linux-kernel - [PATCH v1 6/9] interconnect: Add OPP table support for interconnects

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Date:   Fri,  7 Jun 2019 21:43:36 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        vincent.guittot@...aro.org, bjorn.andersson@...aro.org,
        amit.kucheria@...aro.org, seansw@....qualcomm.com,
        daidavid1@...eaurora.org, evgreen@...omium.org,
        sibis@...eaurora.org, kernel-team@...roid.com,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 6/9] interconnect: Add OPP table support for interconnects

Interconnect paths can have different performance points. Now that OPP
framework supports bandwidth OPP tables, add OPP table support for
interconnects.

Devices can use the interconnect-opp-table DT property to specify OPP
tables for interconnect paths. And the driver can obtain the OPP table for
an interconnect path by calling icc_get_opp_table().

Signed-off-by: Saravana Kannan <saravanak@...gle.com>
---
 drivers/interconnect/core.c  | 27 ++++++++++++++++++++++++++-
 include/linux/interconnect.h |  7 +++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 871eb4bc4efc..881bac80bc1e 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -47,6 +47,7 @@ struct icc_req {
  */
 struct icc_path {
 	size_t num_nodes;
+	struct opp_table *opp_table;
 	struct icc_req reqs[];
 };
 
@@ -313,7 +314,7 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
 {
 	struct icc_path *path = ERR_PTR(-EPROBE_DEFER);
 	struct icc_node *src_node, *dst_node;
-	struct device_node *np = NULL;
+	struct device_node *np = NULL, *opp_node;
 	struct of_phandle_args src_args, dst_args;
 	int idx = 0;
 	int ret;
@@ -381,10 +382,34 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
 		dev_err(dev, "%s: invalid path=%ld\n", __func__, PTR_ERR(path));
 	mutex_unlock(&icc_lock);
 
+	opp_node = of_parse_phandle(np, "interconnect-opp-table", idx);
+	if (opp_node) {
+		path->opp_table = dev_pm_opp_of_find_table_from_node(opp_node);
+		of_node_put(opp_node);
+	}
+
+
 	return path;
 }
 EXPORT_SYMBOL_GPL(of_icc_get);
 
+/**
+ * icc_get_opp_table() - Get the OPP table that corresponds to a path
+ * @path: reference to the path returned by icc_get()
+ *
+ * This function will return the OPP table that corresponds to a path handle.
+ * If the interconnect API is disabled, NULL is returned and the consumer
+ * drivers will still build. Drivers are free to handle this specifically, but
+ * they don't have to.
+ *
+ * Return: opp_table pointer on success. NULL is returned when the API is
+ * disabled or the OPP table is missing.
+ */
+struct opp_table *icc_get_opp_table(struct icc_path *path)
+{
+	return path->opp_table;
+}
+
 /**
  * icc_set_bw() - set bandwidth constraints on an interconnect path
  * @path: reference to the path returned by icc_get()
diff --git a/include/linux/interconnect.h b/include/linux/interconnect.h
index dc25864755ba..0c0bc55f0e89 100644
--- a/include/linux/interconnect.h
+++ b/include/linux/interconnect.h
@@ -9,6 +9,7 @@
 
 #include <linux/mutex.h>
 #include <linux/types.h>
+#include <linux/pm_opp.h>
 
 /* macros for converting to icc units */
 #define Bps_to_icc(x)	((x) / 1000)
@@ -28,6 +29,7 @@ struct device;
 struct icc_path *icc_get(struct device *dev, const int src_id,
 			 const int dst_id);
 struct icc_path *of_icc_get(struct device *dev, const char *name);
+struct opp_table *icc_get_opp_table(struct icc_path *path);
 void icc_put(struct icc_path *path);
 int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw);
 
@@ -49,6 +51,11 @@ static inline void icc_put(struct icc_path *path)
 {
 }
 
+static inline struct opp_table *icc_get_opp_table(struct icc_path *path)
+{
+	return NULL;
+}
+
 static inline int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
 {
 	return 0;
-- 
2.22.0.rc2.383.gf4fbbf30c2-goog