linux-kernel - Re: [PATCH V4 1/3] mfd: add support for ams AS3722 PMIC

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Date:	Tue, 08 Oct 2013 14:38:46 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>, lee.jones@...aro.org,
	sameo@...ux.intel.com, broonie@...nel.org,
	linus.walleij@...aro.org, akpm@...ux-foundation.org
CC:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	rtc-linux@...glegroups.com, rob.herring@...xeda.com,
	mark.rutland@....com, pawel.moll@....com, rob@...dley.net,
	ijc+devicetree@...lion.org.uk, grant.likely@...aro.org,
	Florian Lobmaier <florian.lobmaier@....com>
Subject: Re: [PATCH V4 1/3] mfd: add support for ams AS3722 PMIC

On 10/02/2013 09:50 AM, Laxman Dewangan wrote:
> The ams AS3722 is a compact system PMU suitable for mobile phones,
> tablets etc. It has 4 DC/DC step-down regulators, 3 DC/DC step-down
> controller, 11 LDOs, RTC, automatic battery, temperature and
> over-current monitoring, 8 GPIOs, ADC and a watchdog.

> diff --git a/Documentation/devicetree/bindings/mfd/as3722.txt b/Documentation/devicetree/bindings/mfd/as3722.txt

> +  The first cell is the IRQ number.

Which IRQ number exist? Perhaps the IRQ IDs match some specific HW register?

> +Pinmux and GPIO:

> +- pinctrl-names: A pinctrl state named "default" must be defined, using the
> +		bindings in pinctrl/pinctrl-binding.txt.

Why is the DT required to define a default state? If the board doesn't
need to set up any pinctrl settings, surely it shouldn't have to define
the default state.

> +- pinctrl[0...n]: Nodes for pin control to represents state 0 to state n.

These aren't nodes. Those are properties that contain phandles that
refer to nodes.

> +	Each of these nodes contains different subnodes to represents
> +	some desired configuration for a list of pins. This configuration can
> +	include the mux function to select on those pin(s), and various pin
> +	configuration parameters, such as pull-up, open drain.

What contains "these nodes"?

> +
> +Each subnode have following properties:
> +Required properties:
> +	pins: List of pins. Valid options for pins properties are
> +		gpio0, gpio1, gpio2, gpio3, gpio4, gpio5, gpio6, gpio7
> +
> +Optional properties:
> +	Optional properties are

Why repeat that?

> +		function, bias-disable, bias-pull-up, bias-pull-down,
> +		bias-high-impedance, drive-open-drain.
> +
> +		Valid options for funtion properties are:

s/funtion/function/

I would say "values" not "options", as I think I pointed out before, but
I supopse I don't care.

> +Optional sub nodes:

The following might make it clear where these optional nodes sit:

Optional sub nodes of "regulators":
-----------------------------------

> +	Additional custom properties  are listed below.

Required or optional?

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