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authorCaesar Wang <wxt@rock-chips.com>2015-09-08 09:18:20 +0300
committerHeiko Stuebner <heiko@sntech.de>2015-10-06 10:47:32 +0300
commitd64180fd5921be9db9cf63cc12c11086c444c0d0 (patch)
treed89093904c7fb56cee2b1475bfecf8151f338145 /Documentation/devicetree/bindings/soc
parent30c63a9db6052ef10355101bd4f30d2d7437a65d (diff)
downloadlinux-d64180fd5921be9db9cf63cc12c11086c444c0d0.tar.xz
dt-bindings: add document of Rockchip power domains
This add the necessary binding documentation for the power domains found on Rockchip SoCs. Signed-off-by: Caesar Wang <wxt@rock-chips.com> Reviewed-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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+* 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>;
+ /* ... */
+ };