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SubjectRe: [PATCH v2] cpufreq: st: enable selective initialization based on the platform
On Wed, 27 Apr 2016, Sudeep Holla wrote:

> The sti-cpufreq does unconditional registration of the cpufreq-dt driver
> which causes issue on an multi-platform build. For example, on Vexpress
> TC2 platform, we get the following error on boot:
>
> cpu cpu0: OPP-v2 not supported
> cpu cpu0: Not doing voltage scaling
> cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table
> for cpu:0, -19
> cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6)
> ...
> arm_big_little: bL_cpufreq_register: Failed registering platform driver:
> vexpress-spc, err: -17
>
> The actual driver fails to initialise as cpufreq-dt is probed
> successfully, which is incorrect. This issue can happen to any platform
> not using cpufreq-dt in a multi-platform build.
>
> This patch adds a check to do selective initialization of the driver.
>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> Fixes: ab0ea257fc58 ("cpufreq: st: Provide runtime initialised driver for ST's platforms")
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> drivers/cpufreq/sti-cpufreq.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> v1->v2:
> - Updated compatible strings as per Lee's confirmation

Acked-by: Lee Jones <lee.jones@linaro.org>

> diff --git a/drivers/cpufreq/sti-cpufreq.c b/drivers/cpufreq/sti-cpufreq.c
> index a9c659f58974..04042038ec4b 100644
> --- a/drivers/cpufreq/sti-cpufreq.c
> +++ b/drivers/cpufreq/sti-cpufreq.c
> @@ -259,6 +259,10 @@ static int sti_cpufreq_init(void)
> {
> int ret;
>
> + if ((!of_machine_is_compatible("st,stih407")) &&
> + (!of_machine_is_compatible("st,stih410")))
> + return -ENODEV;
> +
> ddata.cpu = get_cpu_device(0);
> if (!ddata.cpu) {
> dev_err(ddata.cpu, "Failed to get device for CPU0\n");

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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