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

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Message-ID: <54B866B9.8000900@atmel.com>
Date:	Fri, 16 Jan 2015 09:17:45 +0800
From:	Bo Shen <voice.shen@...el.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<nicolas.ferre@...el.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<alsa-devel@...a-project.org>, <linux-sound@...r.kernel.org>,
	"Alexander Morozov" <linux@...tdown.ru>
Subject: Re: [PATCH v2 1/3] ASoC: codecs: wm8904: add dt ids table

Hi Mark,

On 01/15/2015 07:54 PM, Mark Brown wrote:
> On Mon, Dec 15, 2014 at 11:31:11AM +0800, Bo Shen wrote:
>
>> +#ifdef CONFIG_OF
>> +static enum wm8904_type wm8904_data = WM8904;
>> +static enum wm8904_type wm8912_data = WM8912;
>> +
>> +static const struct of_device_id wm8904_of_match[] = {
>> +	{
>> +		.compatible = "wlf,wm8904",
>> +		.data = &wm8904_data,
>
> 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.

Thanks.

Best Regards,
Bo Shen

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