linux-kernel - Re: [PATCH RESEND 2/5] pinctrl: berlin: add a pinctrl driver for Marvell Berlin SoCs

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Date:	Tue, 22 Apr 2014 14:52:10 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Antoine Ténart <antoine.tenart@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	zmxu@...vell.com, Jisheng Zhang <jszhang@...vell.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND 2/5] pinctrl: berlin: add a pinctrl driver for
 Marvell Berlin SoCs

On Fri, Apr 11, 2014 at 3:35 PM, Sebastian Hesselbarth
<sebastian.hesselbarth@...il.com> wrote:
> On 04/11/2014 02:37 PM, Antoine Ténart wrote:
>> On Fri, Apr 11, 2014 at 11:03:48AM +0200, Sebastian Hesselbarth wrote:
>>> On 04/10/2014 03:07 PM, Antoine Ténart wrote:

>>> Having said that, the above assumes that each function is unique
>>> but IIRC the idea of the function table was to group pins/groups
>>> with the same function, e.g. function "gpio", groups 1,7,25,...
>>
>> Most of the functions you can use on the Berlin they will be unique and
>> would
>> only be used in one group, except for the 'gpio' one.
>
> Yeah, I had a similar discussion about it back then for mvebu. IIRC, the
> correct answer is: Have a list of functions with groups assigned to it
> no matter if there is only one group per function (or 40 per function as
> it will be for gpio).
>
> Maybe Linus can give an update on how to deal with it?

Have you considered implementing pinmux_ops
.gpio_request_enable(), .gpio_set_direction() and
.gpio_disable_free() instead of defining groups for each
and every GPIO?

Yours,
Linus Walleij
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