linux-kernel - Re: [PATCH 4/5] ASoC: dwc: Add devicetree support for Designware I2S

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Date:	Thu, 04 Dec 2014 09:42:13 +0000
From:	Andrew Jackson <Andrew.Jackson@....com>
To:	Mark Brown <broonie@...nel.org>
CC:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rajeev Kumar <rajeevkumar.linux@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Liviu Dudau <Liviu.Dudau@....com>
Subject: Re: [PATCH 4/5] ASoC: dwc: Add devicetree support for Designware
 I2S

On 12/03/14 18:23, Mark Brown wrote:
> On Wed, Dec 03, 2014 at 04:39:08PM +0000, Andrew Jackson wrote:
> 
>> Convert to driver to use either platform_data or device-tree for configuration
>> of the device.  When using device-tree, the I2S block's configuration is read
>> from the relevant registers: this reduces the amount of information required in
>> the device tree.
> 
> This really needs to be split into two or more patches, there's a whole
> bunch of refactoring to support this DT stuff which should be separate
> from the DT addition itself.  Right now it's hard to tell what each
> individual bit of the code is supposed to be doing, the patch is far too
> large and doing far too many individual things.

I will have look at how it might be split.  The majority of the new code is in reading and processing the device's configuration: I didn't want to change the platform data handling to do that because some of the comments in the driver suggested that there were ST specific changes to the Designware IP.  I wasn't in a position to know whether, if I changed the configuration reading, the driver would still function correctly on the SPEAR platform.

>> +	if (dev->using_pd) {
>> +		ret = dev->i2s_clk_cfg(config);
>> +		if (ret < 0) {
>> +			dev_err(dev->dev, "runtime audio clk config fail\n");
>> +			return ret;
>> +		}
>> +	} else {
>> +		u32	bitclk;
> 
> Having this whole separate path for using platform data feels icky, we
> don't want to have completely separate flows like this.  Checking for
> the callbacks being there is probably fine but just having totally
> separate code paths is a bit icky.

I wasn't very happy either but making the test explicit seemed reasonable at the time.  I'll change the code to test for the presence of the callback instead.

	Andrew



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