1 Broadcom AVS mail box and interrupt register bindings
2 =====================================================
3
4 A total of three DT nodes are required. One node (brcm,avs-cpu-data-mem)
5 references the mailbox register used to communicate with the AVS CPU[1]. The
6 second node (brcm,avs-cpu-l2-intr) is required to trigger an interrupt on
7 the AVS CPU. The interrupt tells the AVS CPU that it needs to process a
8 command sent to it by a driver. Interrupting the AVS CPU is mandatory for
9 commands to be processed.
10
11 The interface also requires a reference to the AVS host interrupt controller,
12 so a driver can react to interrupts generated by the AVS CPU whenever a command
13 has been processed. See [2] for more information on the brcm,l2-intc node.
14
15 [1] The AVS CPU is an independent co-processor that runs proprietary
16 firmware. On some SoCs, this firmware supports DFS and DVFS in addition to
17 Adaptive Voltage Scaling.
18
19 [2] Documentation/devicetree/bindings/interrupt-controller/brcm,l2-intc.yaml
20
21
22 Node brcm,avs-cpu-data-mem
23 --------------------------
24
25 Required properties:
26 - compatible: must include: brcm,avs-cpu-data-mem and
27 should include: one of brcm,bcm7271-avs-cpu-data-mem or
28 brcm,bcm7268-avs-cpu-data-mem
29 - reg: Specifies base physical address and size of the registers.
30 - interrupts: The interrupt that the AVS CPU will use to interrupt the host
31 when a command completed.
32 - interrupt-names: The name of the interrupt used to interrupt the host.
33
34 Optional properties:
35 - None
36
37 Node brcm,avs-cpu-l2-intr
38 -------------------------
39
40 Required properties:
41 - compatible: must include: brcm,avs-cpu-l2-intr and
42 should include: one of brcm,bcm7271-avs-cpu-l2-intr or
43 brcm,bcm7268-avs-cpu-l2-intr
44 - reg: Specifies base physical address and size of the registers.
45
46 Optional properties:
47 - None
48
49
50 Example
51 =======
52
53 avs_host_l2_intc: interrupt-controller@f04d1200 {
54 #interrupt-cells = <1>;
55 compatible = "brcm,l2-intc";
56 interrupt-parent = <&intc>;
57 reg = <0xf04d1200 0x48>;
58 interrupt-controller;
59 interrupts = <0x0 0x19 0x0>;
60 interrupt-names = "avs";
61 };
62
63 avs-cpu-data-mem@f04c4000 {
64 compatible = "brcm,bcm7271-avs-cpu-data-mem",
65 "brcm,avs-cpu-data-mem";
66 reg = <0xf04c4000 0x60>;
67 interrupts = <0x1a>;
68 interrupt-parent = <&avs_host_l2_intc>;
69 interrupt-names = "sw_intr";
70 };
71
72 avs-cpu-l2-intr@f04d1100 {
73 compatible = "brcm,bcm7271-avs-cpu-l2-intr",
74 "brcm,avs-cpu-l2-intr";
75 reg = <0xf04d1100 0x10>;
76 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.