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arm64: dts: amlogic: t7: khadas-vim4: add the PWM-driven supplies

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The board powers its two CPU clusters, the GPU, the NPU, the memory and
the always-on domain from regulators steered by PWM outputs. None of
them were described, so Linux treated those outputs as unused and
switched them off part way through boot. The supplies then drifted away
from the levels the bootloader had set, which showed up as random hangs
and memory corruption.

Describe each supply so it has an owner and is left alone.

The voltage ranges are read off the feedback networks on the board
schematic. VDDNPU is deliberately not the range in Amlogic's own
device tree: this board fits a different feedback resistor, which
puts it about 40mV higher at both ends.

Fixes: 8c45bf9ae4 ("arm64: dts: amlogic: t7: khadas-vim4: Add power regulators")
Assisted-by: Claude:claude-opus-5
Signed-off-by: Lucas Tanure <tanure@linux.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260829094758.23248-4-tanure@linux.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Lucas Tanure 2026-08-29 10:47:57 +01:00 committed by Neil Armstrong
parent ae7be5c58a
commit 1e5a53bd16
1 changed files with 109 additions and 1 deletions
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110
arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
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@ -104,6 +104,66 @@ vcc5v0_usb: regulator-vcc-usb {
enable-active-high;
};
vdd_ddr: regulator-vddddr {
/*
* SY8003ADFC Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDDDR";
regulator-min-microvolt = <690000>;
regulator-max-microvolt = <890000>;
pwm-supply = <&dc_in>;
pwms = <&pwm_ao_gh 0 1500 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
vdd_ee: regulator-vddee {
/*
* MP8756GD Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDEE";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <922000>;
pwm-supply = <&dc_in>;
pwms = <&pwm_ao_ab 0 1500 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
vdd_gpu: regulator-vddgpu {
/*
* SY8003ADFC Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDGPU";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <922000>;
pwm-supply = <&dc_in>;
pwms = <&pwm_ao_ef 0 1500 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
vdd_npu: regulator-vddnpu {
/*
* SY8003ADFC Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDNPU";
regulator-min-microvolt = <733000>;
regulator-max-microvolt = <933000>;
pwm-supply = <&dc_in>;
pwms = <&pwm_ao_ef 1 1500 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
vddao_1v8: regulator-vddao-1v8 {
compatible = "regulator-fixed";
regulator-name = "VDDAO_1V8";
@ -122,6 +182,36 @@ vddao_3v3: regulator-vddao-3v3 {
regulator-always-on;
};
vddcpu_a: regulator-vddcpu-a {
/*
* MP8756GD Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDCPU_A";
regulator-min-microvolt = <689000>;
regulator-max-microvolt = <1049000>;
pwm-supply = <&dc_in>;
pwms = <&pwm_ao_cd 1 1500 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
vddcpu_b: regulator-vddcpu-b {
/*
* MP8756GD Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDCPU_B";
regulator-min-microvolt = <689000>;
regulator-max-microvolt = <1049000>;
pwm-supply = <&dc_in>;
pwms = <&pwm_ao_ab 1 1500 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
vddio_1v8: regulator-vddio-1v8 {
compatible = "regulator-fixed";
regulator-name = "VDDIO_1V8";
@ -172,9 +262,27 @@ &pwm_ab {
pinctrl-names = "default";
};
&pwm_ao_ab {
status = "okay";
pinctrl-0 = <&pwm_ao_a_pins>, <&pwm_ao_b_pins>;
pinctrl-names = "default";
};
&pwm_ao_cd {
status = "okay";
pinctrl-0 = <&pwm_ao_c_d_pins>;
pinctrl-0 = <&pwm_ao_c_d_pins>, <&pwm_ao_d_pins>;
pinctrl-names = "default";
};
&pwm_ao_ef {
status = "okay";
pinctrl-0 = <&pwm_ao_e_pins>, <&pwm_ao_f_pins>;
pinctrl-names = "default";
};
&pwm_ao_gh {
status = "okay";
pinctrl-0 = <&pwm_ao_g_e_pins>;
pinctrl-names = "default";
};