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

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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>
This commit is contained in:
Andy Shevchenko 2018-11-20 23:52:35 +02:00 committed by Simon Glass
parent 0af761620f
commit 4e7207791c
2 changed files with 3 additions and 0 deletions
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1
drivers/serial/ns16550.c
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@ -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) {

2
include/ns16550.h
View File

@ -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;