From: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Date: Thu, 19 Jan 2017 00:46:58 +0000 (+0100)
Subject: ARM: dts: at91: Enable DMA on sama5d4_xplained console
X-Git-Tag: firefly_0821_release~176^2^2^2~150
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=be83ed085fcd8808747bd6d2f416a5ecee0aa7e5;p=firefly-linux-kernel-4.4.55.git

ARM: dts: at91: Enable DMA on sama5d4_xplained console

commit ef8d02d4a2c36f7a93e74c95a9c419353b310117 upstream.

Enable DMA on usart3 to get a more reliable console. This is especially
useful for automation and kernelci were a kernel with PROVE_LOCKING enabled
is quite susceptible to character loss, resulting in tests failure.

Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/arm/boot/dts/at91-sama5d4_xplained.dts b/arch/arm/boot/dts/at91-sama5d4_xplained.dts
index da84e65b56ef..e27024cdf48b 100644
--- a/arch/arm/boot/dts/at91-sama5d4_xplained.dts
+++ b/arch/arm/boot/dts/at91-sama5d4_xplained.dts
@@ -110,6 +110,8 @@
 			};
 
 			usart3: serial@fc00c000 {
+				atmel,use-dma-rx;
+				atmel,use-dma-tx;
 				status = "okay";
 			};