i2c: sirf: support reverse direction of address

if users set I2C_M_REV_DIR_ADDR, revert the direction of address.
Signed-off-by: NZhiwu Song <Zhiwu.Song@csr.com>
Signed-off-by: NRongjun Ying <rongjun.ying@csr.com>
Signed-off-by: NBarry Song <Baohua.Song@csr.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

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++));
 }