linux-kernel - [PATCH 4.9 022/153] ARM: dts: at91: Enable DMA on sama5d4

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Date:   Fri, 10 Mar 2017 10:07:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nicolas Ferre <nicolas.ferre@...el.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH 4.9 022/153] ARM: dts: at91: Enable DMA on sama5d4_xplained console

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

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@...el.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/boot/dts/at91-sama5d4_xplained.dts |    2 ++
 1 file changed, 2 insertions(+)

--- 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";
 			};