arch/arm/boot/dts/bcm2835.dtsi

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "bcm283x.dtsi"
   3 #include "bcm2835-common.dtsi"
   4
   5 / {
   6         compatible = "brcm,bcm2835";
   7
   8         cpus {
   9                 #address-cells = <1>;
  10                 #size-cells = <0>;
  11
  12                 cpu@0 {
  13                         device_type = "cpu";
  14                         compatible = "arm,arm1176jzf-s";
  15                         reg = <0x0>;
  16                         /* Source for d/i-cache-line-size and d/i-cache-sets
  17                          * https://developer.arm.com/documentation/ddi0301
  18                          * /h/level-one-memory-system/cache-organization?lang=en
  19                          *
  20                          * Source for d/i-cache-size
  21                          * https://forums.raspberrypi.com/viewtopic.php?t=98428
  22                          *
  23                          * NOTE: The BCM2835 has a L2 cache but it is dedicated to the GPU
  24                          * It can be shared with the CPU through fw settings,
  25                          * but this is not recommended.
  26                          */
  27                         d-cache-size = <0x4000>;
  28                         d-cache-line-size = <16>;
  29                         d-cache-sets = <256>; // 16KiB(size)/16(line-size)=1024ways/4-way set
  30                         i-cache-size = <0x4000>;
  31                         i-cache-line-size = <16>;
  32                         i-cache-sets = <256>; // 16KiB(size)/16(line-size)=1024ways/4-way set
  33                 };
  34         };
  35
  36         soc {
  37                 ranges = <0x7e000000 0x20000000 0x02000000>;
  38                 dma-ranges = <0x40000000 0x00000000 0x20000000>;
  39         };
  40
  41         arm-pmu {
  42                 compatible = "arm,arm1176-pmu";
  43         };
  44 };
  45
  46 &cpu_thermal {
  47         coefficients = <(-538)  407000>;
  48 };
  49
  50 /* enable thermal sensor with the correct compatible property set */
  51 &thermal {
  52         compatible = "brcm,bcm2835-thermal";
  53         status = "okay";
  54 };