Kernel-4.18.0-80.el8_brcm,bcm2835-mbox

Broadcom BCM2835 VideoCore mailbox IPC

Required properties:

• compatible: Should be “brcm,bcm2835-mbox”
• reg: Specifies base physical address and size of the registers
• interrupts: The interrupt number

      See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
  

• #mbox-cells: Specifies the number of cells needed to encode a mailbox

      channel. The value shall be 0, since there is only one
      mailbox channel implemented by the device.
  

Example:

mailbox: mailbox@7e00b880 {
compatible = “brcm,bcm2835-mbox”;
reg = <0x7e00b880 0x40>;
interrupts = <0 1>;
#mbox-cells = <0>;
};

firmware: firmware {
compatible = “raspberrypi,firmware”;
mboxes = <&mailbox>;
#power-domain-cells = <1>;
};