[PATCH 2/2] arm64: dts: imx8mp-tqma8mpql: remove virtual 3.3V regulator

[Ahmad Fatoum]

Hi Alexander,

On 7/31/25 11:16, Alexander Stein wrote:
> From: Markus Niebel <Markus.Niebel at ew.tq-group.com>
> 
> BUCK4 rail supplies the 3.3V rail. Use the actual regulator
> instead of a virtual fixed regulator.
> 
> Signed-off-by: Markus Niebel <Markus.Niebel at ew.tq-group.com>
> Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>

jfyi, this may impact boot time as it delays eMMC probe until after the
PMIC on the slower I2C bus is registered. It would be cool if we could
annotate regulators as left-on by bootloader somehow to weaken
dependencies, but that's unrelated to your patch.

Cheers,
Ahmad

> ---
>  .../boot/dts/freescale/imx8mp-tqma8mpql.dtsi      | 15 +++------------
>  1 file changed, 3 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql.dtsi
> index b48d5da147273..9716f24f7c6ed 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql.dtsi
> @@ -16,15 +16,6 @@ memory at 40000000 {
>  		reg = <0x0 0x40000000 0 0x80000000>;
>  	};
>  
> -	/* identical to buck4_reg, but should never change */
> -	reg_vcc3v3: regulator-vcc3v3 {
> -		compatible = "regulator-fixed";
> -		regulator-name = "VCC3V3";
> -		regulator-min-microvolt = <3300000>;
> -		regulator-max-microvolt = <3300000>;
> -		regulator-always-on;
> -	};
> -
>  	reg_usdhc2_vqmmc: regulator-usdhc2-vqmmc {
>  		compatible = "regulator-gpio";
>  		pinctrl-names = "default";
> @@ -187,14 +178,14 @@ at24c02: eeprom at 53 {
>  		read-only;
>  		reg = <0x53>;
>  		pagesize = <16>;
> -		vcc-supply = <&reg_vcc3v3>;
> +		vcc-supply = <&buck4_reg>;
>  	};
>  
>  	m24c64: eeprom at 57 {
>  		compatible = "atmel,24c64";
>  		reg = <0x57>;
>  		pagesize = <32>;
> -		vcc-supply = <&reg_vcc3v3>;
> +		vcc-supply = <&buck4_reg>;
>  	};
>  };
>  
> @@ -211,7 +202,7 @@ &usdhc3 {
>  	non-removable;
>  	no-sd;
>  	no-sdio;
> -	vmmc-supply = <&reg_vcc3v3>;
> +	vmmc-supply = <&buck4_reg>;
>  	vqmmc-supply = <&buck5_reg>;
>  	status = "okay";
>  };

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