arm: mvebu: Reduce reg-io-width with UARTs

Setting the reg-io-width to 1 byte represents more accurate
description of the HW.

This will fix an issue where UART driver causes kernel
panic during bootup. Gregory CLEMENT traced the issue to
autoconfig() in 8250.c, where the existence of FIFO is
checked from UART_IIR register. The register is now read as
32-bit value as the reg-io-width is set to 4-bytes. The
retuned value seems to contain bogus data for bits 31:8,
causing the issue.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/arch/arm/boot/dts/armada-370-xp.dtsi b/arch/arm/boot/dts/armada-370-xp.dtsi
index 6f1acc75e1559ca109066c7ad68c6e11f50087a0..99afca46e33d1417b5bc3697cb5192009821c0bb 100644 (file)
--- a/arch/arm/boot/dts/armada-370-xp.dtsi
+++ b/arch/arm/boot/dts/armada-370-xp.dtsi
@@ -54,7 +54,7 @@
                                reg = <0xd0012000 0x100>;
                                reg-shift = <2>;
                                interrupts = <41>;
-                               reg-io-width = <4>;
+                               reg-io-width = <1>;
                                status = "disabled";
                };
                serial@d0012100 {
@@ -62,7 +62,7 @@
                                reg = <0xd0012100 0x100>;
                                reg-shift = <2>;
                                interrupts = <42>;
-                               reg-io-width = <4>;
+                               reg-io-width = <1>;
                                status = "disabled";
                };
 

diff --git a/arch/arm/boot/dts/armada-xp.dtsi b/arch/arm/boot/dts/armada-xp.dtsi
index 1443949c165ea8fa787fe798f687a63a116f2626..ca00d8326c8746cd127e7c35f3c8e7d3da697c15 100644 (file)
--- a/arch/arm/boot/dts/armada-xp.dtsi
+++ b/arch/arm/boot/dts/armada-xp.dtsi
@@ -46,7 +46,7 @@
                                reg = <0xd0012200 0x100>;
                                reg-shift = <2>;
                                interrupts = <43>;
-                               reg-io-width = <4>;
+                               reg-io-width = <1>;
                                status = "disabled";
                };
                serial@d0012300 {
@@ -54,7 +54,7 @@
                                reg = <0xd0012300 0x100>;
                                reg-shift = <2>;
                                interrupts = <44>;
-                               reg-io-width = <4>;
+                               reg-io-width = <1>;
                                status = "disabled";
                };