i2c: sirf: support reverse direction of address

if users set I2C_M_REV_DIR_ADDR, revert the direction of address.

Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com>
Signed-off-by: Rongjun Ying <rongjun.ying@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-sirf.c b/drivers/i2c/busses/i2c-sirf.c
index 3b5fd3854522..30ae3780b7bf 100644
--- a/drivers/i2c/busses/i2c-sirf.c
+++ b/drivers/i2c/busses/i2c-sirf.c
@@ -194,6 +194,10 @@ static void i2c_sirfsoc_set_address(struct sirfsoc_i2c *siic,
         if (msg->flags & I2C_M_RD)
                 addr |= 1;
 
+        /* Reverse direction bit */
+        if (msg->flags & I2C_M_REV_DIR_ADDR)
+                addr ^= 1;
+
         writel(addr, siic->base + SIRFSOC_I2C_CMD(siic->cmd_ptr++));
 }