ASoC: p1022ds: add support for fsl,P1022 and fsl,P1022DS model names

Commit ab827d97 ("powerpc/85xx: Rework P1022DS device tree") renamed the
the /model property of the P1022DS device tree from "fsl,P1022" to
"fsl,P1022DS".  To support both old and new device trees, the ASoC
machine driver for the P1022DS needs to query the /model property and
update the platform driver object dynamically.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/fsl/p1022_ds.c

@@ -540,12 +540,6 @@ static struct platform_driver p1022_ds_driver = {
 	.probe = p1022_ds_probe,
 	.remove = __devexit_p(p1022_ds_remove),
 	.driver = {
-		/* The name must match the 'model' property in the device tree,
-		 * in lowercase letters, but only the part after that last
-		 * comma.  This is because some model properties have a "fsl,"
-		 * prefix.
-		 */
-		.name = "snd-soc-p1022",
 		.owner = THIS_MODULE,
 	},
 };
@@ -559,13 +553,39 @@ static int __init p1022_ds_init(void)
 {
 	struct device_node *guts_np;
 	struct resource res;
+	const char *sprop;
 
-	pr_info("Freescale P1022 DS ALSA SoC machine driver\n");
+	/*
+	 * Check if we're actually running on a P1022DS.  Older device trees
+	 * have a model of "fsl,P1022" and newer ones use "fsl,P1022DS", so we
+	 * need to support both.  The SSI driver uses that property to link to
+	 * the machine driver, so have to match it.
+	 */
+	sprop = of_get_property(of_find_node_by_path("/"), "model", NULL);
+	if (!sprop) {
+		pr_err("snd-soc-p1022ds: missing /model node");
+		return -ENODEV;
+	}
+
+	pr_debug("snd-soc-p1022ds: board model name is %s\n", sprop);
+
+	/*
+	 * The name of this board, taken from the device tree.  Normally, this is a*
+	 * fixed string, but some P1022DS device trees have a /model property of
+	 * "fsl,P1022", and others have "fsl,P1022DS".
+	 */
+	if (strcasecmp(sprop, "fsl,p1022ds") == 0)
+		p1022_ds_driver.driver.name = "snd-soc-p1022ds";
+	else if (strcasecmp(sprop, "fsl,p1022") == 0)
+		p1022_ds_driver.driver.name = "snd-soc-p1022";
+	else
+		return -ENODEV;
 
 	/* Get the physical address of the global utilities registers */
 	guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 	if (of_address_to_resource(guts_np, 0, &res)) {
-		pr_err("p1022-ds: missing/invalid global utilities node\n");
+		pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
+		of_node_put(guts_np);
 		return -EINVAL;
 	}
 	guts_phys = res.start;