linux-kernel - Re: [PATCH V2 2/2] gpio: add STA2X11 GPIO block

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Date:	Thu, 1 Mar 2012 19:50:35 +0100
From:	Alessandro Rubini <rubini@...dd.com>
To:	linus.walleij@...aro.org
Cc:	linux-kernel@...r.kernel.org, giancarlo.asnaghi@...com,
	alan@...ux.intel.com, sameo@...ux.intel.com,
	grant.likely@...retlab.ca, linus.walleij@...ricsson.com
Subject: Re: [PATCH V2 2/2] gpio: add STA2X11 GPIO block

>> +       if (cfg == PINMUX_TYPE_FUNCTION) {
> (...)
>> +       case PINMUX_TYPE_OUTPUT_LOW:
> (...)
>> +       case PINMUX_TYPE_OUTPUT_HIGH:
> (...)
>> +       case PINMUX_TYPE_INPUT:
> (...)
>> +       case PINMUX_TYPE_INPUT_PULLUP:
> (...)
>> +       case PINMUX_TYPE_INPUT_PULLDOWN:
> 
> We have created the pin control subsystem to handle things like
> this. (Muxing and complex control.)
> 
> Please create a driver in drivers/pinctrl/pinctrl-sta2x11.c that
> expose both a pinctrl and a GPIOlib interface. The GPIOlib
> interface can call into the pin control portions just fine.

I'm sorry, after digging in it for a while I'm really lost.  This
pinctrl file should be there _instead_ of the gpio file or in addition
to it?  I see tegra has both, but u300 has only one.

Also, this pinctrl depends on CONFIG_EXPERIMENTAL at this point in time.
Is it wise the make the whole sta2x11 thing depend on experimental?

Thanks
/alessandro
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