linux-kernel - Re: [PATCH v4 2/4] pinctrl: Add pinctrl binding for Broadcom Capri SoCs

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Message-ID: <CACRpkdYyz+zrzt0y135Wcq-yUMhiHOb1ov15+SsnVOcZvad96g@mail.gmail.com>
Date:	Tue, 14 Jan 2014 11:16:45 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Sherman Yin <syin@...adcom.com>
Cc:	Mark Brown <broonie@...nel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Heiko Stübner <heiko@...ech.de>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Christian Daudt <bcm@...thebug.org>,
	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	Matt Porter <matt.porter@...aro.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>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 2/4] pinctrl: Add pinctrl binding for Broadcom Capri SoCs

On Tue, Jan 7, 2014 at 9:45 PM, Sherman Yin <syin@...adcom.com> wrote:
> On 14-01-07 09:15 AM, Linus Walleij wrote:

> Is that what you wanted to see in pinctrl-bindings.txt, or is there
> something else you want to see added to that txt file?  I didn't want to add
> the description of slew-rate arguments there because this is capri-specific.
> I'm not quite sure what else to add.
(...)
> That doc already says bias-pull-up is specified in Ohm, and the specific
> values are chip-specific, so I don't think they should be mentioned there.

You're right, forget about this. I didn't realize the pinctrl bindings doc
was that good...

>>> +Optional Properties (for HDMI pins):
>>> +
>>> +- function:                    String. Specifies the pin mux selection.
>>> Values
>>> +                               must be one of: "alt1", "alt2", "alt3",
>>> "alt4"
>>> +- slew-rate:                   Integer. Controls slew rate.
>>> +                                       0: Standard(100kbps)&
>>> Fast(400kbps) mode
>>> +                                       1: Highspeed (3.4Mbps) mode
>>
>> Hmmmm slew rate is not specifiec in "bps" but rather in
>> something like volts per second. But maybe it's best to keep
>> this value driver-specific.
>
> Right, I think the slew-rates values are capri specific.

OK

Yours,
Linus Walleij
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