Probes the +3V3_FAN fixed regulator The rail is regulator-always-on, so the probe drives it on and the FAN daughterboard's EMC2305 / TMP411 / EEPROM become visible to i2c probe
Signed-off-by: Vincent Jardin <[email protected]> --- board/nxp/lx2160a/Kconfig | 6 ++++++ board/nxp/lx2160a/nbxv3/Makefile | 1 + board/nxp/lx2160a/nbxv3/fan_power.c | 32 +++++++++++++++++++++++++++++ 3 files changed, 39 insertions(+) create mode 100644 board/nxp/lx2160a/nbxv3/fan_power.c diff --git a/board/nxp/lx2160a/Kconfig b/board/nxp/lx2160a/Kconfig index 12d2e418aa5..efd245bb68a 100644 --- a/board/nxp/lx2160a/Kconfig +++ b/board/nxp/lx2160a/Kconfig @@ -83,4 +83,10 @@ config NBXV3_DPLL select DM_SPI select FSL_DSPI +config NBXV3_FAN + bool + default y + select DM_REGULATOR + select DM_REGULATOR_FIXED + endif diff --git a/board/nxp/lx2160a/nbxv3/Makefile b/board/nxp/lx2160a/nbxv3/Makefile index c8a676fb708..82063017432 100644 --- a/board/nxp/lx2160a/nbxv3/Makefile +++ b/board/nxp/lx2160a/nbxv3/Makefile @@ -8,3 +8,4 @@ obj-y += dpll_zl30733.o obj-y += mps_pmbus.o obj-y += psu_pmbus.o obj-y += vid_handoff.o +obj-y += fan_power.o diff --git a/board/nxp/lx2160a/nbxv3/fan_power.c b/board/nxp/lx2160a/nbxv3/fan_power.c new file mode 100644 index 00000000000..faa882b8bf8 --- /dev/null +++ b/board/nxp/lx2160a/nbxv3/fan_power.c @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2026 Free Mobile - Vincent Jardin + * + * Enforce Nodebox v3 FAN-daughterboard enable. + * + * Note: it tequires CONFIG_DM_REGULATOR_FIXED + */ + +#include <dm.h> +#include <event.h> +#include <power/regulator.h> + +/* `regulator-name = "+3V3_FAN"` in the nbxv3 DTS. */ +#define NBXV3_FAN_REGULATOR_NAME "+3V3_FAN" + +static int nbxv3_fan_power_last_stage_init(void) +{ + struct udevice *reg = NULL; + int ret; + + if (regulator_get_by_platname(NBXV3_FAN_REGULATOR_NAME, ®) || !reg) + return 0; + + ret = regulator_set_enable_if_allowed(reg, true); + if (ret) + printf("nbxv3: %s enable failed (%d)\n", + NBXV3_FAN_REGULATOR_NAME, ret); + + return 0; +} +EVENT_SPY_SIMPLE(EVT_LAST_STAGE_INIT, nbxv3_fan_power_last_stage_init); -- 2.43.0
