diff options
| author | Kory Maincent (TI.com) <kory.maincent@bootlin.com> | 2025-12-18 18:06:28 +0300 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2026-01-22 17:22:54 +0300 |
| commit | d3fcf276b501a82d4504fd5b1ed40249546530d1 (patch) | |
| tree | f4e36a61771b8c778d53cd277f8befa873052346 /include/linux | |
| parent | 05995af05b958dc22cb3b28a8d2ee0e79c7b4484 (diff) | |
| download | linux-d3fcf276b501a82d4504fd5b1ed40249546530d1.tar.xz | |
mfd: tps65219: Implement LOCK register handling for TPS65214
The TPS65214 PMIC variant has a LOCK_REG register that prevents writes to
nearly all registers when locked. Unlock the registers at probe time and
leave them unlocked permanently.
This approach is justified because:
- Register locking is very uncommon in typical system operation
- No code path is expected to lock the registers during runtime
- Adding a custom regmap write function would add overhead to every
register write, including voltage changes triggered by CPU OPP
transitions from the cpufreq governor which could happen quite
frequently
Cc: stable@vger.kernel.org
Fixes: 7947219ab1a2d ("mfd: tps65219: Add support for TI TPS65214 PMIC")
Reviewed-by: Andrew Davis <afd@ti.com>
Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20251218-fix_tps65219-v5-1-8bb511417f3a@bootlin.com
Signed-off-by: Lee Jones <lee@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mfd/tps65219.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mfd/tps65219.h b/include/linux/mfd/tps65219.h index 55234e771ba7..3abf937191d0 100644 --- a/include/linux/mfd/tps65219.h +++ b/include/linux/mfd/tps65219.h @@ -149,6 +149,8 @@ enum pmic_id { #define TPS65215_ENABLE_LDO2_EN_MASK BIT(5) #define TPS65214_ENABLE_LDO1_EN_MASK BIT(5) #define TPS65219_ENABLE_LDO4_EN_MASK BIT(6) +/* Register Unlock */ +#define TPS65214_LOCK_ACCESS_CMD 0x5a /* power ON-OFF sequence slot */ #define TPS65219_BUCKS_LDOS_SEQUENCE_OFF_SLOT_MASK GENMASK(3, 0) #define TPS65219_BUCKS_LDOS_SEQUENCE_ON_SLOT_MASK GENMASK(7, 4) |