spi/dw_spi: enable platform specific chipselect.

The driver core allows for a platform-specific chipselect assert/deassert
function, however the chipselect function in the core doesn't take advantage
of this fact.

This enables the use of a custom function, should it be defined.

Signed-off-by: George Shore <george@georgeshore.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/spi/dw_spi.h b/include/linux/spi/dw_spi.h
index 1a127a31e017..cc813f95a2f2 100644
--- a/include/linux/spi/dw_spi.h
+++ b/include/linux/spi/dw_spi.h
@@ -172,6 +172,10 @@ static inline void spi_chip_sel(struct dw_spi *dws, u16 cs)
 {
         if (cs > dws->num_cs)
                 return;
+
+        if (dws->cs_control)
+                dws->cs_control(1);
+
         dw_writel(dws, ser, 1 << cs);
 }