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>

1 files changed, 28 insertions, 8 deletions

diff --git a/sound/soc/fsl/p1022_ds.c b/sound/soc/fsl/p1022_ds.c
index 2c064a9824ad..309162652287 100644
--- a/sound/soc/fsl/p1022_ds.c
+++ b/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;
+
+        /*
+         * 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);
 
-        pr_info("Freescale P1022 DS ALSA SoC machine driver\n");
+        /*
+         * 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;