[PATCHv4 4/9] ASoC: fsl-asoc-card: add new compatible for a generic codec use case

[Elinor Montmasson <elinor.montmasson@xxxxxxxxxxxxxxxxxxxx>]

Add the new compatible "fsl,imx-audio-generic" for a generic codec
use case. It allows using the fsl-asoc-card driver with the
spdif_receiver and spdif_transmitter codec drivers used as dummy codecs.
It can be used for cases where there is no real codec or codecs which do
not require declaring controls.

Signed-off-by: Elinor Montmasson <elinor.montmasson@xxxxxxxxxxxxxxxxxxxx>
Co-authored-by: Philip-Dylan Gleonec <philip-dylan.gleonec@xxxxxxxxxxxxxxxxxxxx>
---
 sound/soc/fsl/fsl-asoc-card.c | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c
index 620a25eb068a..a4ecc9093558 100644
--- a/sound/soc/fsl/fsl-asoc-card.c
+++ b/sound/soc/fsl/fsl-asoc-card.c
@@ -567,6 +567,7 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 	struct platform_device *cpu_pdev;
 	struct fsl_asoc_card_priv *priv;
 	struct device *codec_dev[2] = { NULL, NULL };
+	const char *generic_codec_dai_names[2];
 	const char *codec_dai_name;
 	const char *codec_dev_name[2];
 	u32 asrc_fmt = 0;
@@ -744,6 +745,11 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 		priv->codec_priv[0].fll_id = WM8904_CLK_FLL;
 		priv->codec_priv[0].pll_id = WM8904_FLL_MCLK;
 		priv->dai_fmt |= SND_SOC_DAIFMT_CBP_CFP;
+	} else if (of_device_is_compatible(np, "fsl,imx-audio-generic")) {
+		generic_codec_dai_names[0] = "dit-hifi";
+		generic_codec_dai_names[1] = "dir-hifi";
+		priv->dai_link[0].num_codecs = 2;
+		priv->dai_link[2].num_codecs = 2;
 	} else {
 		dev_err(&pdev->dev, "unknown Device Tree compatible\n");
 		ret = -EINVAL;
@@ -798,6 +804,12 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 		ret = -EPROBE_DEFER;
 		goto asrc_fail;
 	}
+	if (of_device_is_compatible(np, "fsl,imx-audio-generic")
+	  && !codec_dev[1]) {
+		dev_dbg(&pdev->dev, "failed to find second codec device\n");
+		ret = -EPROBE_DEFER;
+		goto asrc_fail;
+	}
 
 	/* Common settings for corresponding Freescale CPU DAI driver */
 	if (of_node_name_eq(cpu_np, "ssi")) {
@@ -855,11 +867,21 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 
 	/* Normal DAI Link */
 	priv->dai_link[0].cpus->of_node = cpu_np;
-	priv->dai_link[0].codecs[0].dai_name = codec_dai_name;
 
-	if (!fsl_asoc_card_is_ac97(priv))
+	if (of_device_is_compatible(np, "fsl,imx-audio-generic")) {
+		priv->dai_link[0].codecs[0].dai_name =
+			generic_codec_dai_names[0];
+		priv->dai_link[0].codecs[1].dai_name =
+			generic_codec_dai_names[1];
+	} else {
+		priv->dai_link[0].codecs[0].dai_name = codec_dai_name;
+	}
+
+	if (!fsl_asoc_card_is_ac97(priv)) {
 		priv->dai_link[0].codecs[0].of_node = codec_np[0];
-	else {
+		if (of_device_is_compatible(np, "fsl,imx-audio-generic"))
+			priv->dai_link[0].codecs[1].of_node = codec_np[1];
+	} else {
 		u32 idx;
 
 		ret = of_property_read_u32(cpu_np, "cell-index", &idx);
@@ -990,6 +1012,7 @@ static const struct of_device_id fsl_asoc_card_dt_ids[] = {
 	{ .compatible = "fsl,imx-audio-wm8958", },
 	{ .compatible = "fsl,imx-audio-nau8822", },
 	{ .compatible = "fsl,imx-audio-wm8904", },
+	{ .compatible = "fsl,imx-audio-generic", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, fsl_asoc_card_dt_ids);
-- 
2.34.1