linux-kernel - [PATCH V4 4/8] driver/core: cpu: initialize opp table

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Message-Id: <ce68a1ba333ab080a2428242d8fa4d4629064a4d.1401191054.git.viresh.kumar@linaro.org>
Date:	Tue, 27 May 2014 17:20:53 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...ysocki.net
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, arvind.chauhan@....com,
	inderpal.s@...sung.com, nm@...com, chander.kashyap@...aro.org,
	pavel@....cz, len.brown@...el.com, sudeep.holla@....com,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH V4 4/8] driver/core: cpu: initialize opp table

Drivers expecting CPU's OPPs from device tree initialize OPP table themselves by
calling of_init_opp_table() and there is nothing driver specific in that. They
all do it in the same redundant way.

It would be better if we can get rid of redundancy by initializing CPU OPPs from
CPU core code for all CPUs (that have a "operating-points" property defined in
their node).

This patch calls of_init_opp_table() right after CPU device is registered in
register_cpu(). of_init_opp_table() also has a dummy implementation which simply
returns -ENOSYS when CONFIG_OPP or CONFIG_OF isn't supported by some platform.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Amit Daniel Kachhap <amit.daniel@...sung.com>
Cc: Kukjin Kim <kgene.kim@...sung.com>
Cc: Shawn Guo <shawn.guo@...aro.org>
Cc: Sudeep Holla <sudeep.holla@....com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/base/cpu.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 006b1bc..790183f 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -16,6 +16,7 @@
 #include <linux/acpi.h>
 #include <linux/of.h>
 #include <linux/cpufeature.h>
+#include <linux/pm_opp.h>
 
 #include "base.h"
 
@@ -349,10 +350,12 @@ int register_cpu(struct cpu *cpu, int num)
 	if (cpu->hotpluggable)
 		cpu->dev.groups = hotplugable_cpu_attr_groups;
 	error = device_register(&cpu->dev);
-	if (!error)
-		per_cpu(cpu_sys_devices, num) = &cpu->dev;
-	if (!error)
-		register_cpu_under_node(num, cpu_to_node(num));
+	if (error)
+		return error;
+
+	per_cpu(cpu_sys_devices, num) = &cpu->dev;
+	register_cpu_under_node(num, cpu_to_node(num));
+	of_init_opp_table(&cpu->dev);
 
 	return error;
 }
-- 
2.0.0.rc2

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