From mboxrd@z Thu Jan 1 00:00:00 1970 From: "jinkun.hong" Subject: [PATCH 2/3] dt-bindings: add document of Rockchip power domain Date: Mon, 22 Sep 2014 19:55:15 -0700 Message-ID: <1411440916-6830-3-git-send-email-jinkun.hong@rock-chips.com> References: <1411440916-6830-1-git-send-email-jinkun.hong@rock-chips.com> Return-path: In-Reply-To: <1411440916-6830-1-git-send-email-jinkun.hong@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-rockchip@lists.infradead.org, Heiko Stuebner , Russell King , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Grant Likely , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Randy Dunlap , linux-doc@vger.kernel.org Cc: "jinkun.hong" , Jack Dai , Caesar Wang List-Id: devicetree@vger.kernel.org From: "jinkun.hong" Signed-off-by: Jack Dai Signed-off-by: Caesar Wang Signed-off-by: jinkun.hong --- .../bindings/arm/rockchip/power_domain.txt | 48 ++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/rockchip/power_domain.txt diff --git a/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt b/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt new file mode 100644 index 0000000..2a80d3f --- /dev/null +++ b/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt @@ -0,0 +1,48 @@ +* 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 type power domain. +- #power-domain-cells: Number of cells in a power-domain specifier. + should be 1. +- rockchip,pmu: phandle referencing a syscon providing the pmu registers +- #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: 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>; + rockchip,pmu = <&pmu>; + #address-cells = <1>; + #size-cells = <0>; + + pd_gpu { + reg = ; + 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>; + /* ... */ + }; -- 1.7.9.5