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

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Date:	Thu, 16 Feb 2012 20:16:36 +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, Feb 16, 2012 at 2:00 PM, Alessandro Rubini <rubini@...dd.com> wrote:

> +/*
> + * Special method: alternate functions and pullup/pulldown. This will
> + * need to be exported to other drivers, adding a way to retrieve
> + * the gsta_gpio structure from their own pci device
> + */
> +void gsta_set_config(struct gsta_gpio *chip, int nr, unsigned cfg)
> +{
(...)
> +       if (cfg == PINMUX_TYPE_NONE)
(...)
> +       if (cfg == PINMUX_TYPE_FUNCTION)
(...)
> +       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.

We've had some refactoring in the pin control subsystem recently
so check linux-next for the latest API. The documentation in
Documentation/pinctrl.txt should be pretty uptodate, else
tell me!

I'm giving a talk about pin control at ELC tomorrow, mail
me if you want a copy of the slides!

Yours,
Linus Walleij
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