linux-kernel - Re: [PATCH v1 1/4] ASoC: codecs: pcm179x: Add PCM1789 id

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Date:   Thu, 1 Mar 2018 08:43:15 +0100
From:   Mylène Josserand <mylene.josserand@...tlin.com>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alexandre.belloni@...tlin.com
Subject: Re: [PATCH v1 1/4] ASoC: codecs: pcm179x: Add PCM1789 id

Hello,

Thank you for the review.

On Tue, 27 Feb 2018 22:51:40 +0100
Thomas Petazzoni <thomas.petazzoni@...tlin.com> wrote:

> Hello,
> 
> On Tue, 27 Feb 2018 22:24:30 +0100, Mylène Josserand wrote:
> > To prepare the support for the PCM1789, add a new compatible
> > and use the i2c_id to handle, later, the differences between
> > these two DACs even if they are pretty similar.
> > 
> > Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
> > ---
> >  Documentation/devicetree/bindings/sound/pcm179x.txt | 2 +-  
> 
> The DT binding change should be in a separate patch.
> 
> >  sound/soc/codecs/pcm179x-i2c.c                      | 6 ++++--
> >  sound/soc/codecs/pcm179x.c                          | 3 ++-
> >  sound/soc/codecs/pcm179x.h                          | 8 +++++++-  
> 
> And this should be together with the PCM1789 support patch. Otherwise
> your series is not bisectable: if we apply only PATCH 1/4, the driver
> supports the new compatible string, but it doesn't have the actual code
> to handle PCM1789. Am I missing something here ?

No, you are right, I will merge it with patch 02.

> 
> > -	return pcm179x_common_init(&client->dev, regmap);
> > +	return pcm179x_common_init(&client->dev, regmap, id->driver_data);  
> 
> This can be done in a preparation patch.
> 
> >  }
> >  
> >  static const struct of_device_id pcm179x_of_match[] = {
> >  	{ .compatible = "ti,pcm1792a", },
> > +	{ .compatible = "ti,pcm1789", },
> >  	{ }
> >  };
> >  MODULE_DEVICE_TABLE(of, pcm179x_of_match);
> >  
> >  static const struct i2c_device_id pcm179x_i2c_ids[] = {
> > -	{ "pcm179x", 0 },
> > +	{ "pcm179x", PCM179X },  
> 
> And also this addition.
> 
> > +	{ "pcm1789", PCM1789 },
> >  	{ }
> >  };
> >  MODULE_DEVICE_TABLE(i2c, pcm179x_i2c_ids);
> > diff --git a/sound/soc/codecs/pcm179x.c b/sound/soc/codecs/pcm179x.c
> > index 4b311c06f97d..81cbf09319f6 100644
> > --- a/sound/soc/codecs/pcm179x.c
> > +++ b/sound/soc/codecs/pcm179x.c
> > @@ -218,7 +218,8 @@ static const struct snd_soc_component_driver soc_component_dev_pcm179x = {
> >  	.non_legacy_dai_naming	= 1,
> >  };
> >  
> > -int pcm179x_common_init(struct device *dev, struct regmap *regmap)
> > +int pcm179x_common_init(struct device *dev, struct regmap *regmap,
> > +			enum pcm17xx_type type)  
> 
> And this done.
> 
> >  {
> >  	struct pcm179x_private *pcm179x;
> >  
> > diff --git a/sound/soc/codecs/pcm179x.h b/sound/soc/codecs/pcm179x.h
> > index cf8681c9a373..8c08689e3b8b 100644
> > --- a/sound/soc/codecs/pcm179x.h
> > +++ b/sound/soc/codecs/pcm179x.h
> > @@ -17,11 +17,17 @@
> >  #ifndef __PCM179X_H__
> >  #define __PCM179X_H__
> >  
> > +enum pcm17xx_type {
> > +	PCM179X,  
> 
> And this one.
> 
> > +	PCM1789,
> > +};
> > +
> >  #define PCM1792A_FORMATS (SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S24_LE | \
> >  			  SNDRV_PCM_FMTBIT_S16_LE)
> >  
> >  extern const struct regmap_config pcm179x_regmap_config;
> >  
> > -int pcm179x_common_init(struct device *dev, struct regmap *regmap);
> > +int pcm179x_common_init(struct device *dev, struct regmap *regmap,
> > +			enum pcm17xx_type type);  
> 
> And this one. Just as a "preparation patch" to support multiple codecs
> in the existing pcm179x.c driver.
> 
> Thanks!
> 
> Thomas

Thanks,

Mylène

-- 
Mylène Josserand, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com