Re: [EXTERNAL] Re: [PATCH v2 1/3] ALSA: hda/tas2781: Modification for add tas2781 driver for SPI

[Andy Shevchenko]

On Tue, Apr 16, 2024 at 07:45:21AM +0000, Xu, Baojun wrote:
> > From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> > Sent: 09 April 2024 21:02
> > On Tue, Apr 09, 2024 at 10: 48: 13AM +0800, Baojun Xu wrote:
> > On Tue, Apr 09, 2024 at 10:48:13AM +0800, Baojun Xu wrote:

..

> > > @@ -39,6 +39,7 @@ snd-hda-scodec-cs35l56-spi-objs :=  cs35l56_hda_spi.o
> > >  snd-hda-cs-dsp-ctls-objs :=          hda_cs_dsp_ctl.o
> > >  snd-hda-scodec-component-objs :=     hda_component.o
> > >  snd-hda-scodec-tas2781-i2c-objs :=   tas2781_hda_i2c.o
> > > +snd-hda-scodec-tas2781-spi-objs :=   tas2781_hda_spi.o tas2781_spi_fwlib.o
> > 
> > Actually these 'objs' has to be 'y', can you fix it in the prerequisite patch?
> 
> Do you mean set CONFIG_SND_HDA_SCODEC_TAS2781_SPI=y in .config?

No. I mean the Kconfig syntax in use. -objs is for user space tools. Kernel
code should use -y in this case.

> It's m now.
> 
> > Also wondering why fwlib is only a requirement for SPI. How does I²C work?
> 
> Because in I2C mode, one probed device driver will support all devices,
> firmware binary is only one file, include all of devices.
> But in SPI mode, multi driver probed, so we use single firmware binary for
> every spi device.

But does I²C version still need the firmware? Can't the FW handling be factored
out to a single module for both?

-- 
With Best Regards,
Andy Shevchenko