powerpc: Document Freescale power management nodes, and the sleep property.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Documentation/powerpc/dts-bindings/fsl/pmc.txt

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+* Power Management Controller
+
+Properties:
+- compatible: "fsl,<chip>-pmc".
+
+  "fsl,mpc8349-pmc" should be listed for any chip whose PMC is
+  compatible.  "fsl,mpc8313-pmc" should also be listed for any chip
+  whose PMC is compatible, and implies deep-sleep capability.
+
+  "fsl,mpc8548-pmc" should be listed for any chip whose PMC is
+  compatible.  "fsl,mpc8536-pmc" should also be listed for any chip
+  whose PMC is compatible, and implies deep-sleep capability.
+
+  "fsl,mpc8641d-pmc" should be listed for any chip whose PMC is
+  compatible; all statements below that apply to "fsl,mpc8548-pmc" also
+  apply to "fsl,mpc8641d-pmc".
+
+  Compatibility does not include bit assigments in SCCR/PMCDR/DEVDISR; these
+  bit assigments are indicated via the sleep specifier in each device's
+  sleep property.
+
+- reg: For devices compatible with "fsl,mpc8349-pmc", the first resource
+  is the PMC block, and the second resource is the Clock Configuration
+  block.
+
+  For devices compatible with "fsl,mpc8548-pmc", the first resource
+  is a 32-byte block beginning with DEVDISR.
+
+- interrupts: For "fsl,mpc8349-pmc"-compatible devices, the first
+  resource is the PMC block interrupt.
+
+- fsl,mpc8313-wakeup-timer: For "fsl,mpc8313-pmc"-compatible devices,
+  this is a phandle to an "fsl,gtm" node on which timer 4 can be used as
+  a wakeup source from deep sleep.
+
+Sleep specifiers:
+
+  fsl,mpc8349-pmc: Sleep specifiers consist of one cell.  For each bit
+  that is set in the cell, the corresponding bit in SCCR will be saved
+  and cleared on suspend, and restored on resume.  This sleep controller
+  supports disabling and resuming devices at any time.
+
+  fsl,mpc8536-pmc: Sleep specifiers consist of three cells, the third of
+  which will be ORed into PMCDR upon suspend, and cleared from PMCDR
+  upon resume.  The first two cells are as described for fsl,mpc8578-pmc.
+  This sleep controller only supports disabling devices during system
+  sleep, or permanently.
+
+  fsl,mpc8548-pmc: Sleep specifiers consist of one or two cells, the
+  first of which will be ORed into DEVDISR (and the second into
+  DEVDISR2, if present -- this cell should be zero or absent if the
+  hardware does not have DEVDISR2) upon a request for permanent device
+  disabling.  This sleep controller does not support configuring devices
+  to disable during system sleep (unless supported by another compatible
+  match), or dynamically.
+
+Example:
+
+	power@b00 {
+		compatible = "fsl,mpc8313-pmc", "fsl,mpc8349-pmc";
+		reg = <0xb00 0x100 0xa00 0x100>;
+		interrupts = <80 8>;
+	};