serial: ns16550: Read reg-io-width from device tree

Cache the value of the reg-io-width property for the future use.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 25b9d17..9d78b1f 100644 (file)
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -446,6 +446,7 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
 
        plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
        plat->reg_shift = dev_read_u32_default(dev, "reg-shift", 0);
+       plat->reg_width = dev_read_u32_default(dev, "reg-io-width", 1);
 
        err = clk_get_by_index(dev, 0, &clk);
        if (!err) {

diff --git a/include/ns16550.h b/include/ns16550.h
index f565645..22b89e4 100644 (file)
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -49,11 +49,13 @@
  * struct ns16550_platdata - information about a NS16550 port
  *
  * @base:              Base register address
+ * @reg_width:         IO accesses size of registers (in bytes)
  * @reg_shift:         Shift size of registers (0=byte, 1=16bit, 2=32bit...)
  * @clock:             UART base clock speed in Hz
  */
 struct ns16550_platdata {
        unsigned long base;
+       int reg_width;
        int reg_shift;
        int reg_offset;
        int clock;