regulator: mp8859: Specify register accessibility and enable caching

Avoid needless accesses to the hardware by caching register values that
we know, marking status registers as volatile as appropriate.

Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://msgid.link/r/20240225-regulator-mp8859-v1-1-68ee2c839ded@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/mp8859.c b/drivers/regulator/mp8859.c
index b820bd6043e53bf217f0d60f2d57f0355319315b..689b56680d93404f75edcd17fd30a506325a22a1 100644 (file)
--- a/drivers/regulator/mp8859.c
+++ b/drivers/regulator/mp8859.c
@@ -77,11 +77,47 @@ static const struct linear_range mp8859_dcdc_ranges[] = {
        REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
 };
 
+static bool mp8859_readable(struct device *dev, unsigned int reg)
+{
+       switch (reg) {
+       case MP8859_VOUT_L_REG:
+       case MP8859_VOUT_H_REG:
+       case MP8859_VOUT_GO_REG:
+       case MP8859_IOUT_LIM_REG:
+       case MP8859_CTL1_REG:
+       case MP8859_CTL2_REG:
+       case MP8859_STATUS_REG:
+       case MP8859_INTERRUPT_REG:
+       case MP8859_MASK_REG:
+       case MP8859_ID1_REG:
+       case MP8859_MFR_ID_REG:
+       case MP8859_DEV_ID_REG:
+       case MP8859_IC_REV_REG:
+               return true;
+       default:
+               return false;
+       }
+}
+
+static bool mp8859_volatile(struct device *dev, unsigned int reg)
+{
+       switch (reg) {
+       case MP8859_VOUT_GO_REG:
+       case MP8859_STATUS_REG:
+       case MP8859_INTERRUPT_REG:
+               return true;
+       default:
+               return false;
+       }
+}
+
 static const struct regmap_config mp8859_regmap = {
        .reg_bits = 8,
        .val_bits = 8,
        .max_register = MP8859_MAX_REG,
-       .cache_type = REGCACHE_RBTREE,
+       .cache_type = REGCACHE_MAPLE,
+       .readable_reg = mp8859_readable,
+       .volatile_reg = mp8859_volatile,
 };
 
 static const struct regulator_ops mp8859_ops = {