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

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Date:	Fri, 7 Jun 2013 19:06:07 +0530
From:	Balaji T K <balajitk@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Hebbar Gururaja <gururaja.hebbar@...com>, <khilman@...aro.org>,
	<linus.walleij@...aro.org>, <sudhakar.raj@...com>,
	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<vaibhav.bedia@...com>, <linux-omap@...r.kernel.org>,
	Chris Ball <cjb@...top.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 09/11] mmc: omap_hsmmc: enhance pinctrl support

On Tuesday 04 June 2013 08:16 PM, Tony Lindgren wrote:
> * Hebbar Gururaja <gururaja.hebbar@...com> [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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