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Documentation: dt: binding: fsl: add devicetree binding for describing RCPM 

RCPM is the Run Control and Power Management module performs all
device-level tasks associated with device run control and power
management.

Add this for freescale powerpc platform and layerscape platform.

Signed-off-by: Chenhui Zhao <chenhui.zhao@freescale.com>
Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
[scottwood: s/pointer/phandle and "disabled" status from example]
Signed-off-by: Scott Wood <oss@buserror.net>
This commit is contained in:
Wang Dongsheng 2015-10-26 14:44:12 +08:00 committed by Scott Wood
parent 5a8847c83c
commit d64716caf7
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Documentation/devicetree/bindings/soc/fsl/rcpm.txt Normal file
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* 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,<chip>-rcpm",
such as:
* "fsl,p2041-rcpm"
* "fsl,p5020-rcpm"
* "fsl,t4240-rcpm"
Chassis-version strings are of the form "fsl,qoriq-rcpm-<version>",
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>;
};