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From dac6c4c03140835b758e32c72eb004d379c35fec Mon Sep 17 00:00:00 2001
From: Thara Gopinath <thara@ti.com>
Date: Fri, 29 Oct 2010 20:43:10 +0530
Subject: [PATCH 07/20] OMAP: Introduce API in the OPP layer to find the opp entry corresponding to a voltage.
This patch adds an API in the opp layer to get the opp table entry
corresponding to the voltage passed as the parameter.
Signed-off-by: Thara Gopinath <thara@ti.com>
---
drivers/base/power/opp.c | 28 ++++++++++++++++++++++++++++
include/linux/opp.h | 8 ++++++++
2 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 2bb9b4c..60b4478 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -354,6 +354,34 @@ struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq)
}
/**
+ * opp_find_voltage() - search for an exact voltage
+ * @dev: device pointer associated with the opp type
+ * @volt: voltage to search for
+ *
+ * Searches for exact match in the opp list and returns handle to the matching
+ * opp if found, else returns ERR_PTR in case of error and should be handled
+ * using IS_ERR.
+ */
+struct opp *opp_find_voltage(struct device *dev, unsigned long volt)
+{
+ struct device_opp *dev_opp;
+ struct opp *temp_opp, *opp = ERR_PTR(-ENODEV);
+
+ dev_opp = find_device_opp(dev);
+ if (IS_ERR(dev_opp))
+ return opp;
+
+ list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
+ if (temp_opp->available && temp_opp->u_volt == volt) {
+ opp = temp_opp;
+ break;
+ }
+ }
+
+ return opp;
+}
+
+/**
* opp_add() - Add an OPP table from a table definitions
* @dev: device for which we do this operation
* @freq: Frequency in Hz for this OPP
diff --git a/include/linux/opp.h b/include/linux/opp.h
index 5449945..4977d5c 100644
--- a/include/linux/opp.h
+++ b/include/linux/opp.h
@@ -34,6 +34,8 @@ struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq);
struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq);
+struct opp *opp_find_voltage(struct device *dev, unsigned long volt);
+
int opp_add(struct device *dev, unsigned long freq, unsigned long u_volt);
int opp_enable(struct device *dev, unsigned long freq);
@@ -74,6 +76,12 @@ static inline struct opp *opp_find_freq_ceil(struct device *dev,
return ERR_PTR(-EINVAL);
}
+static inline struct opp *opp_find_voltage(struct device *dev,
+ unsigned long volt)
+{
+ return ERR_PTR(-EINVAL);
+}
+
static inline int opp_add(struct device *dev, unsigned long freq,
unsigned long u_volt)
{
--
1.6.6.1
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