2015-06-03 19:01 GMT+08:00 Mark Brown broonie@kernel.org:
On Wed, Jun 03, 2015 at 09:47:46AM +0800, Jun Nie wrote:
2015-06-03 2:13 GMT+08:00 Mark Brown broonie@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.
You can do that if you like, but it's also fine to show the link between the S/PDIF and HDMI IPs in DT if you like.
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!
Are you saying that the HDMI IP doesn't appear in DT at all? If the HDMI IP appears in DT it should be possible to reference it.
Thanks for confirmation. Seems I have much to learn in DT. Will create a CODEC device in HDMI display driver and feed HDMI device to simple card as below to have a try. Thanks! Do you think other patches are OK to merge except the two HDMI patches?
hdmi: hdmi@0x12340000 { compatible = "zte,zx296702-hdmi"; reg = <0x12340000 0x1000>; };
sound { compatible = "simple-audio-card"; simple-audio-card,name = "zx296702_snd"; simple-audio-card,cpu { sound-dai = <&spdif0>; };
simple-audio-card,codec { sound-dai = <&hdmi>; }; };