linux-kernel - [PATCH V2 01/30] OPP: Track if clock name is configured by platform

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Date:   Fri,  1 Jul 2022 13:49:56 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2 01/30] OPP: Track if clock name is configured by platform

Track if the clock name is configured by the platform or not. This is a
preparatory change and will be used by later commits. This also makes
the behavior of the clkname API similar to other ones, which allow
repeated calls to the same API for each CPU.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/opp/core.c | 7 +++++++
 drivers/opp/opp.h  | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index b2715950e76d..e166bfe5fc90 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2277,6 +2277,10 @@ struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
 		goto err;
 	}
 
+	/* Another CPU that shares the OPP table has set the clkname ? */
+	if (opp_table->clk_configured)
+		return opp_table;
+
 	/* clk shouldn't be initialized at this point */
 	if (WARN_ON(opp_table->clk)) {
 		ret = -EBUSY;
@@ -2291,6 +2295,8 @@ struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
 		goto err;
 	}
 
+	opp_table->clk_configured = true;
+
 	return opp_table;
 
 err:
@@ -2311,6 +2317,7 @@ void dev_pm_opp_put_clkname(struct opp_table *opp_table)
 
 	clk_put(opp_table->clk);
 	opp_table->clk = ERR_PTR(-EINVAL);
+	opp_table->clk_configured = false;
 
 	dev_pm_opp_put_opp_table(opp_table);
 }
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 45e3a55239a1..9e1cfcb0ea98 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -149,6 +149,7 @@ enum opp_table_access {
  * @supported_hw: Array of version number to support.
  * @supported_hw_count: Number of elements in supported_hw array.
  * @prop_name: A name to postfix to many DT properties, while parsing them.
+ * @clk_configured: Clock name is configured by the platform.
  * @clk: Device's clock handle
  * @regulators: Supply regulators
  * @regulator_count: Number of power supply regulators. Its value can be -1
@@ -200,6 +201,7 @@ struct opp_table {
 	unsigned int *supported_hw;
 	unsigned int supported_hw_count;
 	const char *prop_name;
+	bool clk_configured;
 	struct clk *clk;
 	struct regulator **regulators;
 	int regulator_count;
-- 
2.31.1.272.g89b43f80a514