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-ARM System Controller ICST clocks
-
-The ICS525 and ICS307 oscillators are produced by Integrated Devices
-Technology (IDT). ARM integrated these oscillators deeply into their
-reference designs by adding special control registers that manage such
-oscillators to their system controllers.
-
-The various ARM system controllers contain logic to serialize and initialize
-an ICST clock request after a write to the 32 bit register at an offset
-into the system controller. Furthermore, to even be able to alter one of
-these frequencies, the system controller must first be unlocked by
-writing a special token to another offset in the system controller.
-
-Some ARM hardware contain special versions of the serial interface that only
-connects the low 8 bits of the VDW (missing one bit), hardwires RDW to
-different values and sometimes also hardwire the output divider. They
-therefore have special compatible strings as per this table (the OD value is
-the value on the pins, not the resulting output divider):
-
-Hardware variant: RDW OD VDW
-
-Integrator/AP 22 1 Bit 8 0, rest variable
-integratorap-cm
-
-Integrator/AP 46 3 Bit 8 0, rest variable
-integratorap-sys
-
-Integrator/AP 22 or 1 17 or (33 or 25 MHz)
-integratorap-pci 14 1 14
-
-Integrator/CP 22 variable Bit 8 0, rest variable
-integratorcp-cm-core
-
-Integrator/CP 22 variable Bit 8 0, rest variable
-integratorcp-cm-mem
-
-The ICST oscillator must be provided inside a system controller node.
-
-Required properties:
-- compatible: must be one of
- "arm,syscon-icst525"
- "arm,syscon-icst307"
- "arm,syscon-icst525-integratorap-cm"
- "arm,syscon-icst525-integratorap-sys"
- "arm,syscon-icst525-integratorap-pci"
- "arm,syscon-icst525-integratorcp-cm-core"
- "arm,syscon-icst525-integratorcp-cm-mem"
-- lock-offset: the offset address into the system controller where the
- unlocking register is located
-- vco-offset: the offset address into the system controller where the
- ICST control register is located (even 32 bit address)
-- #clock-cells: must be <0>
-- clocks: parent clock, since the ICST needs a parent clock to derive its
- frequency from, this attribute is compulsory.
-
-Example:
-
-syscon: syscon@10000000 {
- compatible = "syscon";
- reg = <0x10000000 0x1000>;
-
- oscclk0: osc0@c {
- compatible = "arm,syscon-icst307";
- #clock-cells = <0>;
- lock-offset = <0x20>;
- vco-offset = <0x0c>;
- clocks = <&xtal24mhz>;
- };
- (...)
-};