[PATCH v4] pinctrl: mediatek: Implement wake handler and suspend resume

[maoguang meng]

On Wed, 2015-09-02 at 14:02 +0800, Daniel Kurtz wrote:
> Hi maoguang,
> 
> On Tue, Aug 25, 2015 at 12:27 AM, Sudeep Holla <sudeep.holla at arm.com> wrote:
> >
> >
> > On 14/08/15 09:38, maoguang.meng at mediatek.com wrote:
> >>
> >> From: Maoguang Meng <maoguang.meng at mediatek.com>
> >>
> >> This patch implement irq_set_wake to get who is wakeup source and
> >> setup on suspend resume.
> >>
> >> Signed-off-by: Maoguang Meng <maoguang.meng at mediatek.com>
> >>
> [snip]
> 
> Can you please respond to Sudeep's questions:
> 
> > Does this pinmux controller:
> >
> > 1. Support wake-up configuration ? If not, you need to use
> >    IRQCHIP_SKIP_SET_WAKE. I don't see any value in writing the
> >    mask_{set,clear} if the same registers are used for {en,dis}able

  YES.
  we can call enable_irq_wake(irq) to config this irq as a wake-up
source.

> >
> > 2. Is in always on domain ? If not, you need save/restore only to
> >    resume back the functionality. Generally we can set
> >    IRQCHIP_MASK_ON_SUSPEND to ensure non-wake-up interrupts are
> >    disabled during suspend and re-enabled in resume path. You just
> >    save/restore raw values without tracking the wake-up source.

  YES.

> >
> > Also I see that no care is taken to set the port irq as wake enable
> > source. It may work with current mainline, but won't with -next. Please
> > ensure the port irq to the parent interrupt controller remains
> > enabled(i.e set as wake).

As you know, we do not care the port irq as wake enbale source,
when enter suspend we think no matter what the port irq is
enabled/disabled which are not affected as a wake-up source,
Because eint has a line to receive SPM.

For example,after suspend,press power key(use eint5) will generate an
electrical signal which is send to spm by eint.
and then spm wake cpu.
  
> >
> > Regards,
> > Sudeep

Regards,
Maoguang