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| author |   J. Neuschäfer <j.ne@posteo.net> | 2025-04-28 12:44:31 +0200 |
|---|---|---|
| committer |   Neil Armstrong <neil.armstrong@linaro.org> | 2025-05-09 17:37:05 +0200 |
| commit | 2c1879a440315e0b292bbff0fa63a73bd8a52e34 (patch) | |
| tree | ce967a34a89700ab251dd072b52dd23a916d16fe /scripts/lib/kdoc/kdoc_parser.py | |
| parent | ARM: dts: amlogic: Add TCU Fernsehfee 3.0 (diff) | |
| download | linux-rng-2c1879a440315e0b292bbff0fa63a73bd8a52e34.tar.xz linux-rng-2c1879a440315e0b292bbff0fa63a73bd8a52e34.zip | |
ARM: dts: amlogic: meson8-fernsehfee3: Describe regulators
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>
Diffstat (limited to 'scripts/lib/kdoc/kdoc_parser.py')
0 files changed, 0 insertions, 0 deletions