Kernel-4.18.0-80.el8_rcp

• Run Control and Power Management

---

The RCPM performs all device-level tasks associated with device run control
and power management.

Required properites:

• reg : Offset and length of the register set of the RCPM block.

• fsl,#rcpm-wakeup-cells : The number of IPPDEXPCR register cells in the
  fsl,rcpm-wakeup property.

• compatible : Must contain a chip-specific RCPM block compatible string
  and (if applicable) may contain a chassis-version RCPM compatible
  string. Chip-specific strings are of the form “fsl,-rcpm”,
  such as:

  • “fsl,p2041-rcpm”
  • “fsl,p5020-rcpm”
  • “fsl,t4240-rcpm”

  Chassis-version strings are of the form “fsl,qoriq-rcpm-“,
  such as:

  • “fsl,qoriq-rcpm-1.0”: for chassis 1.0 rcpm
  • “fsl,qoriq-rcpm-2.0”: for chassis 2.0 rcpm
  • “fsl,qoriq-rcpm-2.1”: for chassis 2.1 rcpm

All references to “1.0” and “2.0” refer to the QorIQ chassis version to
which the chip complies.
Chassis Version Example Chips

---

1.0 p4080, p5020, p5040, p2041, p3041
2.0 t4240, b4860, b4420
2.1 t1040, ls1021

Example:
The RCPM node for T4240:
rcpm: global-utilities@e2000 {
compatible = “fsl,t4240-rcpm”, “fsl,qoriq-rcpm-2.0”;
reg = <0xe2000 0x1000>;
fsl,#rcpm-wakeup-cells = <2>;
};

• Freescale RCPM Wakeup Source Device Tree Bindings

---

Required fsl,rcpm-wakeup property should be added to a device node if the device
can be used as a wakeup source.

• fsl,rcpm-wakeup: Consists of a phandle to the rcpm node and the IPPDEXPCR
  register cells. The number of IPPDEXPCR register cells is defined in
  “fsl,#rcpm-wakeup-cells” in the rcpm node. The first register cell is
  the bit mask that should be set in IPPDEXPCR0, and the second register
  cell is for IPPDEXPCR1, and so on.

  Note: IPPDEXPCR(IP Powerdown Exception Control Register) provides a
  mechanism for keeping certain blocks awake during STANDBY and MEM, in
  order to use them as wake-up sources.

Example:
lpuart0: serial@2950000 {
compatible = “fsl,ls1021a-lpuart”;
reg = <0x0 0x2950000 0x0 0x1000>;
interrupts = <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&sysclk>;
clock-names = “ipg”;
fsl,rcpm-wakeup = <&rcpm 0x0 0x40000000>;
};