Re: [Patch v3 3/4] power_supply: tps65090-charger: Add binding doc

[Stephen Warren <swarren@wwwdotorg.org>]

On 03/12/2013 04:08 PM, Rhyland Klein wrote:
> This change adds the binding documentation for the tps65090-charger.

> diff --git a/Documentation/devicetree/bindings/power_supply/tps65090.txt b/Documentation/devicetree/bindings/power_supply/tps65090.txt

> +Example:
> +
> +	tps65090@48 {
> +		compatible = "ti,tps65090";
> +		reg = <0x48>;
> +		interrupts = <0 88 0x4>;
> +
> +		ti,enable-low-current-chrg;
> +
> +		regulators {
> +			...
> +		};

I'm a little confused by this binding.

What goes in the regulators sub-node; is that specified by another
binding file in bindings/regulator/tps65090.txt?

I would expect one of the following:

1) A single binding file that describes absolutely everything in the
chip. In this case, the main TPS65909 node wouldn't have child nodes for
the MFD components, although the regulators sub-node, which in turn
contains children does still make sense.

2) A separate binding for each component block, and perhaps also some
top-level binding that indicates which child bindings can "plug into"
it. In this case, I'd expect each block to be represented as a sub-node
in DT. The overall regulator component might then still have a
regulators child DT node itself, to represent each regulator's
configuration. In this scenario, each binding document describes the
entirety of a single node.

I think what you've got here is a hybrid; a single top-level node, but
different binding documents defining the various properties that are
relevant to each component block in the device. That seems odd to me.