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DT bindings for the Renesas R-Mobile System Controller
== System Controller Node ==
The R-Mobile System Controller provides the following functions:
- Boot mode management,
- Reset generation,
- Power management.
Required properties:
- compatible: Should be "renesas,sysc-<soctype>", "renesas,sysc-rmobile" as
fallback.
Examples with soctypes are:
- "renesas,sysc-r8a73a4" (R-Mobile APE6)
- "renesas,sysc-r8a7740" (R-Mobile A1)
- "renesas,sysc-sh73a0" (SH-Mobile AG5)
- reg: Two address start and address range blocks for the device:
- The first block refers to the normally accessible registers,
- the second block refers to the registers protected by the HPB
semaphore.
Optional nodes:
- pm-domains: This node contains a hierarchy of PM domain nodes, which should
match the Power Area Hierarchy in the Power Domain Specifications section of
the device's datasheet.
== PM Domain Nodes ==
Each of the PM domain nodes represents a PM domain, as documented by the
generic PM domain bindings in
Documentation/devicetree/bindings/power/power-domain.yaml.
The nodes should be named by the real power area names, and thus their names
should be unique.
Required properties:
- #power-domain-cells: Must be 0.
Optional properties:
- reg: If the PM domain is not always-on, this property must contain the bit
index number for the corresponding power area in the various Power
Control and Status Registers. The parent's node must contain the
following two properties:
- #address-cells: Must be 1,
- #size-cells: Must be 0.
If the PM domain is always-on, this property must be omitted.
Example:
This shows a subset of the r8a7740 PM domain hierarchy, containing the
C5 "always-on" domain, 2 of its subdomains (A4S and A4SU), and the A3SP domain,
which is a subdomain of A4S.
sysc: system-controller@e6180000 {
compatible = "renesas,sysc-r8a7740", "renesas,sysc-rmobile";
reg = <0xe6180000 0x8000>, <0xe6188000 0x8000>;
pm-domains {
pd_c5: c5 {
#address-cells = <1>;
#size-cells = <0>;
#power-domain-cells = <0>;
pd_a4s: a4s@10 {
reg = <10>;
#address-cells = <1>;
#size-cells = <0>;
#power-domain-cells = <0>;
pd_a3sp: a3sp@11 {
reg = <11>;
#power-domain-cells = <0>;
};
};
pd_a4su: a4su@20 {
reg = <20>;
#power-domain-cells = <0>;
};
};
};
};
== PM Domain Consumers ==
Hardware blocks belonging to a PM domain should contain a "power-domains"
property that is a phandle pointing to the corresponding PM domain node.
Example:
tpu: pwm@e6600000 {
compatible = "renesas,tpu-r8a7740", "renesas,tpu";
reg = <0xe6600000 0x100>;
clocks = <&mstp3_clks R8A7740_CLK_TPU0>;
power-domains = <&pd_a3sp>;
#pwm-cells = <3>;
};
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