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