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author | Geert Uytterhoeven <geert+renesas@glider.be> | 2014-12-03 14:41:41 +0100 |
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committer | Simon Horman <horms+renesas@verge.net.au> | 2015-01-13 11:02:23 +0900 |
commit | 3b8df3903465803f47902fe0510628efdd6ab5a3 (patch) | |
tree | cdee0c6c12de277a5e66a44b53ae877157c6ed35 /Documentation | |
parent | f76452fdfe3fdd930b83d108158d4f0507a32f5f (diff) | |
download | linux-stable-3b8df3903465803f47902fe0510628efdd6ab5a3.tar.gz linux-stable-3b8df3903465803f47902fe0510628efdd6ab5a3.tar.bz2 linux-stable-3b8df3903465803f47902fe0510628efdd6ab5a3.zip |
PM / Domains: Add DT bindings for the R-Mobile System Controller
The Renesas R-Mobile System Controller provides a.o. power management
support, following the generic PM domain bindings in
Documentation/devicetree/bindings/power/power_domain.txt.
For now this supports the R-Mobile A1 (r8a7740) only, but it should be
sufficiently generic to handle other members of the SH-Mobile/R-Mobile
family in the future.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt b/Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt new file mode 100644 index 000000000000..2460476808e9 --- /dev/null +++ b/Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt @@ -0,0 +1,98 @@ +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-r8a7740" (R-Mobile A1) +- 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.txt. + +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>; + }; |