arch/arm/boot/dts/overlays/pcie-32bit-dma-overlay.dts

   1 /*
   2  * pcie-32bit-dma-overlay.dts
   3  */
   4
   5 /dts-v1/;
   6 /plugin/;
   7
   8 / {
   9         compatible = "brcm,bcm2711";
  10
  11         fragment@0 {
  12                 target-path = "/aliases";
  13                 __overlay__ {
  14                         /*
  15                          * Removing this alias stops the firmware patching the
  16                          * PCIE DT dma-ranges based on the detected chip
  17                          * revision.
  18                          */
  19                         pcie0 = "";
  20                 };
  21         };
  22
  23         fragment@1 {
  24                 target = <&pcie0>;
  25                 __overlay__ {
  26                         /*
  27                          * The size of the range is rounded up to a power of 2,
  28                          * so the range ends up being 0-4GB, and the MSI vector
  29                          * gets pushed beyond 4GB.
  30                          */
  31                         #address-cells = <3>;
  32                         #size-cells = <2>;
  33                         dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000
  34                                       0x0 0x80000000>;
  35                 };
  36         };
  37
  38 };