ASoC: add support for SSI asynchronous mode to the Freescale SSI drivers

Add a new device tree property for the SSI node: "fsl,ssi-asynchronous".  If
defined, the SSI is programmed into asynchronous mode, otherwise it is
programmed into synchronous mode.  In asynchronous mode, pin SRCK must be
connected to the same clock source as STFS, and pin SRFS must be connected to
the same signal as STFS.  Asynchronous mode allows playback and capture to
use different sample sizes.  It also technically allows different sample rates,
but the driver does not support that.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/sound/soc/fsl/mpc8610_hpcd.c b/sound/soc/fsl/mpc8610_hpcd.c
index acf39a646b2f..ef67d1cdffe7 100644
--- a/sound/soc/fsl/mpc8610_hpcd.c
+++ b/sound/soc/fsl/mpc8610_hpcd.c
@@ -353,6 +353,11 @@ static int mpc8610_hpcd_probe(struct of_device *ofdev,
         }
         ssi_info.irq = machine_data->ssi_irq;
 
+        /* Do we want to use asynchronous mode? */
+        ssi_info.asynchronous =
+                of_find_property(np, "fsl,ssi-asynchronous", NULL) ? 1 : 0;
+        if (ssi_info.asynchronous)
+                dev_info(&ofdev->dev, "using asynchronous mode\n");
 
         /* Map the global utilities registers. */
         guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");