On 30/08/2024 13:33, Ciprian Costea wrote:
From: Ciprian Marian Costea <ciprianmarian.costea@xxxxxxxxxxx>
Disable SD/eMMC UHS modes for NXP boards which do not set VCCQ voltage
supply to 1.8V by default, such as S32G274A-EVB and S32G274A-RDB2.
Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@xxxxxxxxxxx>
Reviewed-by: Matthias Brugger <mbrugger@xxxxxxxx>
---
arch/arm64/boot/dts/freescale/s32g274a-evb.dts | 1 +
arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/s32g274a-evb.dts b/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
index 7ab917f547ef..b9a119eea2b7 100644
--- a/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
+++ b/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
@@ -39,5 +39,6 @@ &usdhc0 {
pinctrl-1 = <&pinctrl_usdhc0_100mhz>;
pinctrl-2 = <&pinctrl_usdhc0_200mhz>;
disable-wp;
+ no-1-8-v;
status = "okay";
};
diff --git a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
index 8739f63771bc..aaa61a8ad0da 100644
--- a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
+++ b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
@@ -45,5 +45,14 @@ &usdhc0 {
pinctrl-1 = <&pinctrl_usdhc0_100mhz>;
pinctrl-2 = <&pinctrl_usdhc0_200mhz>;
disable-wp;
+ /* Remove no-1-8-v to enable higher speed modes for SD card.
+ * However, this is not enough to enable HS400 or HS200 modes for eMMC.
+ * In this case, the position of the resistor R797 must be changed
+ * from A to B before removing the property.
+ * If the property is removed without changing the resistor position,
+ * HS*00 may be enabled, but the interface might be unstable because of
+ * the wrong VCCQ voltage applied to the eMMC.
+ */
+ no-1-8-v;
status = "okay";
};
