linux-kernel - Re: [alsa-devel] [PATCH v2 1/3] ASoC: codecs: wm8904: add dt ids table

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Date:	Tue, 27 Jan 2015 09:35:13 +0800
From:	Bo Shen <voice.shen@...el.com>
To:	Lars-Peter Clausen <lars@...afoo.de>,
	Mark Brown <broonie@...nel.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	<devicetree@...r.kernel.org>, <alsa-devel@...a-project.org>,
	<linux-kernel@...r.kernel.org>, <linux-sound@...r.kernel.org>,
	"Alexander Morozov" <linux@...tdown.ru>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH v2 1/3] ASoC: codecs: wm8904: add dt ids
 table

Hi Mark, Lars-Perter,

On 01/27/2015 12:49 AM, Lars-Peter Clausen wrote:
> On 01/26/2015 05:42 PM, Mark Brown wrote:
>> On Mon, Jan 26, 2015 at 04:24:38PM +0100, Nicolas Ferre wrote:
>>> Le 16/01/2015 02:17, Bo Shen a écrit :
>>
>>>>> Does this end up in the i2c_driver_id driver data or do we need some
>>>>> extra code when devtype is assigned to check for an of_node and
>>>>> look at
>>>>> the DT data instead?  That certainly used to be the case...
>>
>>>> At the beginning I think as the same as you, and also add the code to
>>>> get the data as I do in <drivers/misc/atmel-ssc.c>. However, as I
>>>> remember, I2C seems only use the compatible string after the comma,
>>>> that
>>>> means only for "wlf,wm8904", it uses "wm8904" to match. So, I remove
>>>> all
>>>> the code I added, and just keep these, and it can get the device type
>>>> correctly.
>>
>>>> So, when I submit the patch and keep the code as simple as possible.
>>
>>> I don't understand what's keeping this patch from being applied. Voice,
>>> do you mind re-sending?
>>
>> I need to convince myself that the above actually works and is doing the
>> right thing; the above explanation sounds like if it works it might be
>> relying on a bug.
>
> I'd call it a undocumented feature. But I wouldn't rely on it being
> around for ever. In my opinion to be future proof the driver should
> explicitly handle the OF case in the probe function.
>

I will add this into probe function in next version.
Thanks.

Best Regards,
Bo Shen
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