Re: [PATCH 09/11] mmc: omap_hsmmc: enhance pinctrl support

[Balaji T K]

On Tuesday 04 June 2013 08:16 PM, Tony Lindgren wrote:
> * Hebbar Gururaja <gururaja.hebbar@xxxxxx> [130531 03:19]:
> > Amend the hsmmc controller to optionally take a pin control handle and
> > set the state of the pins to:
> >
> > - "default" on boot, resume and before performing a mmc transfer
> > - "idle" after initial default, after resume default, and after each
> > mmc/sd card access
> > - "sleep" on suspend()
> >
> > By optionally putting the pins into sleep state in the suspend callback
> > we can accomplish two things.
> > - One is to minimize current leakage from pins and thus save power,
> > - second, we can prevent the IP from driving pins output in an
> > uncontrolled manner, which may happen if the power domain drops the
> > domain regulator.
> >
> > If any of the above pin states are missing in dt, a warning message
> > about the missing state is displayed.
> > If certain pin-states are not available, to remove this warning message
> > pass respective state name with null phandler.
>
> There's a similar patch in the "[RESEND PATCH v2 1/3] mmc: omap_hsmmc:
> Enable SDIO IRQ using a GPIO in idle mode" thread. It also makes the
> SDIO interrupts to work, so we need to consider that too.

Hi Tony,

I will try to combine both of these and make use of
pinctrl_pm_select_[*]_state helper functions.


> We can merge the dynamic pinmuxing parts separately, but they should
> be in a separate function like I posted later on in the thread above.
>
> Regards,
>
> Tony
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