ARC: [nsimosci] Change .dts to use generic 8250 UART

The Synopsys APB DW UART has a couple of special features that are not
in the System C model. In 3.8, the 8250_dw driver didn't really use these
features, but from 3.9 onwards, the 8250_dw driver has become incompatible
with our model.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: <stable@vger.kernel.org>   #3.10, 3.12, 3.13, 3.14
Cc: Francois Bedard <Francois.Bedard@synopsys.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/arch/arc/boot/dts/nsimosci.dts b/arch/arc/boot/dts/nsimosci.dts
index ea16d782af58..8bd238c34c7d 100644
--- a/arch/arc/boot/dts/nsimosci.dts
+++ b/arch/arc/boot/dts/nsimosci.dts
@@ -11,7 +11,7 @@
 
 / {
         compatible = "snps,nsimosci";
-        clock-frequency = <80000000>;   /* 80 MHZ */
+        clock-frequency = <20000000>;   /* 20 MHZ */
         #address-cells = <1>;
         #size-cells = <1>;
         interrupt-parent = <&intc>;
@@ -44,15 +44,14 @@
                 };
 
                 uart0: serial@c0000000 {
-                        compatible = "snps,dw-apb-uart";
+                        compatible = "ns8250";
                         reg = <0xc0000000 0x2000>;
                         interrupts = <11>;
-                        #clock-frequency = <80000000>;
                         clock-frequency = <3686400>;
                         baud = <115200>;
                         reg-shift = <2>;
                         reg-io-width = <4>;
-                        status = "okay";
+                        no-loopback-test = <1>;
                 };
 
                 pgu0: pgu@c9000000 {