[POWERPC] Xilinx: boot support for Xilinx uart 16550.

The Xilinx 16550 uart core is not a standard 16550 because it uses
word-based addressing rather than byte-based adressing. With
additional properties it is compatible with the open firmware
'ns16550' compatible binding.

This code updates the ns16550 driver to use the reg-offset property
so that the Xilinx UART 16550 can be used with it. The reg-shift
was already being handled.

Signed-off-by: John Linn <[e-mail]>
Acked-by: Grant Likely <[e-mail]>
Signed-off-by: Josh Boyer <[e-mail]>

arch/powerpc/boot/ns16550.c

···
 int ns16550_console_init(void *devp, struct serial_console_data *scdp)
 {
 	int n;
+	u32 reg_offset;
 
 	if (dt_get_virtual_reg(devp, (void **)&reg_base, 1) < 1)
 		return -1;
+
+	n = getprop(devp, "reg-offset", &reg_offset, sizeof(reg_offset));
+	if (n == sizeof(reg_offset))
+		reg_base += reg_offset;
 
 	n = getprop(devp, "reg-shift", &reg_shift, sizeof(reg_shift));
 	if (n != sizeof(reg_shift))