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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