linux-kernel - Re: [PATCH v3 4/6] pinctrl: Add pinctrl binding for Broadcom Capri SoCs

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Date:	Thu, 12 Dec 2013 21:37:36 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Sherman Yin <syin@...adcom.com>
Cc:	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 v3 4/6] pinctrl: Add pinctrl binding for Broadcom Capri SoCs

On Wed, Dec 11, 2013 at 7:37 PM, Sherman Yin <syin@...adcom.com> wrote:

> Adds pinctrl driver devicetree binding for Broadcom Capri (BCM281xx) SoCs.
>
> Signed-off-by: Sherman Yin <syin@...adcom.com>
> Reviewed-by: Christian Daudt <bcm@...thebug.org>
> Reviewed-by: Matt Porter <matt.porter@...aro.org>
> ---
> v3: Use generic pin config properties instead of brcm-specific ones.  Clarified
>     pin types (standard, i2c, hdmi).
> v2: Use hyphens instead of underscore in DT property names.

Overall this is very nice!

> +- bias-pull-up:                        Integer. Pull up strength in Ohm:
> +                                       1: 1.2 kOhm
> +                                       2: 1.8 kOhm
> +                                       3: 720 Ohm
> +                                       4: 2.7 kOhm
> +                                       5: 831 Ohm
> +                                       6: 1.08 kOhm
> +                                       7: 568 Ohm

Please do not use these custom enumerators 1 thru 7.
Instead say that the argument is given in ohms, so for
example:

bias-pull-up = <12000>;

Then translate this into the proper enumerator in your
driver instead.

No full example provided in the binding! This needs to
be there for understanding.

Yours,
Linus Walleij
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