The driver is a thin UCLASS_THERMAL: its get_temp reads the temperature of its parent regulator through the pmbus helper (READ_TEMPERATURE_1), without any chip-specific code.
Signed-off-by: Vincent Jardin <[email protected]> --- (no changes since v1) MAINTAINERS | 1 + drivers/thermal/Kconfig | 8 ++++++++ drivers/thermal/Makefile | 1 + drivers/thermal/pmbus_thermal.c | 33 +++++++++++++++++++++++++++++++++ 4 files changed, 43 insertions(+) create mode 100644 drivers/thermal/pmbus_thermal.c diff --git a/MAINTAINERS b/MAINTAINERS index 5ba9b195c0b..9efc137eb1d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1589,6 +1589,7 @@ F: drivers/power/regulator/mpq8785.c F: drivers/power/regulator/pmbus_generic.c F: drivers/power/regulator/pmbus_helper.c F: drivers/power/regulator/pmbus_helper.h +F: drivers/thermal/pmbus_thermal.c F: include/pmbus.h F: lib/pmbus.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 91c39aa4dee..30bb64ce895 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -55,4 +55,12 @@ config TI_LM74_THERMAL Enable thermal support for the Texas Instruments LM74 chip. The driver supports reading CPU temperature. +config PMBUS_THERMAL + bool "Generic PMBus temperature" + depends on DM_REGULATOR_PMBUS_HELPER + help + Expose the die-temperature reading of any PMBus voltage + regulator bound by a pmbus_helper based chip driver + as a UCLASS_THERMAL device. + endif # if DM_THERMAL diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index b6f06c00ed9..25435f43b64 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_RCAR_GEN3_THERMAL) += rcar_gen3_thermal.o obj-$(CONFIG_SANDBOX) += thermal_sandbox.o obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o obj-$(CONFIG_TI_LM74_THERMAL) += ti-lm74.o +obj-$(CONFIG_PMBUS_THERMAL) += pmbus_thermal.o diff --git a/drivers/thermal/pmbus_thermal.c b/drivers/thermal/pmbus_thermal.c new file mode 100644 index 00000000000..c251cea8ddf --- /dev/null +++ b/drivers/thermal/pmbus_thermal.c @@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2026 Free Mobile - Vincent Jardin + * + * Generic UCLASS_THERMAL companion for PMBus voltage regulators. + * + * Works with any chip bound by a pmbus_helper based regulator driver + * (drivers/power/regulator/<chip>.c calling + * pmbus_regulator_probe_common()). It auto-spawns one + * of these thermal devices per regulator. + * + * The reading is the chip's READ_TEMPERATURE_1 (PMBus 0x8D), decoded + * through the parent's pmbus_driver_info. + */ + +#include <dm.h> +#include <pmbus.h> +#include <thermal.h> + +static int pmbus_thermal_get_temp(struct udevice *dev, int *temp) +{ + return pmbus_regulator_read_temp(dev_get_parent(dev), temp); +} + +static const struct dm_thermal_ops pmbus_thermal_ops = { + .get_temp = pmbus_thermal_get_temp, +}; + +U_BOOT_DRIVER(pmbus_thermal) = { + .name = "pmbus_thermal", + .id = UCLASS_THERMAL, + .ops = &pmbus_thermal_ops, +}; -- 2.43.0
