I need audio driver or patch for WM8974 interface with IMX6sl custom board based on IMX6SL EVK. Kindle give any suggestions .
Thanks and regards,
There is already the codec driver for WM8974 in the kernel. Depending
on how the chip is connected you will need to implement a machine
driver for your board. Take a look at the imx-wm8962.c which implements
the driver for wm8962 connected to ssi ports. If your wm8974 is also
connected to ssi, you can modify this driver. There are also things you need
to consider differently if your chip is connected as master or slave. How
the driver will look like really depends on your design. If you like to share
your design, you might be able to get more specific help.
Hope this helps
Thanks for your valuable comment. yes i had codec driver for wm8974.But i need platform and machine driver for wm8974. As you said, i can modify the imx-wm8962.c and create imx-wm8974.c . I attached the design side of the wm8974 in this post.Please find it.
According to this attached snapshot wm8974 seems to be connected
as slave. In the reference board wm8962 is also connected as slave
so this is similar. Your snapshot does not show exactly how your
chip is connected to your SoC but assume it is on audmux. If this
is the case you should be able to modify imx-wm8962.c to create
your own machine driver. Probably the best thing for you to do
is to compare wm8962 and wm8974 data sheets and your
design to that of the sabre sd reference board. Based on
differences modify wm8962 to fit to your design. You can
then use the correct dts descriptions and this is pretty much
all you should need for having this chip supported on your
Just a correction: imx-wm8962 sets the wm8962 codec as master and ssi as slave.
Hi Fabio, thanks much setting this right.
I have SPF-27516 and I think the arrows
towards wm8962 on AUD_MCLK and
AUD3_TXC signal lines misled me at a
quick glance. Yes imx-wm8962.c clearly sets
the clocks via snd_soc_dai_set_pll(codec_dai, ...).
Thanks for the correction again.
Hi sinan and Fabio,
Thanks for your comments. And i had not experience in audio codec driver ad machine driver. Lastly, can i modify the imx-wm8962.c and create imx-wm8974. can you help to do the job. I also attached the other side of the AUDIO mux of the processor.
Thanks and Regards,
You can start with MX53UG.pdf Chapter 21: Porting Audio Codecs to a Custom Board.
Next step is to make a change for SSI master and set the SSI clocking properly.
Study IMX6DQRM.pdf Chapter 60 : SSI
22.214.171.124 DIV2, PSR and PM Bit Description
I hope this help to start with your work.
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