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From 6d356030061c6e90437dbf4b32f95a1fa36d8868 Mon Sep 17 00:00:00 2001
From: Martin Sperl <kernel@martin.sperl.org>
Date: Wed, 22 Jul 2015 08:34:41 +0000
Subject: [PATCH 160/171] dt-overlay to enable dma for spi driver
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/spi-dma-overlay.dts | 20 ++++++++++++++++++++
2 files changed, 21 insertions(+)
create mode 100755 arch/arm/boot/dts/overlays/spi-dma-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -45,6 +45,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-sense-over
dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
+dtb-$(RPI_DT_OVERLAYS) += spi-dma-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += tinylcd35-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += uart1-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += vga666-overlay.dtb
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/spi-dma-overlay.dts
@@ -0,0 +1,20 @@
+/*
+ * Device tree overlay for spi-bcm2835 to allow dma
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
+
+ fragment@0 {
+ target = <&spi0>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ dmas = <&dma 6>, <&dma 7>;
+ dma-names = "tx", "rx";
+ };
+ };
+ };
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