On Monday, March 10, 2014 03:43:18 PM Viresh Kumar wrote:
> 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@xxxxxxxxxxxxxx>
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Whoever maintains the SPEAr platform, I need an ACK from that person in order
to take this patch.
> ---
> 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@xxxxxx>");
> MODULE_DESCRIPTION("SPEAr CPUFreq driver");
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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