linux-kernel - [PATCH] cpufreq: SPEAr: Instantiate as platform

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Date:	Mon, 10 Mar 2014 15:43:18 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...ysocki.net
Cc:	linaro-kernel@...ts.linaro.org, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	joshc@...eaurora.org, robherring2@...il.com,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH] cpufreq: SPEAr: Instantiate as platform_driver

As multiplatform build is being adopted by more and more ARM platforms, initcall
function should be used very carefully. For example, when SPEAr cpufreq driver
is enabled on a kernel booted on a non-SPEAr board, we will get following boot
time error:

	spear_cpufreq: Invalid cpufreq_tbl

To eliminate this undesired the effect, the patch changes SPEAr driver to have
it instantiated as a platform_driver. Then it will only run on platforms that
create the platform_device "spear-cpufreq".

This patch also creates platform node for SPEAr13xx boards.

Reported-by: Josh Cartwright <joshc@...eaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 arch/arm/mach-spear/spear1310.c |  1 +
 arch/arm/mach-spear/spear1340.c |  1 +
 drivers/cpufreq/spear-cpufreq.c | 13 +++++++++++--
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-spear/spear1310.c b/arch/arm/mach-spear/spear1310.c
index 7ad0030..824b12a 100644
--- a/arch/arm/mach-spear/spear1310.c
+++ b/arch/arm/mach-spear/spear1310.c
@@ -28,6 +28,7 @@
 static void __init spear1310_dt_init(void)
 {
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	platform_device_register_simple("spear-cpufreq", -1, NULL, 0);
 }
 
 static const char * const spear1310_dt_board_compat[] = {
diff --git a/arch/arm/mach-spear/spear1340.c b/arch/arm/mach-spear/spear1340.c
index 3fb6834..7b6bff7 100644
--- a/arch/arm/mach-spear/spear1340.c
+++ b/arch/arm/mach-spear/spear1340.c
@@ -143,6 +143,7 @@ static void __init spear1340_dt_init(void)
 {
 	of_platform_populate(NULL, of_default_bus_match_table,
 			spear1340_auxdata_lookup, NULL);
+	platform_device_register_simple("spear-cpufreq", -1, NULL, 0);
 }
 
 static const char * const spear1340_dt_board_compat[] = {
diff --git a/drivers/cpufreq/spear-cpufreq.c b/drivers/cpufreq/spear-cpufreq.c
index 410b54a..4cfdcff 100644
--- a/drivers/cpufreq/spear-cpufreq.c
+++ b/drivers/cpufreq/spear-cpufreq.c
@@ -19,6 +19,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 
@@ -166,7 +167,7 @@ static struct cpufreq_driver spear_cpufreq_driver = {
 	.attr		= cpufreq_generic_attr,
 };
 
-static int spear_cpufreq_driver_init(void)
+static int spear_cpufreq_probe(struct platform_device *pdev)
 {
 	struct device_node *np;
 	const struct property *prop;
@@ -234,7 +235,15 @@ out_put_node:
 	of_node_put(np);
 	return ret;
 }
-late_initcall(spear_cpufreq_driver_init);
+
+static struct platform_driver spear_cpufreq_platdrv = {
+	.driver = {
+		.name	= "spear-cpufreq",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= spear_cpufreq_probe,
+};
+module_platform_driver(spear_cpufreq_platdrv);
 
 MODULE_AUTHOR("Deepak Sikri <deepak.sikri@...com>");
 MODULE_DESCRIPTION("SPEAr CPUFreq driver");
-- 
1.7.12.rc2.18.g61b472e

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