mfd: mc13xxx: Move SPI erratum workaround into SPI I/O function

Move the workaround for double sending AUDIO_CODEC and AUDIO_DAC writes
into the SPI core, aiding refactoring to eliminate the ASoC custom I/O
functions and avoiding the extra writes for I2C.

Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/mfd/mc13xxx-spi.c b/drivers/mfd/mc13xxx-spi.c
index 77189daadf1e..5f14ef6693c2 100644
--- a/drivers/mfd/mc13xxx-spi.c
+++ b/drivers/mfd/mc13xxx-spi.c
@@ -94,10 +94,15 @@ static int mc13xxx_spi_write(void *context, const void *data, size_t count)
 {
         struct device *dev = context;
         struct spi_device *spi = to_spi_device(dev);
+        const char *reg = data;
 
         if (count != 4)
                 return -ENOTSUPP;
 
+        /* include errata fix for spi audio problems */
+        if (*reg == MC13783_AUDIO_CODEC || *reg == MC13783_AUDIO_DAC)
+                spi_write(spi, data, count);
+
         return spi_write(spi, data, count);
 }