linux-kernel - Re: [PATCH 3/4] pinctrl: remove slew-rate parameter from tz1090

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Date:	Tue, 25 Jun 2013 14:50:49 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Heiko Stübner <heiko@...ech.de>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH 3/4] pinctrl: remove slew-rate parameter from tz1090

On 25/06/13 14:32, Linus Walleij wrote:
> On Tue, Jun 25, 2013 at 3:27 PM, James Hogan <james.hogan@...tec.com> wrote:
>> On 25/06/13 14:21, Heiko Stübner wrote:
> 
>>> My thoughts were that this code would never be reached when the parsing was
>>> removed and to not cause confusion to the driver when an acceptable binding
>>> was found for slew-rate.
>>>
>>> But it of course also doesn't hurt to stay in.
>>
>> Okay, fair enough.
>>
>> Acked-by: James Hogan <james.hogan@...tec.com>
> 
> OK applied this so we have a clean slate.
> 
> Patches adding it back in with SI measures will be welcomed!

Okay.

So the most descriptive documentation I can find for the slew rate in
the TZ1090 pin config hardware is basically:

0: slow (half frequency)
1: fast

Sounds like this pretty much precludes it from having a generic DT
binding unless it can be mapped to some physical value, so I'll add a
tz1090,slew-rate and use PIN_CONFIG_END+1 instead of PIN_CONFIG_SLEW_RATE.

Anybody object to me adding an argument to
pinconf_generic_parse_dt_config() so that an additional
pinconf_generic_dt_params array can be optionally passed in? That way I
can share the generic pinconf dt parsing code.

Cheers
James

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