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

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Date:	Thu, 1 Mar 2012 21:20:18 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Alessandro Rubini <rubini@...dd.com>
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

On Thu, Mar 1, 2012 at 7:50 PM, Alessandro Rubini <rubini@...dd.com> wrote:

>>> +       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.

Instead. Just expose three interfaces from it:

struct gpio_chip
struct irc_chip (iff it supports IRQs)
struct pinctrl_desc

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

Another option is to wait for it to be marked non-experimental
and help fixing it up I guess, we've created it due to
shortcomings in drivers/gpio...

Yours,
Linus Walleij
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