linux-kernel - [PATCH RFC 1/9] OPP: Add and export helpers to get avg/peak bw

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Date:   Thu, 28 Mar 2019 20:58:14 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     robh+dt@...nel.org, andy.gross@...aro.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        rjw@...ysocki.net, viresh.kumar@...aro.org, nm@...com,
        sboyd@...nel.org, georgi.djakov@...aro.org
Cc:     bjorn.andersson@...aro.org, david.brown@...aro.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        linux-arm-msm-owner@...r.kernel.org, devicetree@...r.kernel.org,
        rnayak@...eaurora.org, cw00.choi@...sung.com,
        linux-pm@...r.kernel.org, evgreen@...omium.org,
        daidavid1@...eaurora.org, dianders@...omium.org,
        Sibi Sankar <sibis@...eaurora.org>
Subject: [PATCH RFC 1/9] OPP: Add and export helpers to get avg/peak bw

Add and export helpers 'dev_pm_opp_get_avg_bw()' and
'dev_pm_opp_get_peak_bw()' that can be used to get the
average and peak bandwidth values read from device tree
when present.

Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
---
 drivers/opp/core.c     | 38 ++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h | 12 ++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 4fcc2b9259c5..addaf7aae9ae 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -149,6 +149,44 @@ unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
 
+/**
+ * dev_pm_opp_get_avg_bw() - Gets the average bandwidth corresponding to an
+ * available opp
+ * @opp:	opp for which average bandwidth has to be returned for
+ *
+ * Return: average bandwidth read from device tree corresponding to the
+ * opp, else return 0.
+ */
+unsigned int dev_pm_opp_get_avg_bw(struct dev_pm_opp *opp)
+{
+	if (IS_ERR_OR_NULL(opp) || !opp->available) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return 0;
+	}
+
+	return opp->bandwidth->avg;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_avg_bw);
+
+/**
+ * dev_pm_opp_get_peak_bw() - Gets the peak bandwidth corresponding to an
+ * available opp
+ * @opp:	opp for which peak bandwidth has to be returned for
+ *
+ * Return: peak bandwidth read from device tree corresponding to the
+ * opp, else return 0.
+ */
+unsigned int dev_pm_opp_get_peak_bw(struct dev_pm_opp *opp)
+{
+	if (IS_ERR_OR_NULL(opp) || !opp->available) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return 0;
+	}
+
+	return opp->bandwidth->peak;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_peak_bw);
+
 /**
  * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
  * @opp: opp for which turbo mode is being verified
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 80a49d1fa9a8..82ff8e2e1ff7 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -99,6 +99,8 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
 
 unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp);
+unsigned int dev_pm_opp_get_avg_bw(struct dev_pm_opp *opp);
+unsigned int dev_pm_opp_get_peak_bw(struct dev_pm_opp *opp);
 
 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
 
@@ -179,6 +181,16 @@ static inline unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
 	return 0;
 }
 
+static inline unsigned int dev_pm_opp_get_avg_bw(struct dev_pm_opp *opp)
+{
+	return 0;
+}
+
+static inline unsigned int dev_pm_opp_get_peak_bw(struct dev_pm_opp *opp)
+{
+	return 0;
+}
+
 static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
 {
 	return false;
-- 
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