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authorGregory CLEMENT <gregory.clement@free-electrons.com>2012-12-04 18:04:59 +0100
committerJason Cooper <jason@lakedaemon.net>2013-01-06 17:41:14 +0000
commitb24212fbfba25102cab7b4b1fd2919a58e02ae31 (patch)
tree397100d27e14ebd59c30d29da93f4e76b1624aa3 /arch/arm/boot/dts
parentd1c3ed669a2d452cacfb48c2d171a1f364dae2ed (diff)
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arm: mvebu: Use dw-apb-uart instead of ns16650 as UART driver
The UART controller used in the Armada 370 and Armada XP SoCs is the Synopsys DesignWare 8250 (aka Synopsys DesignWare ABP UART). The improper use of the ns16550 can lead to a kernel oops during boot if a character is sent to the UART before the initialization of the driver. The DW APB has an extra interrupt that gets raised when writing to the LCR when busy. This explains why we need to use dw-apb-uart driver to handle this. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'arch/arm/boot/dts')
-rw-r--r--arch/arm/boot/dts/armada-370-xp.dtsi6
-rw-r--r--arch/arm/boot/dts/armada-xp.dtsi6
2 files changed, 8 insertions, 4 deletions
diff --git a/arch/arm/boot/dts/armada-370-xp.dtsi b/arch/arm/boot/dts/armada-370-xp.dtsi
index cf6c48a09eac..4c0abe85405f 100644
--- a/arch/arm/boot/dts/armada-370-xp.dtsi
+++ b/arch/arm/boot/dts/armada-370-xp.dtsi
@@ -50,17 +50,19 @@
ranges;
serial@d0012000 {
- compatible = "ns16550";
+ compatible = "snps,dw-apb-uart";
reg = <0xd0012000 0x100>;
reg-shift = <2>;
interrupts = <41>;
+ reg-io-width = <4>;
status = "disabled";
};
serial@d0012100 {
- compatible = "ns16550";
+ compatible = "snps,dw-apb-uart";
reg = <0xd0012100 0x100>;
reg-shift = <2>;
interrupts = <42>;
+ reg-io-width = <4>;
status = "disabled";
};
diff --git a/arch/arm/boot/dts/armada-xp.dtsi b/arch/arm/boot/dts/armada-xp.dtsi
index 367aa3f94912..8a85ffe77f03 100644
--- a/arch/arm/boot/dts/armada-xp.dtsi
+++ b/arch/arm/boot/dts/armada-xp.dtsi
@@ -42,17 +42,19 @@
soc {
serial@d0012200 {
- compatible = "ns16550";
+ compatible = "snps,dw-apb-uart";
reg = <0xd0012200 0x100>;
reg-shift = <2>;
interrupts = <43>;
+ reg-io-width = <4>;
status = "disabled";
};
serial@d0012300 {
- compatible = "ns16550";
+ compatible = "snps,dw-apb-uart";
reg = <0xd0012300 0x100>;
reg-shift = <2>;
interrupts = <44>;
+ reg-io-width = <4>;
status = "disabled";
};