From 17ebd5bf3393144f3ead19384318a6e5b01c4f90 Mon Sep 17 00:00:00 2001
From: Cliff Cai <cliff.cai@analog.com>
Date: Tue, 17 Nov 2009 09:36:21 +0000
Subject: [PATCH] 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>
---
drivers/spi/bfin_spi.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/bfin_spi.c b/drivers/spi/bfin_spi.c
index 2a72f99b24..093166efed 100644
--- 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();
--
2.39.5