d52f7c35296e18b3b0c0fe482203d8e34aabddefa259db89cc02f487.patch

From b3248a41119d69d0d845a00c16bcdd85e9230b29 Mon Sep 17 00:00:00 2001
From: Nick Fan <Nick.Fan@mediatek.com>
Date: Fri, 2 Nov 2018 16:40:30 +0800
Subject: [PATCH] CHROMIUM: opp: Add API for getting voltage from supplies

Add API to get voltage for multiple supplies from opp table

(am from https://patchwork.kernel.org/patch/10730753/)
(also found at https://lkml.org/lkml/2018/12/4/114)

BUG=b:109911488
Test=build and boot to shell

Change-Id: I6e3f4320429b9267e58bc34cc147b9adc41c88ec
Signed-off-by: Nick Fan <Nick.Fan@mediatek.com>
Reviewed-on: https://chromium-review.googlesource.com/1377753
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
[rebase510(groeck): FROMLIST -> CHROMIUM (rejected upstream)]
Signed-off-by: Guenter Roeck <groeck@chromium.org>
---
 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 740407252298..b2f94604aac8 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_power() - Gets the power corresponding to an opp
  * @opp:	opp for which power has to be returned for
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 0d85a63a1f78..e9255ea1f984 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -97,6 +97,9 @@ void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
 
 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_power(struct dev_pm_opp *opp);
 
 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
-- 
2.35.0