linux-kernel - Re: [PATCH 1/2] ASoC: ssm2602: add device tree bindings

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Date:	Mon, 29 Sep 2014 17:34:53 +0300
From:	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] ASoC: ssm2602: add device tree bindings

On Mon, Sep 29, 2014 at 10:50:24AM +0200, Lars-Peter Clausen wrote:
> On 09/28/2014 09:57 AM, Stefan Kristiansson wrote:
> >Allow the ssm2602/ssm2603/ssm2604 codec driver to be
> >instantiated from the device tree.
> >
> >Also, add Kconfig prompts to allow manual selection of both the
> >I2C and SPI configuration versions of the driver.
> >
> >Signed-off-by: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
> 
> Looks mostly good, but you should Cc both the devicetree and the
> ASoC maintainers.
> 

Ok, I'll make sure to do that in v2.

> [...]
> >diff --git a/sound/soc/codecs/ssm2602-i2c.c b/sound/soc/codecs/ssm2602-i2c.c
> >index abd63d5..0d9779d 100644
> >--- a/sound/soc/codecs/ssm2602-i2c.c
> >+++ b/sound/soc/codecs/ssm2602-i2c.c
> >@@ -41,10 +41,19 @@ static const struct i2c_device_id ssm2602_i2c_id[] = {
> >  };
> >  MODULE_DEVICE_TABLE(i2c, ssm2602_i2c_id);
> >
> >+static const struct of_device_id ssm2602_of_match[] = {
> >+	{ .compatible = "adi,ssm2602", },
> >+	{ .compatible = "adi,ssm2603", },
> >+	{ .compatible = "adi,ssm2604", },
> 
> Since the driver is supposed to behave different depending on the
> device you should set the driver data similar to like it is done in
> the ssm2602_i2c_id table and add code in the probe function to
> extract the driver data.
> 

As far as I understand, that is already covered for, ssm2602_i2c_probe() get
called with the i2c_device_id struct set according to the compatible string.
I.e. if I set it to "adi,ssm2603" in the .dts, ssm2602_i2c_probe() is called
with id->name = "ssm2603" and id->driver_data = 0 and if I set it to
"adi,ssm2604" I get id->name = "ssm2603" and id->driver_data = 1.

However, when looking into that, I noticed this in ssm2602_probe()

	 ssm2602->type = SSM2602;

so the value from id->driver_data is never used.
(it should be ssm2602->type = type;)

I can send a seperate patch that fixes this, but I only have a ssm2603,
so I can't test if it works.

> >+static const struct of_device_id ssm2602_of_match[] = {
> >+	{ .compatible = "adi,ssm2602", },
> >+	{ .compatible = "adi,ssm2603", },
> >+	{ .compatible = "adi,ssm2604", },
> 
> The ssm2603 and ssm2604 do not have a SPI interface.
>

Right, I'll remove those from that list.

Stefan
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