ASoC: fsl_sai: Introduce a compatible string for MX6UL

MX6UL may need to configure the General Purpose Register 1 (GPR1), so
it is better to add a new compatible string to differentiate.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/fsl-sai.txt

@@ -7,8 +7,8 @@ codec/DSP interfaces.
 
 Required properties:
 
-  - compatible		: Compatible list, contains "fsl,vf610-sai" or
-			  "fsl,imx6sx-sai".
+  - compatible		: Compatible list, contains "fsl,vf610-sai",
+			  "fsl,imx6sx-sai" or "fsl,imx6ul-sai"
 
   - reg			: Offset and length of the register set for the device.
 

sound/soc/fsl/fsl_sai.c

@@ -797,7 +797,8 @@ static int fsl_sai_probe(struct platform_device *pdev)
 
 	sai->pdev = pdev;
 
-	if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai"))
+	if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai") ||
+	    of_device_is_compatible(pdev->dev.of_node, "fsl,imx6ul-sai"))
 		sai->sai_on_imx = true;
 
 	sai->is_lsb_first = of_property_read_bool(np, "lsb-first");
@@ -898,6 +899,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
 static const struct of_device_id fsl_sai_ids[] = {
 	{ .compatible = "fsl,vf610-sai", },
 	{ .compatible = "fsl,imx6sx-sai", },
+	{ .compatible = "fsl,imx6ul-sai", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, fsl_sai_ids);