[PATCH] powerpc: legacy_serial: reg-offset & shift aren't used

[John Linn]

The legacy serial driver does not work with an 8250
type UART that uses reg-offset and reg-shift. This
change updates the driver so it doesn't find the UART
when those properties are present on the UART in the
device tree for soc devices.

Signed-off-by: John Linn <john.linn at xilinx.com>
Acked-by: Grant Likely <grant.likely at secretlab.ca>
---

 arch/powerpc/kernel/legacy_serial.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index 61dd174..b43235f 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -136,6 +136,11 @@ static int __init add_legacy_soc_port(struct device_node *np,
 	if (of_get_property(np, "clock-frequency", NULL) == NULL)
 		return -1;
 
+	/* if reg-shift and offset, don't try to use it */
+	if ((of_get_property(np, "reg-shift", NULL) != NULL) &&
+		(of_get_property(np, "reg-offset", NULL) != NULL))
+		return -1;
+
 	/* if rtas uses this device, don't try to use it as well */
 	if (of_get_property(np, "used-by-rtas", NULL) != NULL)
 		return -1;
-- 
1.5.2.1



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