dt: cpufreq: brcm: New binding document for brcmstb-avs-cpufreq

Broadcom AVS mail box and interrupt register bindings

=====================================================

A total of three DT nodes are required. One node (brcm,avs-cpu-data-mem)

references the mailbox register used to communicate with the AVS CPU[1]. The

second node (brcm,avs-cpu-l2-intr) is required to trigger an interrupt on

the AVS CPU. The interrupt tells the AVS CPU that it needs to process a

command sent to it by a driver. Interrupting the AVS CPU is mandatory for

commands to be processed.

The interface also requires a reference to the AVS host interrupt controller,

so a driver can react to interrupts generated by the AVS CPU whenever a command

has been processed. See [2] for more information on the brcm,l2-intc node.

[1] The AVS CPU is an independent co-processor that runs proprietary

firmware. On some SoCs, this firmware supports DFS and DVFS in addition to

Adaptive Voltage Scaling.

[2] Documentation/devicetree/bindings/interrupt-controller/brcm,l2-intc.txt

Node brcm,avs-cpu-data-mem

--------------------------

Required properties:

- compatible: must include: brcm,avs-cpu-data-mem and

              should include: one of brcm,bcm7271-avs-cpu-data-mem or

                              brcm,bcm7268-avs-cpu-data-mem

- reg: Specifies base physical address and size of the registers.

- interrupts: The interrupt that the AVS CPU will use to interrupt the host

              when a command completed.

- interrupt-parent: The interrupt controller the above interrupt is routed

                    through.

- interrupt-names: The name of the interrupt used to interrupt the host.

Optional properties:

- None

Node brcm,avs-cpu-l2-intr

-------------------------

Required properties:

- compatible: must include: brcm,avs-cpu-l2-intr and

              should include: one of brcm,bcm7271-avs-cpu-l2-intr or

                              brcm,bcm7268-avs-cpu-l2-intr

- reg: Specifies base physical address and size of the registers.

Optional properties:

- None

Example

=======

	avs_host_l2_intc: interrupt-controller@f04d1200 {

		#interrupt-cells = <1>;

		compatible = "brcm,l2-intc";

		interrupt-parent = <&intc>;

		reg = <0xf04d1200 0x48>;

		interrupt-controller;

		interrupts = <0x0 0x19 0x0>;

		interrupt-names = "avs";

	};

	avs-cpu-data-mem@f04c4000 {

		compatible = "brcm,bcm7271-avs-cpu-data-mem",

				"brcm,avs-cpu-data-mem";

		reg = <0xf04c4000 0x60>;

		interrupts = <0x1a>;

		interrupt-parent = <&avs_host_l2_intc>;

		interrupt-names = "sw_intr";

	};

	avs-cpu-l2-intr@f04d1100 {

		compatible = "brcm,bcm7271-avs-cpu-l2-intr",

				"brcm,avs-cpu-l2-intr";

		reg = <0xf04d1100 0x10>;

	};

S:	Maintained

F:	drivers/mtd/nand/brcmnand/

BROADCOM STB AVS CPUFREQ DRIVER

M:	Markus Mayer <mmayer@broadcom.com>

M:	bcm-kernel-feedback-list@broadcom.com

L:	linux-pm@vger.kernel.org

S:	Maintained

F:	Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt

BROADCOM SPECIFIC AMBA DRIVER (BCMA)

M:	Rafał Miłecki <zajec5@gmail.com>

L:	linux-wireless@vger.kernel.org