asoc/multi-component: fsl: add support for disabled SSI nodes

Add support for adding "status = disabled" to an SSI node to incidate that it
is not wired on the board.  This replaces the not-so-intuitive previous method
of omitting a codec-handle property.

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

2 files changed, 11 insertions, 3 deletions

diff --git a/arch/powerpc/boot/dts/mpc8610_hpcd.dts b/arch/powerpc/boot/dts/mpc8610_hpcd.dts
index 9535ce68caae..83c3218cb4da 100644
--- a/arch/powerpc/boot/dts/mpc8610_hpcd.dts
+++ b/arch/powerpc/boot/dts/mpc8610_hpcd.dts
@@ -286,6 +286,7 @@
 
                 ssi@16100 {
                         compatible = "fsl,mpc8610-ssi";
+                        status = "disabled";
                         cell-index = <1>;
                         reg = <0x16100 0x100>;
                         interrupt-parent = <&mpic>;
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 00e3e625b52a..7939c337ed9d 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -625,12 +625,19 @@ static int __devinit fsl_ssi_probe(struct of_device *of_dev,
         struct resource res;
         char name[64];
 
-        /* We are only interested in SSIs with a codec phandle in them, so let's
-         * make sure this SSI has one.
+        /* SSIs that are not connected on the board should have a
+         *      status = "disabled"
+         * property in their device tree nodes.
          */
-        if (!of_get_property(np, "codec-handle", NULL))
+        if (!of_device_is_available(np))
                 return -ENODEV;
 
+        /* Check for a codec-handle property. */
+        if (!of_get_property(np, "codec-handle", NULL)) {
+                dev_err(&of_dev->dev, "missing codec-handle property\n");
+                return -ENODEV;
+        }
+
         /* We only support the SSI in "I2S Slave" mode */
         sprop = of_get_property(np, "fsl,mode", NULL);
         if (!sprop || strcmp(sprop, "i2s-slave")) {