From: Viresh Kumar <viresh.kumar@linaro.org>
To: rjw@rjwysocki.net
Cc: linaro-kernel@lists.linaro.org, cpufreq@vger.kernel.org,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
joshc@codeaurora.org, robherring2@gmail.com,
Viresh Kumar <viresh.kumar@linaro.org>
Subject: [PATCH] cpufreq: SPEAr: Instantiate as platform_driver
Date: Mon, 10 Mar 2014 15:43:18 +0530 [thread overview]
Message-ID: <92837e0c0ed734bb82d3c7d78f58beb31b4e0c1f.1394446335.git.viresh.kumar@linaro.org> (raw)
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>
---
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@st.com>");
MODULE_DESCRIPTION("SPEAr CPUFreq driver");
--
1.7.12.rc2.18.g61b472e
next reply other threads:[~2014-03-10 10:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 10:13 Viresh Kumar [this message]
2014-03-11 1:04 ` [PATCH] cpufreq: SPEAr: Instantiate as platform_driver Rafael J. Wysocki
2014-03-11 3:46 ` Viresh Kumar
2014-03-11 12:44 ` Rafael J. Wysocki
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