Re: [PATCH 1/2] ARM: dts: imx7-tqma7: correctly specify PMIC voltage constraints

[Frank Li <Frank.li@oss.nxp.com>]

On Wed, Sep 02, 2026 at 10:05:37AM +0200, Nora Schiffer wrote:
> regulator-(min|max)-microvolt refer to the supported voltages according
> to board design, not the possible range of the regulators themselves.

I think make sense, but any document or mail list can be refer to?

Frank

> Update the configuration for the TQMa7x's PMIC and also add a comment
> regarding the PMIC's VCC_SD switching feature.
>
> Fixes: a80a1af6ec8a ("ARM: dts: tq imx7 common board support")
> Signed-off-by: Nora Schiffer <nora.schiffer@ew.tq-group.com>
> ---
>  arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi | 40 +++++++++++++----------
>  1 file changed, 23 insertions(+), 17 deletions(-)
>
> diff --git a/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi b/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi
> index e1f740edfb763..7f49c80fef4c6 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi
> +++ b/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi
> @@ -46,8 +46,8 @@ pfuze3000: pmic@8 {
>
>  		regulators {
>  			sw1a_reg: sw1a {
> -				regulator-min-microvolt = <700000>;
> -				regulator-max-microvolt = <3300000>;
> +				regulator-min-microvolt = <1000000>;
> +				regulator-max-microvolt = <1225000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  				regulator-ramp-delay = <6250>;
> @@ -55,34 +55,33 @@ sw1a_reg: sw1a {
>
>  			/* use sw1c_reg to align with pfuze100/pfuze200 */
>  			sw1c_reg: sw1b {
> -				regulator-min-microvolt = <700000>;
> -				regulator-max-microvolt = <1475000>;
> +				regulator-min-microvolt = <1000000>;
> +				regulator-max-microvolt = <1000000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  				regulator-ramp-delay = <6250>;
>  			};
>
>  			sw2_reg: sw2 {
> -				regulator-min-microvolt = <1500000>;
> -				regulator-max-microvolt = <1850000>;
> +				regulator-min-microvolt = <1800000>;
> +				regulator-max-microvolt = <1800000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
>
>  			sw3a_reg: sw3 {
> -				regulator-min-microvolt = <900000>;
> -				regulator-max-microvolt = <1650000>;
> +				regulator-min-microvolt = <1350000>;
> +				regulator-max-microvolt = <1350000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
>
>  			swbst_reg: swbst {
> -				regulator-min-microvolt = <5000000>;
> -				regulator-max-microvolt = <5150000>;
> +				/* Not connected and left unconfigured */
>  			};
>
>  			snvs_reg: vsnvs {
> -				regulator-min-microvolt = <1000000>;
> +				regulator-min-microvolt = <3000000>;
>  				regulator-max-microvolt = <3000000>;
>  				regulator-boot-on;
>  				regulator-always-on;
> @@ -95,18 +94,25 @@ vref_reg: vrefddr {
>
>  			vgen1_reg: vldo1 {
>  				regulator-min-microvolt = <1800000>;
> -				regulator-max-microvolt = <3300000>;
> +				regulator-max-microvolt = <1800000>;
>  				regulator-always-on;
>  			};
>
>  			vgen2_reg: vldo2 {
> -				regulator-min-microvolt = <800000>;
> -				regulator-max-microvolt = <1550000>;
> +				regulator-min-microvolt = <1500000>;
> +				regulator-max-microvolt = <1500000>;
>  				regulator-always-on;
>  			};
>
>  			vgen3_reg: vccsd {
> -				regulator-min-microvolt = <2850000>;
> +				/*
> +				 * Specified values refer to 3.3V operation; voltage for 1.8V
> +				 * operation is derived from this.
> +				 *
> +				 * The base board should usually mux GPIO1_IO08 to SD1_VSELECT for
> +				 * automatic switching of SD card IO voltage.
> +				 */
> +				regulator-min-microvolt = <3300000>;
>  				regulator-max-microvolt = <3300000>;
>  				regulator-always-on;
>  			};
> @@ -118,13 +124,13 @@ vgen4_reg: v33 {
>  			};
>
>  			vgen5_reg: vldo3 {
> -				regulator-min-microvolt = <1800000>;
> +				regulator-min-microvolt = <3300000>;
>  				regulator-max-microvolt = <3300000>;
>  				regulator-always-on;
>  			};
>
>  			vgen6_reg: vldo4 {
> -				regulator-min-microvolt = <1800000>;
> +				regulator-min-microvolt = <3300000>;
>  				regulator-max-microvolt = <3300000>;
>  				regulator-always-on;
>  			};
> --
> TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
> Amtsgericht München, HRB 105018
> Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
> https://www.tq-group.com/
>
>