target/linux/brcm2708/patches-4.1/0159-dt-overlay-to-enable-dma-for-spi-driver.patch

   1 From bcbfa93c85c8d272a765b1db0ba3e35b917e5afd Mon Sep 17 00:00:00 2001
   2 From: Martin Sperl <kernel@martin.sperl.org>
   3 Date: Wed, 22 Jul 2015 08:34:41 +0000
   4 Subject: [PATCH 159/222] dt-overlay to enable dma for spi driver
   5
   6 Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
   7 ---
   8  arch/arm/boot/dts/overlays/Makefile            |  1 +
   9  arch/arm/boot/dts/overlays/spi-dma-overlay.dts | 20 ++++++++++++++++++++
  10  2 files changed, 21 insertions(+)
  11  create mode 100755 arch/arm/boot/dts/overlays/spi-dma-overlay.dts
  12
  13 --- a/arch/arm/boot/dts/overlays/Makefile
  14 +++ b/arch/arm/boot/dts/overlays/Makefile
  15 @@ -45,6 +45,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-sense-over
  16  dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb
  17  dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
  18  dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
  19 +dtb-$(RPI_DT_OVERLAYS) += spi-dma-overlay.dtb
  20  dtb-$(RPI_DT_OVERLAYS) += tinylcd35-overlay.dtb
  21  dtb-$(RPI_DT_OVERLAYS) += uart1-overlay.dtb
  22  dtb-$(RPI_DT_OVERLAYS) += vga666-overlay.dtb
  23 --- /dev/null
  24 +++ b/arch/arm/boot/dts/overlays/spi-dma-overlay.dts
  25 @@ -0,0 +1,20 @@
  26 +/*
  27 + * Device tree overlay for spi-bcm2835 to allow dma
  28 + */
  29 +
  30 +/dts-v1/;
  31 +/plugin/;
  32 +
  33 +/ {
  34 +       compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
  35 +
  36 +       fragment@0 {
  37 +               target = <&spi0>;
  38 +               __overlay__ {
  39 +                       #address-cells = <1>;
  40 +                       #size-cells = <0>;
  41 +                       dmas = <&dma 6>, <&dma 7>;
  42 +                       dma-names = "tx", "rx";
  43 +               };
  44 +       };
  45 + };