linux-kernel - Re: [PATCHv5] support for AD5820 camera auto-focus coil

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Message-ID: <20160602074544.GR26360@valkosipuli.retiisi.org.uk>
Date:	Thu, 2 Jun 2016 10:45:45 +0300
From:	Sakari Ailus <sakari.ailus@....fi>
To:	Pavel Machek <pavel@....cz>
Cc:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	pali.rohar@...il.com, sre@...nel.org,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	aaro.koskinen@....fi, patrikbachan@...il.com, serge@...lyn.com,
	linux-media@...r.kernel.org, mchehab@....samsung.com
Subject: Re: [PATCHv5] support for AD5820 camera auto-focus coil

On Thu, Jun 02, 2016 at 12:08:40AM +0200, Pavel Machek wrote:
> On Wed 2016-06-01 18:24:39, Sakari Ailus wrote:
> > Hi Pavel,
> 
> > > Well, it does not use any dt properties. So there's not really much to
> > > discuss with dt people...
> > > 
> > > Maybe "ad5820" needs to go to list of simple i2c drivers somewhere,
> > > but...
> > 
> > It's an I2C device and it does use a regulator. Not a lot, though, these are
> > both quite basic stuff. This should still be documented as the people who
> > write the DT bindings (in general) aren't expected to read driver code as
> > well. That's at least my understanding.
> 
> Yep, you are right, I forgot about the regulator. Something like this?
> 
> Thanks,
> 									Pavel
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ad5820.txt b/Documentation/devicetree/bindings/media/i2c/ad5820.txt
> new file mode 100644
> index 0000000..87c98f1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/ad5820.txt

I might use the compatible string as such as a part of the file name. Up to
you.

> @@ -0,0 +1,20 @@
> +* Analog Devices AD5820 autofocus coil
> +
> +Required Properties:
> +
> +  - compatible: Must contain "adi,ad5820"
> +
> +  - reg: I2C slave address
> +
> +  - VANA-supply: supply of voltage for VANA pin
> +
> +Example:
> +
> +       /* D/A converter for auto-focus */

There is definitely D/A conversion happening there but I'm not sure I'd
characterise the device as such. They're typically called "voice coil
drivers", perhaps because the devices are similar to a parts of a
loudspeaker.

> +       ad5820: dac@0c {
> +               compatible = "adi,ad5820";
> +               reg = <0x0c>;
> +
> +               VANA-supply = <&vaux4>;
> +       };
> +
> 
> 

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk