linux-kernel - Re: [PATCH v9 3/4] ASoC: tda998x: add a codec to the HDMI transmitter

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Date:	Wed, 7 Jan 2015 15:41:38 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Andrew Jackson <Andrew.Jackson@....com>
Cc:	Jean-Francois Moine <moinejf@...e.fr>,
	Mark Brown <broonie@...nel.org>,
	Dave Airlie <airlied@...il.com>, Jyri Sarha <jsarha@...com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 3/4] ASoC: tda998x: add a codec to the HDMI transmitter

On Wed, Jan 07, 2015 at 03:10:47PM +0000, Andrew Jackson wrote:
> On 01/07/15 10:51, Jean-Francois Moine wrote:
> > diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig
> > index 22c7ed6..24fc975 100644
> > --- a/drivers/gpu/drm/i2c/Kconfig
> > +++ b/drivers/gpu/drm/i2c/Kconfig
> > @@ -28,6 +28,7 @@ config DRM_I2C_SIL164
> >  config DRM_I2C_NXP_TDA998X
> >         tristate "NXP Semiconductors TDA998X HDMI encoder"
> >         default m if DRM_TILCDC
> > +       select SND_SOC_TDA998X
> 
> Do you need this since sound/soc/codecs/Kconfig conditionally brings in the
> CODEC driver?

More importantly, it's broken, because it'll cause Kconfig to complain
if you enable DRM_I2C_NXP_TDA998X, but have ASoC disabled.

Moreover, if you decide you want the sound and ASoC built as a module,
but want to build in DRM and TDA998x support (so you can get video
output working on boot before initramfs/rootfs), Kconfig may well
complain.

> > +static int __init tda998x_codec_init(void)
> > +{
> > +       return 0;
> > +}
> > +static void __exit tda998x_codec_exit(void)
> > +{
> > +}
> > +module_init(tda998x_codec_init);
> > +module_exit(tda998x_codec_exit);

There's no need for these if they remain as the above.  Modules can have
both init/exit functions, or neither, and they are still unloadable.
Only modules which provide only an init function get locked in on load.

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