ASoC: fsl_sai: add of_match data

New revisions of the SAI IP block have even more differences that need
be taken into account by the driver. To avoid sprinking compatible
checks all over the driver move the current differences into of_match_data.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Angus Ainslie <angus@akkea.ca>
Reviewed-by: Angus Ainslie <angus@akkea.ca>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20190717105635.18514-2-l.stach@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_sai.c

@@ -9,6 +9,7 @@
 #include <linux/dmaengine.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -788,10 +789,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	sai->pdev = pdev;
-
-	if (of_device_is_compatible(np, "fsl,imx6sx-sai") ||
-	    of_device_is_compatible(np, "fsl,imx6ul-sai"))
-		sai->sai_on_imx = true;
+	sai->soc_data = of_device_get_match_data(&pdev->dev);
 
 	sai->is_lsb_first = of_property_read_bool(np, "lsb-first");
 
@@ -900,7 +898,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	if (sai->sai_on_imx)
+	if (sai->soc_data->use_imx_pcm)
 		return imx_pcm_dma_init(pdev, IMX_SAI_DMABUF_SIZE);
 	else
 		return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
@@ -913,10 +911,18 @@ static int fsl_sai_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct fsl_sai_soc_data fsl_sai_vf610_data = {
+	.use_imx_pcm = false,
+};
+
+static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = {
+	.use_imx_pcm = true,
+};
+
 static const struct of_device_id fsl_sai_ids[] = {
-	{ .compatible = "fsl,vf610-sai", },
-	{ .compatible = "fsl,imx6sx-sai", },
-	{ .compatible = "fsl,imx6ul-sai", },
+	{ .compatible = "fsl,vf610-sai", .data = &fsl_sai_vf610_data },
+	{ .compatible = "fsl,imx6sx-sai", .data = &fsl_sai_imx6sx_data },
+	{ .compatible = "fsl,imx6ul-sai", .data = &fsl_sai_imx6sx_data },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, fsl_sai_ids);

sound/soc/fsl/fsl_sai.h

@@ -126,6 +126,10 @@
 #define FSL_SAI_MAXBURST_TX 6
 #define FSL_SAI_MAXBURST_RX 6
 
+struct fsl_sai_soc_data {
+	bool use_imx_pcm;
+};
+
 struct fsl_sai {
 	struct platform_device *pdev;
 	struct regmap *regmap;
@@ -135,7 +139,6 @@ struct fsl_sai {
 	bool is_slave_mode;
 	bool is_lsb_first;
 	bool is_dsp_mode;
-	bool sai_on_imx;
 	bool synchronous[2];
 
 	unsigned int mclk_id[2];
@@ -143,6 +146,7 @@ struct fsl_sai {
 	unsigned int slots;
 	unsigned int slot_width;
 
+	const struct fsl_sai_soc_data *soc_data;
 	struct snd_dmaengine_dai_dma_data dma_params_rx;
 	struct snd_dmaengine_dai_dma_data dma_params_tx;
 };