Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
1 * Samsung Exynos Power Domains 2 3 Exynos processors include support for multiple power domains which are used 4 to gate power to one or more peripherals on the processor. 5 6 Required Properties: 7 - compatible: should be one of the following. 8 * samsung,exynos4210-pd - for exynos4210 type power domain. 9 * samsung,exynos5433-pd - for exynos5433 type power domain. 10 - reg: physical base address of the controller and length of memory mapped 11 region. 12 - #power-domain-cells: number of cells in power domain specifier; 13 must be 0. 14 15 Optional Properties: 16 - label: Human readable string with domain name. Will be visible in userspace 17 to let user to distinguish between multiple domains in SoC. 18 - clocks: List of clock handles. The parent clocks of the input clocks to the 19 devices in this power domain are set to oscclk before power gating 20 and restored back after powering on a domain. This is required for 21 all domains which are powered on and off and not required for unused 22 domains. 23 - clock-names: The following clocks can be specified: 24 - oscclk: Oscillator clock. 25 - clkN: Input clocks to the devices in this power domain. These clocks 26 will be reparented to oscclk before switching power domain off. 27 Their original parent will be brought back after turning on 28 the domain. Maximum of 4 clocks (N = 0 to 3) are supported. 29 - asbN: Clocks required by asynchronous bridges (ASB) present in 30 the power domain. These clock should be enabled during power 31 domain on/off operations. 32 - power-domains: phandle pointing to the parent power domain, for more details 33 see Documentation/devicetree/bindings/power/power_domain.txt 34 35 Node of a device using power domains must have a power-domains property 36 defined with a phandle to respective power domain. 37 38 Example: 39 40 lcd0: power-domain-lcd0 { 41 compatible = "samsung,exynos4210-pd"; 42 reg = <0x10023C00 0x10>; 43 #power-domain-cells = <0>; 44 label = "LCD0"; 45 }; 46 47 mfc_pd: power-domain@10044060 { 48 compatible = "samsung,exynos4210-pd"; 49 reg = <0x10044060 0x20>; 50 clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MOUT_USER_ACLK333>; 51 clock-names = "oscclk", "clk0"; 52 #power-domain-cells = <0>; 53 label = "MFC"; 54 }; 55 56 See Documentation/devicetree/bindings/power/power_domain.txt for description 57 of consumer-side bindings.