[PATCH 6.18 164/175] regulator: spacemit-p1: Fix n_voltages for BUCK and LDO regulators

Greg Kroah-Hartman
2026-02-09T14:35:01Z

From: Guodong Xu <guodong@riscstar.com>

[ Upstream commit 41399c5d476156635c9a58de870d39318e22fa09 ]

Higher voltage settings were unusable due to incorrect n_voltages values
causing registration failures. For example, setting aldo4 to 3.3V failed
with -EINVAL because the required selector (123) exceeded the allowed
range (n_voltages=117).

Fix by aligning n_voltages with the hardware register widths per the P1
datasheet [1]:
- BUCK: 255 (was 254), allows selectors 0-254, selector 255 is reserved
- LDO: 128 (was 117), allows selectors 0-127, selectors 0-10 are for
suspend mode, valid operational range is 11-127

This enables the full voltage range supported by the hardware.

Fixes: 8b84d712ad84 ("regulator: spacemit: support SpacemiT P1 regulators")
Link: https://developer.spacemit.com/documentation [1]
Signed-off-by: Guodong Xu <guodong@riscstar.com>
Link: https://patch.msgid.link/20260122-spacemit-p1-v1-1-309be27fbff9@riscstar.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/regulator/spacemit-p1.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/spacemit-p1.c b/drivers/regulator/spacemit-p1.c
index 2bf9137e12b1d..2b585ba01a93d 100644
--- a/drivers/regulator/spacemit-p1.c
+++ b/drivers/regulator/spacemit-p1.c
@@ -87,13 +87,13 @@ static const struct linear_range p1_ldo_ranges[] = {
}

#define P1_BUCK_DESC(_n) \
- P1_REG_DESC(BUCK, buck, _n, "vin", 0x47, BUCK_MASK, 254, p1_buck_ranges)
+ P1_REG_DESC(BUCK, buck, _n, "vin", 0x47, BUCK_MASK, 255, p1_buck_ranges)

#define P1_ALDO_DESC(_n) \
- P1_REG_DESC(ALDO, aldo, _n, "vin", 0x5b, LDO_MASK, 117, p1_ldo_ranges)
+ P1_REG_DESC(ALDO, aldo, _n, "vin", 0x5b, LDO_MASK, 128, p1_ldo_ranges)

#define P1_DLDO_DESC(_n) \
- P1_REG_DESC(DLDO, dldo, _n, "buck5", 0x67, LDO_MASK, 117, p1_ldo_ranges)
+ P1_REG_DESC(DLDO, dldo, _n, "buck5", 0x67, LDO_MASK, 128, p1_ldo_ranges)

static const struct regulator_desc p1_regulator_desc[] = {
P1_BUCK_DESC(1),
--
2.51.0