[PATCH 2/5] regulator: rohm-regulator: add helper for restricted voltage setting

From: Matti Vaittinen
Date: Thu Nov 18 2021 - 06:49:21 EST


Few ROHM PMICs have regulators where voltage setting can be done only
when regulator is disabled. Add helper for those PMICs.

Signed-off-by: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>
---
drivers/regulator/rohm-regulator.c | 16 ++++++++++++++++
include/linux/mfd/rohm-generic.h | 7 +++++++
2 files changed, 23 insertions(+)

diff --git a/drivers/regulator/rohm-regulator.c b/drivers/regulator/rohm-regulator.c
index 6e0d9c08ec1c..f97a9a51ee76 100644
--- a/drivers/regulator/rohm-regulator.c
+++ b/drivers/regulator/rohm-regulator.c
@@ -112,6 +112,22 @@ int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
}
EXPORT_SYMBOL(rohm_regulator_set_dvs_levels);

+/*
+ * Few ROHM PMIC ICs have constrains on voltage changing:
+ * BD71837 - only buck 1-4 voltages can be changed when they are enabled.
+ * Other bucks and all LDOs must be disabled when voltage is changed.
+ * BD96801 - LDO voltage levels can be changed when LDOs are disabled.
+ */
+int rohm_regulator_set_voltage_sel_restricted(struct regulator_dev *rdev,
+ unsigned int sel)
+{
+ if (rdev->desc->ops->is_enabled(rdev))
+ return -EBUSY;
+
+ return regulator_set_voltage_sel_regmap(rdev, sel);
+}
+EXPORT_SYMBOL_GPL(rohm_regulator_set_voltage_sel_restricted);
+
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION("Generic helpers for ROHM PMIC regulator drivers");
diff --git a/include/linux/mfd/rohm-generic.h b/include/linux/mfd/rohm-generic.h
index 35b392a0d73a..35c5866f48b7 100644
--- a/include/linux/mfd/rohm-generic.h
+++ b/include/linux/mfd/rohm-generic.h
@@ -80,6 +80,8 @@ int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
const struct regulator_desc *desc,
struct regmap *regmap);

+int rohm_regulator_set_voltage_sel_restricted(struct regulator_dev *rdev,
+ unsigned int sel);
#else
static inline int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
struct device_node *np,
@@ -88,6 +90,11 @@ static inline int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dv
{
return 0;
}
+static int rohm_regulator_set_voltage_sel_restricted(struct regulator_dev *rdev,
+ unsigned int sel)
+{
+ return 0;
+}
#endif

#endif
--
2.31.1


--
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]

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