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arm64: dts: s32g2: Disable support for SD/eMMC UHS mode

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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@oss.nxp.com>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Ciprian Marian Costea 2024-08-30 14:33:47 +03:00 committed by Shawn Guo
parent f241340dca
commit f58b884f8c
2 changed files with 10 additions and 0 deletions
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1
arch/arm64/boot/dts/freescale/s32g274a-evb.dts
View File

@ -39,5 +39,6 @@ &usdhc0 {
pinctrl-1 = <&pinctrl_usdhc0_100mhz>;
pinctrl-2 = <&pinctrl_usdhc0_200mhz>;
disable-wp;
no-1-8-v;
status = "okay";
};

9
arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
View File

@ -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";
};