linux-kernel - Re: [Patch V4] drivers: power: Add support for bq24735 charger

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Message-ID: <524B29EE.4090608@wwwdotorg.org>
Date:	Tue, 01 Oct 2013 14:00:46 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Rhyland Klein <rklein@...dia.com>
CC:	Anton Vorontsov <anton@...msg.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Manish Badarkhe <badarkhe.manish@...il.com>,
	Darbha Sriharsha <dsriharsha@...dia.com>,
	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [Patch V4] drivers: power: Add support for bq24735 charger

On 09/26/2013 10:02 AM, Rhyland Klein wrote:
> From: Darbha Sriharsha <dsriharsha@...dia.com>
> 
> Adds support for the bq24735 charger chipset. The bq24735 is a
> high-efficiency, synchronous battery charger.
> 
> It allows control of the charging current, input current, and the charger
> voltage DAC's through SMBus.

> diff --git a/Documentation/devicetree/bindings/power_supply/ti,bq24735.txt b/Documentation/devicetree/bindings/power_supply/ti,bq24735.txt

> +Optional properties :

> + - ti,charge-current : Used to control and set the charging current. This value
> +   must be between 128mA and 8.128A with a 64mA step resolution. The POR value
> +   is 0x0000h. See spec for more details.
> + - ti,charge-voltage : Used to control and set the charging voltage. This value
> +   must be between 1.024V and 19.2V with a 16mV step resolution. The POR value
> +   is 0x0000h. See spec for more details.
> + - ti,input-current : Used to control and set the charger input current. This
> +   value must be between 128mA and 8.064A with a 128mA step resolution. The
> +   POR value is 0x1000h. See spec for more details.

What units and representation do those properties use? I assume it's mA
and mV, without any shift or register encoding, but the text doesn't
make it clear. It'd be best to reference a specific register name rather
than just saying "see the spec".
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