Add the regulators layout for this platform, including the basic power
rails controlled by the EC (and/or always on).
Moreover, include the MT6359 PMIC devicetree and add some configuration
for its regulators, essential to keep the machine alive after booting.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 .../boot/dts/mediatek/mt8195-cherry.dtsi      | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index 14f8f30b1eb3..091338f7d5ff 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -5,6 +5,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include "mt8195.dtsi"
+#include "mt6359.dtsi"
 
 / {
 	aliases {
@@ -19,6 +20,107 @@ memory@40000000 {
 		device_type = "memory";
 		reg = <0 0x40000000 0 0x80000000>;
 	};
+
+	/* system wide LDO 3.3V power rail */
+	pp3300_z5: regulator-3v3-pp3300-ldo-z5 {
+		compatible = "regulator-fixed";
+		regulator-name = "pp3300_ldo_z5";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&ppvar_sys>;
+	};
+
+	/* separately switched 3.3V power rail */
+	pp3300_s3: regulator-3v3-pp3300-s3 {
+		compatible = "regulator-fixed";
+		regulator-name = "pp3300_s3";
+		/* automatically sequenced by PMIC EXT_PMIC_EN2 */
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&pp3300_z2>;
+	};
+
+	/* system wide 3.3V power rail */
+	pp3300_z2: regulator-3v3-pp3300-z2 {
+		compatible = "regulator-fixed";
+		regulator-name = "pp3300_z2";
+		/* EN pin tied to pp4200_z2, which is controlled by EC */
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&ppvar_sys>;
+	};
+
+	/* system wide 4.2V power rail */
+	pp4200_z2: regulator-4v2-pp4200-z2 {
+		compatible = "regulator-fixed";
+		regulator-name = "pp4200_z2";
+		/* controlled by EC */
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <4200000>;
+		regulator-max-microvolt = <4200000>;
+		vin-supply = <&ppvar_sys>;
+	};
+
+	/* system wide switching 5.0V power rail */
+	pp5000_s5: regulator-5v0-pp5000-s5 {
+		compatible = "regulator-fixed";
+		regulator-name = "pp5000_s5";
+		/* controlled by EC */
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		vin-supply = <&ppvar_sys>;
+	};
+
+	/* system wide semi-regulated power rail from battery or USB */
+	ppvar_sys: regulator-ppvar-sys {
+		compatible = "regulator-fixed";
+		regulator-name = "ppvar_sys";
+		regulator-always-on;
+		regulator-boot-on;
+	};
+};
+
+/* for CPU-L */
+&mt6359_vcore_buck_reg {
+	regulator-always-on;
+};
+
+/* for CORE */
+&mt6359_vgpu11_buck_reg {
+	regulator-always-on;
+};
+
+&mt6359_vgpu11_sshub_buck_reg {
+	regulator-always-on;
+	regulator-min-microvolt = <550000>;
+	regulator-max-microvolt = <550000>;
+};
+
+/* for CORE SRAM */
+&mt6359_vpu_buck_reg {
+	regulator-always-on;
+};
+
+&mt6359_vrf12_ldo_reg {
+	regulator-always-on;
+};
+
+/* for GPU SRAM */
+&mt6359_vsram_others_ldo_reg {
+	regulator-always-on;
+	regulator-min-microvolt = <750000>;
+	regulator-max-microvolt = <750000>;
+};
+
+&mt6359_vufs_ldo_reg {
+	regulator-always-on;
 };
 
 &pmic {
-- 
2.35.1

On Thu, Jun 30, 2022 at 05:33:09PM +0200, AngeloGioacchino Del Regno wrote:
> Add the regulators layout for this platform, including the basic power
> rails controlled by the EC (and/or always on).
> Moreover, include the MT6359 PMIC devicetree and add some configuration
> for its regulators, essential to keep the machine alive after booting.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  .../boot/dts/mediatek/mt8195-cherry.dtsi      | 102 ++++++++++++++++++
>  1 file changed, 102 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> index 14f8f30b1eb3..091338f7d5ff 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> @@ -5,6 +5,7 @@
>  
>  #include <dt-bindings/gpio/gpio.h>
>  #include "mt8195.dtsi"
> +#include "mt6359.dtsi"
>  
>  / {
>  	aliases {
> @@ -19,6 +20,107 @@ memory@40000000 {
>  		device_type = "memory";
>  		reg = <0 0x40000000 0 0x80000000>;
>  	};
> +
> +	/* system wide LDO 3.3V power rail */
> +	pp3300_z5: regulator-3v3-pp3300-ldo-z5 {

I wouldn't have both "3v3" and "pp3300" in the node name since they mean the
same thing, but feel free to ignore this comment :).

> +		compatible = "regulator-fixed";
> +		regulator-name = "pp3300_ldo_z5";
> +		regulator-always-on;
> +		regulator-boot-on;
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		vin-supply = <&ppvar_sys>;
> +	};
> +
> +	/* separately switched 3.3V power rail */
> +	pp3300_s3: regulator-3v3-pp3300-s3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pp3300_s3";
> +		/* automatically sequenced by PMIC EXT_PMIC_EN2 */
> +		regulator-always-on;
> +		regulator-boot-on;

Missing regulator-min/max-microvolt?

> +		vin-supply = <&pp3300_z2>;
> +	};
[..]
> -- 
> 2.35.1
> 

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>

Thanks,
Nícolas