Blackfin: bfin_spi: let boards control idle value

Some SPI devices like to see high idle values rather than low.

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/drivers/spi/bfin_spi.c b/drivers/spi/bfin_spi.c
index 2a72f99..093166e 100644 (file)
--- a/drivers/spi/bfin_spi.c
+++ b/drivers/spi/bfin_spi.c
@@ -314,6 +314,10 @@ void spi_release_bus(struct spi_slave *slave)
        SSYNC();
 }
 
+#ifndef CONFIG_BFIN_SPI_IDLE_VAL
+# define CONFIG_BFIN_SPI_IDLE_VAL 0xff
+#endif
+
 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
                void *din, unsigned long flags)
 {
@@ -340,7 +344,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
 
        /* todo: take advantage of hardware fifos and setup RX dma */
        while (bytes--) {
-               u8 value = (tx ? *tx++ : 0);
+               u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL);
                debug("%s: tx:%x ", __func__, value);
                write_SPI_TDBR(bss, value);
                SSYNC();