[PATCH v2 3/5] power: regulator: Exit from regulator_set_suspend_value on poorly described regulators

In case the DT regulator node does not contain 'regulator-max-microvolt'
property and does not contain 'regulator-state-mem' subnode (like the
test.dts regul1_scmi: reg@1 {} regulator node), then regulator_pre_probe()
will parse this regulator node and set uc_pdata->suspend_on = true and
uc_pdata->suspend_uV = uc_pdata->max_uV, where uc_pdata->max_uV is set
to -ENODATA because "regulator-max-microvolt" is missing, and therefore
uc_pdata->suspend_uV is also -ENODATA. In case regulator_autoset() is
used afterward, it will attempt to call regulator_set_suspend_value()
with uV = uc_pdata->suspend_uV = -ENODATA and fail with -EINVAL. Check
for this case in regulator_set_suspend_value() and immediately return 0,
because there is no way to set meaningful suspend voltage, so do nothing
and retain the existing settings of the regulator.

Signed-off-by: Marek Vasut <[email protected]>
---
Cc: Ben Wolsieffer <[email protected]>
Cc: Caleb Connolly <[email protected]>
Cc: Chris Morgan <[email protected]>
Cc: Dragan Simic <[email protected]>
Cc: Eugen Hristev <[email protected]>
Cc: Francesco Dolcini <[email protected]>
Cc: Heinrich Schuchardt <[email protected]>
Cc: Jaehoon Chung <[email protected]>
Cc: Jagan Teki <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Kever Yang <[email protected]>
Cc: Matteo Lisi <[email protected]>
Cc: Mattijs Korpershoek <[email protected]>
Cc: Max Krummenacher <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Patrice Chotard <[email protected]>
Cc: Patrick Delaunay <[email protected]>
Cc: Philipp Tomsich <[email protected]>
Cc: Quentin Schulz <[email protected]>
Cc: Sam Day <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Sumit Garg <[email protected]>
Cc: Svyatoslav Ryhel <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Volodymyr Babchuk <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
V2: New patch
---
 drivers/power/regulator/regulator-uclass.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c
index 14cf3159203..3c05fdf1966 100644
--- a/drivers/power/regulator/regulator-uclass.c
+++ b/drivers/power/regulator/regulator-uclass.c
@@ -85,6 +85,10 @@ int regulator_set_suspend_value(struct udevice *dev, int uV)
 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
 	struct dm_regulator_uclass_plat *uc_pdata;
 
+	/* Regulator did not set limits, assume already configured. */
+	if (uV == -ENODATA)
+		return 0;
+
 	uc_pdata = dev_get_uclass_plat(dev);
 	if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV)
 		return -EINVAL;
-- 
2.45.2