ns16550: change reg-shift property default to zero

Change reg-shift property default to zero. When the integer property
is missing, it should be taken as zero. This is consistent to Linux
drivers/tty/serial/of_serial.c.

The x86 and most powerpc use reg-shift of 0. Most others use reg-shift
of 2. While reg-shift of 1 is rarely used.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 166deabcd436bd634ec09a46d4b280903b01c005..23243ee84e89d664a054708eaca9bd5031f028ed 100644 (file)
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -403,7 +403,7 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
 
        plat->base = addr;
        plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
-                                        "reg-shift", 1);
+                                        "reg-shift", 0);
        plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
                                     "clock-frequency",
                                     CONFIG_SYS_NS16550_CLK);