[PATCH 3/3][POWERPC][V2] Xilinx: boot support for Xilinx uart 16550.

[John Linn]

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 <john.linn at xilinx.com>
---
 arch/powerpc/boot/ns16550.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/boot/ns16550.c b/arch/powerpc/boot/ns16550.c
index f8f1b2f..da9d2c2 100644
--- a/arch/powerpc/boot/ns16550.c
+++ b/arch/powerpc/boot/ns16550.c
@@ -56,6 +56,7 @@ int ns16550_console_init(void *devp, struct serial_console_data *scdp)
 {
 	int n;
 	unsigned long reg_phys;
+	u32 reg_offset;
 
 	n = getprop(devp, "virtual-reg", &reg_base, sizeof(reg_base));
 	if (n != sizeof(reg_base)) {
@@ -65,6 +66,10 @@ int ns16550_console_init(void *devp, struct serial_console_data *scdp)
 		reg_base = (void *)reg_phys;
 	}
 
+	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))
 		reg_shift = 0;
-- 
1.5.2.1