linux-kernel - [PATCH] ARM: dts: at91: Enable DMA on sama5d4

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Message-Id: <20170119004658.32750-1-alexandre.belloni@free-electrons.com>
Date:   Thu, 19 Jan 2017 01:46:58 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Nicolas Ferre <nicolas.ferre@...el.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        "stable #v4 . 1+" <stable@...r.kernel.org>
Subject: [PATCH] ARM: dts: at91: Enable DMA on sama5d4_xplained console

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.

Cc: stable <stable@...r.kernel.org> #v4.1+
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 arch/arm/boot/dts/at91-sama5d4_xplained.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/at91-sama5d4_xplained.dts b/arch/arm/boot/dts/at91-sama5d4_xplained.dts
index ed7fce297738..44d1171c7fc0 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@...0c000 {
+				atmel,use-dma-rx;
+				atmel,use-dma-tx;
 				status = "okay";
 			};
 
-- 
2.11.0