xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/arm/marvell/ap80x-system-controller.txt

Marvell Armada AP80x System Controller
======================================

The AP806/AP807 is one of the two core HW blocks of the Marvell Armada
7K/8K/931x SoCs. It contains system controllers, which provide several
registers giving access to numerous features: clocks, pin-muxing and
many other SoC configuration items. This DT binding allows to describe
these system controllers.

For the top level node:
 - compatible: must be: "syscon", "simple-mfd";
 - reg: register area of the AP80x system controller

SYSTEM CONTROLLER 0
===================

Clocks:
-------


The Device Tree node representing the AP806/AP807 system controller
provides a number of clocks:

 - 0: reference clock of CPU cluster 0
 - 1: reference clock of CPU cluster 1
 - 2: fixed PLL at 1200 Mhz
 - 3: MSS clock, derived from the fixed PLL

Required properties:

 - compatible: must be one of:
   * "marvell,ap806-clock"
   * "marvell,ap807-clock"
 - #clock-cells: must be set to 1

Pinctrl:
--------

For common binding part and usage, refer to
Documentation/devicetree/bindings/pinctrl/marvell,mvebu-pinctrl.txt.

Required properties:
- compatible must be "marvell,ap806-pinctrl",

Available mpp pins/groups and functions:
Note: brackets (x) are not part of the mpp name for marvell,function and given
only for more detailed description in this document.

name	pins	functions
================================================================================
mpp0	0	gpio, sdio(clk), spi0(clk)
mpp1	1	gpio, sdio(cmd), spi0(miso)
mpp2	2	gpio, sdio(d0), spi0(mosi)
mpp3	3	gpio, sdio(d1), spi0(cs0n)
mpp4	4	gpio, sdio(d2), i2c0(sda)
mpp5	5	gpio, sdio(d3), i2c0(sdk)
mpp6	6	gpio, sdio(ds)
mpp7	7	gpio, sdio(d4), uart1(rxd)
mpp8	8	gpio, sdio(d5), uart1(txd)
mpp9	9	gpio, sdio(d6), spi0(cs1n)
mpp10	10	gpio, sdio(d7)
mpp11	11	gpio, uart0(txd)
mpp12	12	gpio, sdio(pw_off), sdio(hw_rst)
mpp13	13	gpio
mpp14	14	gpio
mpp15	15	gpio
mpp16	16	gpio
mpp17	17	gpio
mpp18	18	gpio
mpp19	19	gpio, uart0(rxd), sdio(pw_off)

GPIO:
-----
For common binding part and usage, refer to
Documentation/devicetree/bindings/gpio/gpio-mvebu.txt.

Required properties:

- compatible: "marvell,armada-8k-gpio"

- offset: offset address inside the syscon block

Example:
ap_syscon: system-controller@6f4000 {
	compatible = "syscon", "simple-mfd";
	reg = <0x6f4000 0x1000>;

	ap_clk: clock {
		compatible = "marvell,ap806-clock";
		#clock-cells = <1>;
	};

	ap_pinctrl: pinctrl {
		compatible = "marvell,ap806-pinctrl";
	};

	ap_gpio: gpio {
		compatible = "marvell,armada-8k-gpio";
		offset = <0x1040>;
		ngpios = <19>;
		gpio-controller;
		#gpio-cells = <2>;
		gpio-ranges = <&ap_pinctrl 0 0 19>;
	};
};

SYSTEM CONTROLLER 1
===================

Thermal:
--------

For common binding part and usage, refer to
Documentation/devicetree/bindings/thermal/thermal*.yaml

The thermal IP can probe the temperature all around the processor. It
may feature several channels, each of them wired to one sensor.

It is possible to setup an overheat interrupt by giving at least one
critical point to any subnode of the thermal-zone node.

Required properties:
- compatible: must be one of:
  * marvell,armada-ap806-thermal
- reg: register range associated with the thermal functions.

Optional properties:
- interrupts: overheat interrupt handle. Should point to line 18 of the
  SEI irqchip. See interrupt-controller/interrupts.txt
- #thermal-sensor-cells: shall be <1> when thermal-zones subnodes refer
  to this IP and represents the channel ID. There is one sensor per
  channel. O refers to the thermal IP internal channel, while positive
  IDs refer to each CPU.

Example:
ap_syscon1: system-controller@6f8000 {
	compatible = "syscon", "simple-mfd";
	reg = <0x6f8000 0x1000>;

	ap_thermal: thermal-sensor@80 {
		compatible = "marvell,armada-ap806-thermal";
		reg = <0x80 0x10>;
		interrupt-parent = <&sei>;
		interrupts = <18>;
		#thermal-sensor-cells = <1>;
	};
};

Cluster clocks:
---------------

Device Tree Clock bindings for cluster clock of Marvell
AP806/AP807. Each cluster contain up to 2 CPUs running at the same
frequency.

Required properties:
 - compatible: must be one of:
   * "marvell,ap806-cpu-clock"
   * "marvell,ap807-cpu-clock"
- #clock-cells : should be set to 1.

- clocks : shall be the input parent clock(s) phandle for the clock
           (one per cluster)

- reg: register range associated with the cluster clocks

ap_syscon1: system-controller@6f8000 {
	compatible = "marvell,armada-ap806-syscon1", "syscon", "simple-mfd";
	reg = <0x6f8000 0x1000>;

	cpu_clk: clock-cpu@278 {
		compatible = "marvell,ap806-cpu-clock";
		clocks = <&ap_clk 0>, <&ap_clk 1>;
		#clock-cells = <1>;
		reg = <0x278 0xa30>;
	};
};