[PATCH] regulator: qcom-rpmh: Add support for regulator-off-on-delay-us

[Saikiran <bjsaikiran@gmail.com>]

Some Qualcomm platforms require a significant delay after powering off a
rail before it can be powered on again, especially for regulators that
depend on passive discharge.

The core regulator framework supports this via the 'regulator-off-on-delay-us'
property, but the RPMh regulator driver currently ignores it.

Add support for parsing this generic property from device tree and
populating the regulator descriptor. This allows board-specific DTS files
to specify required discharge delays for RPMh-controlled regulators.

Tested-on: Lenovo Yoga Slim 7x (Snapdragon X Elite)
Signed-off-by: Saikiran <bjsaikiran@gmail.com>
---
 drivers/regulator/qcom-rpmh-regulator.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/regulator/qcom-rpmh-regulator.c b/drivers/regulator/qcom-rpmh-regulator.c
index 6e4cb2871fca..aafba61551b3 100644
--- a/drivers/regulator/qcom-rpmh-regulator.c
+++ b/drivers/regulator/qcom-rpmh-regulator.c
@@ -503,6 +503,9 @@ static int rpmh_regulator_init_vreg(struct rpmh_vreg *vreg, struct device *dev,
 	vreg->always_wait_for_ack = of_property_read_bool(node,
 						"qcom,always-wait-for-ack");
 
+	of_property_read_u32(node, "regulator-off-on-delay-us",
+			     &vreg->rdesc.off_on_delay);
+
 	vreg->rdesc.owner	= THIS_MODULE;
 	vreg->rdesc.type	= REGULATOR_VOLTAGE;
 	vreg->rdesc.ops		= vreg->hw_data->ops;
-- 
2.51.0