[Resending because the previous attempt did not reach the mailing lists.]
This new API is needed for a downstream GPU driver, but posting it as an RFC to make sure that we implement it in a potentially upstreamable way or in case someone needs it for an upstream user later.
Add API to get voltage for multiple supplies from opp table
Signed-off-by: Nick Fan <[email protected]>
---
drivers/opp/core.c | 28 ++++++++++++++++++++++++++++
include/linux/pm_opp.h | 3 +++
2 files changed, 31 insertions(+)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 2c2df4e..ee73546 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -113,6 +113,34 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
/**
+ * dev_pm_opp_get_voltage_supply() - Gets the voltage corresponding to an opp
+ * with index
+ * @opp: opp for which voltage has to be returned for
+ * @index: index to specify the returned supplies
+ *
+ * Return: voltage in micro volt corresponding to the opp with index, else
+ * return 0
+ *
+ * This is useful for devices with multiple power supplies.
+ */
+unsigned long dev_pm_opp_get_voltage_supply(struct dev_pm_opp *opp,
+ unsigned int index)
+{
+ if (IS_ERR_OR_NULL(opp)) {
+ pr_err("%s: Invalid parameters\n", __func__);
+ return 0;
+ }
+
+ if (index >= opp->opp_table->regulator_count) {
+ pr_err("%s: Invalid supply index: %u\n", __func__, index);
+ return 0;
+ }
+
+ return opp->supplies[index].u_volt;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage_supply);
+
+/**
* dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
* @opp: opp for which frequency has to be returned for
*
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 5d399eee..2f1c2a8 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -84,6 +84,9 @@ struct dev_pm_set_opp_data {
unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
+unsigned long dev_pm_opp_get_voltage_supply(struct dev_pm_opp *opp,
+ unsigned int index);
+
unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
--
1.9.1