El Mon, Aug 29, 2016 at 12:28:21PM -0700, Nicolin Chen deia:

Yes, it seems that it also tried to correct the clock sources
as those were not available when adding the S/PDIF support at
the first place.

I wonder if maybe they need to be defined, assigned or somehow listed
elsewhere and they are not for wandboard quad (but are for other boards)?
 

quoted

The issue is fixed for me with this patch but I'm not sure what's the
best way to help fix any issue someone else may have or what other
info or test you might need. Any guidance welcome. 

quoted

--- linux-4.7-no-spdif-out/arch/arm/boot/dts/imx6qdl.dtsi	2016-07-25 00:19:43.000000000 +0200
+++ linux-4.7/arch/arm/boot/dts/imx6qdl.dtsi	2016-08-28 17:59:14.276774409 +0200

@@ -240,9 +240,9 @@
 					       <&sdma 15 18 0>;
 					dma-names = "rx", "tx";
 					clocks = <&clks IMX6QDL_CLK_SPDIF_GCLK>, <&clks IMX6QDL_CLK_OSC>,
-						 <&clks IMX6QDL_CLK_SPDIF>, <&clks IMX6QDL_CLK_ASRC>,
-						 <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_ESAI_EXTAL>,
-						 <&clks IMX6QDL_CLK_IPG>, <&clks IMX6QDL_CLK_MLB>,
+						 <&clks IMX6QDL_CLK_SPDIF>, <&clks IMX6QDL_CLK_DUMMY>,
+						 <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_DUMMY>,
+						 <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_DUMMY>,
 						 <&clks IMX6QDL_CLK_DUMMY>, <&clks IMX6QDL_CLK_SPBA>;
 					clock-names = "core",  "rxtx0",
 						      "rxtx1", "rxtx2",

This looks like that you merely revert the SPDIF_GCLK. 

I revert only some clocks, yes. I left SPDIF_GCLK and CLK_SBPA intact.
So it is a partial revert of the commit.

Would you
please do a little debug using "#define DEBUG 1" and check printk
from fsl_spdif_probe_txclk() to see the difference between before
and after Shengjiu's commit?

Yes, but I'm compiling the kernel in the wandboard, so it'll take me some time. 

Thank you.