arch/arm/boot/dts/bcm2835.dtsi

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "bcm283x.dtsi"
   3 #include "bcm2835-common.dtsi"
   4 #include "bcm2835-rpi-common.dtsi"
   5
   6 / {
   7         compatible = "brcm,bcm2835";
   8
   9         cpus {
  10                 #address-cells = <1>;
  11                 #size-cells = <0>;
  12
  13                 cpu@0 {
  14                         device_type = "cpu";
  15                         compatible = "arm,arm1176jzf-s";
  16                         reg = <0x0>;
  17                         /* Source for d/i-cache-line-size and d/i-cache-sets
  18                          * https://developer.arm.com/documentation/ddi0301
  19                          * /h/level-one-memory-system/cache-organization?lang=en
  20                          *
  21                          * Source for d/i-cache-size
  22                          * https://forums.raspberrypi.com/viewtopic.php?t=98428
  23                          *
  24                          * NOTE: The BCM2835 has a L2 cache but it is dedicated to the GPU
  25                          * It can be shared with the CPU through fw settings,
  26                          * but this is not recommended.
  27                          */
  28                         d-cache-size = <0x4000>;
  29                         d-cache-line-size = <16>;
  30                         d-cache-sets = <256>; // 16KiB(size)/16(line-size)=1024ways/4-way set
  31                         i-cache-size = <0x4000>;
  32                         i-cache-line-size = <16>;
  33                         i-cache-sets = <256>; // 16KiB(size)/16(line-size)=1024ways/4-way set
  34                 };
  35         };
  36
  37         soc {
  38                 ranges = <0x7e000000 0x20000000 0x02000000>;
  39                 dma-ranges = <0x40000000 0x00000000 0x20000000>;
  40         };
  41
  42         arm-pmu {
  43                 compatible = "arm,arm1176-pmu";
  44         };
  45 };
  46
  47 &cpu_thermal {
  48         coefficients = <(-538)  407000>;
  49 };
  50
  51 /* enable thermal sensor with the correct compatible property set */
  52 &thermal {
  53         compatible = "brcm,bcm2835-thermal";
  54         status = "okay";
  55 };