haikou baseboard")
Signed-off-by: Quentin Schulz <quentin.schulz@xxxxxxxxx>
---
PX30 Ringneck is affected by the same issue that Cobra and PP-1516 have
and for which patches[1][2] have already been sent.

Out of the other boards I own, RK3588 Tiger and Jaguar also have an
inverted polarity but I tried making the eMMC chip care about the reset
line polarity to no avail, therefore I'm not changing them until we
figure out a setup in which we can reproduce the issue.

There are a handful of other Rockchip boards with an inverted polarity
but I don't own any of them so I will not change them either.

[1] https://lore.kernel.org/linux-rockchip/20260609081728.30616-2-jakobunt@xxxxxxxxx/
[2] https://lore.kernel.org/linux-rockchip/20260612-pp1516-emmc-polarity-v1-1-4816c1c909f7@xxxxxxxxx/
---
 arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi b/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi
index 973b4c5880e24..29794216592d8 100644
--- a/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi
+++ b/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi
@@ -26,7 +26,7 @@ emmc_pwrseq: emmc-pwrseq {
 		compatible = "mmc-pwrseq-emmc";
 		pinctrl-0 = <&emmc_reset>;
 		pinctrl-names = "default";
-		reset-gpios = <&gpio1 RK_PB3 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio1 RK_PB3 GPIO_ACTIVE_LOW>;
 	};
 
 	leds {

---
base-commit: 4edcdefd4083ae04b1a5656f4be6cd83ae919ef4
change-id: 20260626-ringneck-emmc-polarity-717003c6b802

Best regards,
--  
Quentin Schulz <quentin.schulz@xxxxxxxxx>