[alsa-devel] [PATCH v3 6/6] ASoC: zx: add zx296702 hdmi codec

[Jun Nie]

2015-06-03 2:13 GMT+08:00 Mark Brown <broonie at kernel.org>:
> On Mon, Jun 01, 2015 at 09:42:34AM +0800, Jun Nie wrote:
>
>> So I need implement dai link in machine audio card driver, while not
>> use simple card and device tree initialization. In this way, I surely
>> can embed HDMI audio codec in HDMI driver. Is that right?
>
> I'm sorry, I don't entirely follow what you're saying here.
I am guessing you suggest me to implement a ASoC board driver, like
sound/soc/omap/omap3pandora.c. I can link HDMI codec with DAI with
snd_soc_dai_link structure to avoid specify the connection in dts.

>
>> I had try to initialize audio all from dts, so need a HDMI codec dt
>> node to connect with DAI. However, I cannot find a way to create an
>> independent HDMI CODEC dt node because it is brought up from HDMI
>> driver. If my above understanding is correct, a machine level DAI link
>> shall resolve this issue with dropping simple card and DAI link in
>> dts. Thanks for your comments!
>
> If the HDMI encoder is simple I'd expect it to be possible to use it
> with simple-card.  If it isn't then we can look at why.

Most of devices is initialized from devicetree if not all on my board.
So I need fill CODEC/DAI dt node for imple-card in dts. I experience
the difficulty that I cannot create HDMI CODEC dt node. Because HDMI
CODEC shall be part of HDMI driver and be brought up with direct call
to snd_soc_register_codec in HDMI driver probe function per my
understanding. Then I do not have an independent dt node for HDMI
CODEC, thus cannot link the CODEC to DAI with dts information. Do you
see any chance to connect a DAI to an embedded CODEC of HDMI video
device? Thank you!

>
>> BTW: HDMI driver is far from mature, so you did not see HDMI function
>> implementation in this patch serial.
>
> Sure, no problem.