linux-kernel - Re: [PATCH v2] mfd: DT bindings for the palmas family MFD

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Message-ID: <51AF71CA.8060808@wwwdotorg.org>
Date:	Wed, 05 Jun 2013 11:13:46 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	J Keerthy <j-keerthy@...com>
CC:	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org,
	broonie@...nsource.wolfsonmicro.com, rob.herring@...xeda.com,
	rob@...dley.net, sameo@...ux.intel.com, wim@...ana.be,
	lgirdwood@...il.com, gg@...mlogic.co.uk, t-kristo@...com,
	lee.jones@...aro.org, Ian Lartey <ian@...mlogic.co.uk>
Subject: Re: [PATCH v2] mfd: DT bindings for the palmas family MFD

On 06/04/2013 02:41 AM, J Keerthy wrote:
> From: Graeme Gregory <gg@...mlogic.co.uk>
> 
> Add the various binding files for the palmas family of chips. There is a
> top level MFD binding then a seperate binding for regulators IP blocks on chips.

> diff --git a/Documentation/devicetree/bindings/mfd/palmas.txt b/Documentation/devicetree/bindings/mfd/palmas.txt

> +Optional properties:
> +  ti,mux_padX : set the pad register X (1-2) to the correct muxing for the
> +  		hardware, if not set will use muxing in OTP.
> +
> +Example:
...
> +	ti,mux-pad1 = <0>;
> +	ti,mux-pad2 = <0>;

Use of - vs. _ is inconsistent there. It should be -.

> diff --git a/Documentation/devicetree/bindings/regulator/palmas-pmic.txt b/Documentation/devicetree/bindings/regulator/palmas-pmic.txt

> +Optional nodes:
> +- regulators : should contain the constrains and init information for the
> +	       regulators. It should contain a subnode per regulator from the
> +	       list.

I would re-phrase that as:

Must contain a sub-node per regulator from the list below. Each sub-node
should contain the constraints and initialization information for that
regulator. See regulator.txt for a description of standard properties
for these sub-nodes. Additional custom properties  are listed below.

> +	       For ti,palmas-pmic - smps12, smps123, smps3 depending on OTP,
> +	       smps45, smps457, smps7 depending on varient, smps6, smps[8-10],

typo: s/varient/variant/.

> +	       ldo[1-9], ldoln, ldousb

nit: s/$/./ ?

> +
> +	       optional chip specific regulator fields :-

Perhaps "Optional sub-node properties:"?

> +pmic {
> +	compatible = "ti,twl6035-pmic", "ti,palmas-pmic";
> +	interrupt-parent = <&palmas>;
> +	interrupts = <14 IRQ_TYPE_NONE>;
> +	interrupt-name = "short-irq";

If those are required, shouldn't they be listed in a "Required
properties" section above? In particular, the order of entries in the
interrupts property must be defined, as well as the expected nameds in
the interrupt-name property.

Oh, and it's interrupt-names not interrupt-name.

Oh, one question though: How does the regulator driver determine the
register address of the regulator sub-device within the overall PMIC?
Presumably if these are pluggable independent modules, that could change
depending on which overall chip the PMIC device is plugged into. don't
you need a reg property to specify that?

Aside from those comments, this all looks reasonable to me.
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