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cpufreq: SPEAr: Instantiate as platform_driver

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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@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2014-03-10 15:43:18 +05:30 committed by Rafael J. Wysocki
parent 96bbbe4a2a
commit 2449d33a40
3 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/mach-spear/spear1310.c
View File

@ -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[] = {

1
arch/arm/mach-spear/spear1340.c
View File

@ -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[] = {

13
drivers/cpufreq/spear-cpufreq.c
View File

@ -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@st.com>");
MODULE_DESCRIPTION("SPEAr CPUFreq driver");