Alias was missing for SoC of the at91sam9x5 familly that embed USART3.
Preripheral node and pinctrl declarations are already in the
at91sam9x5_usart3.dtsi file.

Reported-by: Jiri Prchal <jiri.prc...@aksignal.cz>
Signed-off-by: Nicolas Ferre <nicolas.fe...@atmel.com>
---
 arch/arm/boot/dts/at91sam9g25.dtsi | 4 ++++
 arch/arm/boot/dts/at91sam9x25.dtsi | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/at91sam9g25.dtsi 
b/arch/arm/boot/dts/at91sam9g25.dtsi
index 17b879990914..d4650b4e9ebb 100644
--- a/arch/arm/boot/dts/at91sam9g25.dtsi
+++ b/arch/arm/boot/dts/at91sam9g25.dtsi
@@ -14,6 +14,10 @@
        model = "Atmel AT91SAM9G25 SoC";
        compatible = "atmel,at91sam9g25", "atmel,at91sam9x5";
 
+       aliases {
+               serial4 = &usart3;
+       };
+
        ahb {
                apb {
                        pinctrl@fffff400 {
diff --git a/arch/arm/boot/dts/at91sam9x25.dtsi 
b/arch/arm/boot/dts/at91sam9x25.dtsi
index c2554219f7a4..aceee86f60eb 100644
--- a/arch/arm/boot/dts/at91sam9x25.dtsi
+++ b/arch/arm/boot/dts/at91sam9x25.dtsi
@@ -15,6 +15,10 @@
        model = "Atmel AT91SAM9X25 SoC";
        compatible = "atmel,at91sam9x25", "atmel,at91sam9x5";
 
+       aliases {
+               serial4 = &usart3;
+       };
+
        ahb {
                apb {
                        pinctrl@fffff400 {
-- 
1.8.2.2

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