[PATCH v18 1/4] dt-bindings: add document of Rockchip power domains
From: Caesar Wang <hidden>
Date: 2015-09-08 06:20:37
Also in:
linux-devicetree, linux-rockchip, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
This add the necessary binding documentation for the power domains found on Rockchip SoCs. Signed-off-by: jinkun.hong <redacted> Signed-off-by: Caesar Wang <redacted> --- Changes in v18: - remove the notes of domains from dt-binding. Changes in v17: - add the decription in detail for RK3288 SoCs. Changes in v16: - remove the pmu node. Changes in v15: None Changes in v14: None Changes in v13: None Changes in v12: None Changes in v11: None Changes in v10: None Changes in v9: - add document decription. Changes in v8: - document go back to v2. Changes in v7: None Changes in v6: None Changes in v5: None Changes in v4: None Changes in v3: - DT structure has changed. Changes in v2: - move clocks to "optional". .../bindings/soc/rockchip/power_domain.txt | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/rockchip/power_domain.txt
diff --git a/Documentation/devicetree/bindings/soc/rockchip/power_domain.txt b/Documentation/devicetree/bindings/soc/rockchip/power_domain.txt
new file mode 100644
index 0000000..4be3418
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/rockchip/power_domain.txt@@ -0,0 +1,46 @@ +* Rockchip Power Domains + +Rockchip processors include support for multiple power domains which can be +powered up/down by software based on different application scenes to save power. + +Required properties for power domain controller: +- compatible: Should be one of the following. + "rockchip,rk3288-power-controller" - for RK3288 SoCs. +- #power-domain-cells: Number of cells in a power-domain specifier. + Should be 1 for multiple PM domains. +- #address-cells: Should be 1. +- #size-cells: Should be 0. + +Required properties for power domain sub nodes: +- reg: index of the power domain, should use macros in: + "include/dt-bindings/power-domain/rk3288.h" - for RK3288 type power domain. +- clocks (optional): phandles to clocks which need to be enabled while power domain + switches state. + +Example: + + power: power-controller { + compatible = "rockchip,rk3288-power-controller"; + #power-domain-cells = <1>; + #address-cells = <1>; + #size-cells = <0>; + + pd_gpu { + reg = <RK3288_PD_GPU>; + clocks = <&cru ACLK_GPU>; + }; + }; + +Node of a device using power domains must have a power-domains property, +containing a phandle to the power device node and an index specifying which +power domain to use. +The index should use macros in: + "include/dt-bindings/power-domain/rk3288.h" - for rk3288 type power domain. + +Example of the node using power domain: + + node { + /* ... */ + power-domains = <&power RK3288_PD_GPU>; + /* ... */ + };
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1.9.1