[PATCH V2] ARM: imx: add cpufreq support for i.mx6sx

[Shawn Guo]

On Wed, Jun 25, 2014 at 10:23:01PM -0300, Fabio Estevam wrote:
> Hi Anson,
> 
> On Wed, Jun 25, 2014 at 6:10 AM, Anson Huang <b20788 at freescale.com> wrote:
> > Add cpufreq support for i.MX6SX, using common
> > i.MX6Q cpufreq driver.
> >
> > Signed-off-by: Anson Huang <b20788 at freescale.com>
> > ---
> >  arch/arm/mach-imx/mach-imx6sx.c |    3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/arch/arm/mach-imx/mach-imx6sx.c b/arch/arm/mach-imx/mach-imx6sx.c
> > index 74ff7d6..9221e1d 100644
> > --- a/arch/arm/mach-imx/mach-imx6sx.c
> > +++ b/arch/arm/mach-imx/mach-imx6sx.c
> > @@ -42,6 +42,9 @@ static void __init imx6sx_init_irq(void)
> >  static void __init imx6sx_init_late(void)
> >  {
> >         imx6q_cpuidle_init();
> > +
> > +       if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ))
> > +               platform_device_register_simple("imx6q-cpufreq", -1, NULL, 0);
> >  }
> 
> With this patch applied I get a flood of these messages:
> 
> cpu cpu0: failed to scale vddpu up: -22
> cpufreq: __target_index: Failed to change cpu frequency: -22
> cpu cpu0: failed to scale vddpu up: -22
> cpufreq: __target_index: Failed to change cpu frequency: -22
> cpu cpu0: failed to scale vddpu up: -22
> cpufreq: __target_index: Failed to change cpu frequency: -22

So it's because the driver change for imx6sx hasn't been in place.  I
just dropped the patch from my branch for now, and will revisit later
when driver part shows up on my branch.  (Unfortunately, that will be
next cycle).

Shawn