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ARM: dts: amlogic: meson8-fernsehfee3: Describe regulators

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The fernsehfee3 board uses a Ricoh RN5T618 PMIC to generate various
voltages. Board schematics are not available, but the regulator voltages
found in /sys/kernel/debug/regulator/regulator_summary match those in
meson8m2-mxiii-plus.dts:

 DCDC1               0    0      0 unknown  1100mV     0mA     0mV     0mV
 DCDC2               0    0      0 unknown  1150mV     0mA     0mV     0mV
 DCDC3               0    0      0 unknown  1500mV     0mA     0mV     0mV
 LDO1                0    0      0 unknown  2900mV     0mA     0mV     0mV
 LDO2                0    0      0 unknown  1800mV     0mA     0mV     0mV
 LDO3                0    0      0 unknown  1800mV     0mA     0mV     0mV
 LDO4                0    0      0 unknown  2850mV     0mA     0mV     0mV
 LDO5                0    0      0 unknown  1800mV     0mA     0mV     0mV
 LDORTC1             0    0      0 unknown  2700mV     0mA     0mV     0mV
 LDORTC2             0    0      0 unknown   900mV     0mA     0mV     0mV

This patch takes the following approach:

 - Copy RN5T618 regulator nodes from meson8m2-mxiii-plus.dts
 - Remove some of the regulator names, which do not seem to apply
 - Verify regulator supply relations by starting without any relations
   (and without regulator-always-on) and seeing what breaks when the
   kernel turns off "unused" regulators.

This results in the following observations:

 - When LDO1 is turned off, the board resets
 - When DCDC1, DCDC2, DCDC3, LDO2, or LDO5 are turned off, the board (as
   observed through the serial port) stops running, so these must stay on
   at all times.
 - LDO4 (VCC2V8) appears to be unused on this board.
 - LDO3 (VCC1V8_USB) must stay on in order for USB to work, both the
   external USB ports and the internal USB wifi module.

The cpu-supply and mali-supply relations are also copied from
meson8m2-mxiii-plus.dts

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20250428-fernsehfee-v2-4-293b98a43a91@posteo.net
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
J. Neuschäfer
2025-04-28 12:44:31 +02:00
committed by Neil Armstrong
parent dac9287579
commit 2c1879a440
1 changed files with 91 additions and 0 deletions
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91
arch/arm/boot/dts/amlogic/meson8-fernsehfee3.dts
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@@ -85,6 +85,10 @@ wifi_3v3: regulator-wifi {
};
};
&cpu0 {
cpu-supply = <&vcck>;
};
&ethmac {
status = "okay";
pinctrl-0 = <&eth_pins>;
@@ -117,6 +121,87 @@ pmic@32 {
compatible = "ricoh,rn5t618";
reg = <0x32>;
system-power-controller;
regulators {
vcck: DCDC1 {
regulator-name = "VCCK";
regulator-min-microvolt = <825000>;
regulator-max-microvolt = <1150000>;
regulator-boot-on;
regulator-always-on;
};
vddee: DCDC2 {
/* the output is also used as VDDAO */
regulator-name = "VDD_EE";
regulator-min-microvolt = <950000>;
regulator-max-microvolt = <1150000>;
regulator-boot-on;
regulator-always-on;
};
DCDC3 {
regulator-name = "VDD_DDR";
regulator-min-microvolt = <1500000>;
regulator-max-microvolt = <1500000>;
regulator-boot-on;
regulator-always-on;
};
LDO1 {
regulator-name = "VDDIO_AO28";
regulator-min-microvolt = <2900000>;
regulator-max-microvolt = <2900000>;
regulator-boot-on;
regulator-always-on;
};
LDO2 {
regulator-name = "VDDIO_AO18";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
};
vcc1v8_usb: LDO3 {
regulator-name = "VCC1V8_USB";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
};
LDO4 {
/* This one appears to be unused */
regulator-name = "VCC2V8";
regulator-min-microvolt = <2850000>;
regulator-max-microvolt = <2850000>;
};
LDO5 {
regulator-name = "AVDD1V8";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
};
LDORTC1 {
regulator-name = "VDD_LDO";
regulator-min-microvolt = <2700000>;
regulator-max-microvolt = <2700000>;
regulator-boot-on;
regulator-always-on;
};
LDORTC2 {
regulator-name = "RTC_0V9";
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <900000>;
regulator-boot-on;
regulator-always-on;
};
};
};
eeprom@50 {
@@ -137,6 +222,10 @@ &i2c_B {
/* TODO: SiI9293 HDMI receiver @ 0x39 */
};
&mali {
mali-supply = <&vddee>;
};
&sdhc {
status = "okay";
pinctrl-0 = <&sdxc_c_pins>;
@@ -188,6 +277,7 @@ &usb0 {
&usb0_phy {
status = "okay";
phy-supply = <&vcc1v8_usb>;
};
&usb1 {
@@ -206,6 +296,7 @@ wifi: wifi@1 {
&usb1_phy {
status = "okay";
phy-supply = <&vcc1v8_usb>;
};
&ir_receiver {