linux-kernel - Re: [rtc-linux] [PATCH V3 2/3] pincntrl: add support for AMS AS3722 pin control driver

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Date:	Tue, 24 Sep 2013 22:46:47 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Rob Landley <rob@...dley.net>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	Florian Lobmaier <florian.lobmaier@....com>
Subject: Re: [rtc-linux] [PATCH V3 2/3] pincntrl: add support for AMS AS3722
 pin control driver

On Tuesday 24 September 2013 06:22 PM, Linus Walleij wrote:
> On Tue, Sep 24, 2013 at 1:58 PM, Laxman Dewangan <ldewangan@...dia.com> wrote:
>> +static int as_pci_to_irq(struct gpio_chip *chip, unsigned offset)
>> +{
>> +       struct as3722_pctrl_info *as_pci = to_as_pci(chip);
>> +
>> +       return as3722_irq_get_virq(as_pci->as3722, offset);
>> +}
>> +
>> +static int as_pci_request(struct gpio_chip *chip, unsigned offset)
>> +{
>> +       struct as3722_pctrl_info *as_pci = to_as_pci(chip);
>> +
>> +       if (as_pci->gpio_control[offset].io_function)
>> +               return -EBUSY;
>> +       return 0;
>> +}
> Why is this not calling pinctrl_request_gpio(as_pci->chip.base + offset)
> instead of just checking if we happen to be GPIO and failing if
> we are not?
>
> I would implement .free calling pinctrl_free_gpio(gpio) as well.
>
> See e.g. pinctrl-abx500.c
>
>

Wow, cool, I saw and it is simple,  the gpios callback is wrapper over 
the pincontrol mux APIs.

I also see opportunity to re-factor the 
request/free/direction_input/direction_output to move to core so that 
need not to implement locally, the gpio_chip's callback can use directly.

Will post once this driver is accepted.
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