linux-kernel - Re: [PATCH 2/4] i2c: sunxi: Add Reduced Serial Bus (RSB) DT bindings documentation

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Date:	Tue, 24 Feb 2015 11:37:36 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, linux-i2c@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
	Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH 2/4] i2c: sunxi: Add Reduced Serial Bus (RSB) DT bindings documentation

On Tuesday 24 February 2015 18:29:02 Chen-Yu Tsai wrote:
> 
> +       rsb@...03400 {
> +               compatible = "allwinner,sun8i-a23-rsb";
> +               reg = <0x01f03400 0x400>;
> +               interrupts = <0 39 4>;
> +               clocks = <&apb0_gates 3>;
> +               clock-frequency = <3000000>;
> +               resets = <&apb0_rst 3>;
> +
> +               axp223: pmic@2d {
> +                       compatible = "x-powers,axp223", "x-powers,axp221";
> +                       reg = <0x2d>;
> +                       allwinner,rsb-hw-addr = <0x3e3>;
> +
> +                       /* ... */
> +               };
> +       };

The child node cannot have a 'reg' property if the parent does not
have #address-cells/#size-cells. You should add these as mandatory
properties in the list.

I don't really understand the need for having two addresses (runtime
and hardware). Could the runtime address be configured at runtime?
Alternatively, could you use #address-cells=<2> and put both into
'reg'?

	Arnd
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