1855f06a1SMartin Blumenstingl* Amlogic Meson8, Meson8b and Meson8m2 Clock and Reset Unit 212545fa3SCarlo Caione 3855f06a1SMartin BlumenstinglThe Amlogic Meson8 / Meson8b / Meson8m2 clock controller generates and 4855f06a1SMartin Blumenstinglsupplies clock to various controllers within the SoC. 512545fa3SCarlo Caione 612545fa3SCarlo CaioneRequired Properties: 712545fa3SCarlo Caione 8855f06a1SMartin Blumenstingl- compatible: must be one of: 9855f06a1SMartin Blumenstingl - "amlogic,meson8-clkc" for Meson8 (S802) SoCs 10855f06a1SMartin Blumenstingl - "amlogic,meson8b-clkc" for Meson8 (S805) SoCs 11855f06a1SMartin Blumenstingl - "amlogic,meson8m2-clkc" for Meson8m2 (S812) SoCs 1212545fa3SCarlo Caione- reg: it must be composed by two tuples: 1312545fa3SCarlo Caione 0) physical base address of the xtal register and length of memory 1412545fa3SCarlo Caione mapped region. 1512545fa3SCarlo Caione 1) physical base address of the clock controller and length of memory 1612545fa3SCarlo Caione mapped region. 1712545fa3SCarlo Caione 1812545fa3SCarlo Caione- #clock-cells: should be 1. 1912545fa3SCarlo Caione 2012545fa3SCarlo CaioneEach clock is assigned an identifier and client nodes can use this identifier 2112545fa3SCarlo Caioneto specify the clock which they consume. All available clocks are defined as 2212545fa3SCarlo Caionepreprocessor macros in the dt-bindings/clock/meson8b-clkc.h header and can be 2312545fa3SCarlo Caioneused in device tree sources. 2412545fa3SCarlo Caione 2512545fa3SCarlo CaioneExample: Clock controller node: 2612545fa3SCarlo Caione 2712545fa3SCarlo Caione clkc: clock-controller@c1104000 { 2812545fa3SCarlo Caione #clock-cells = <1>; 2912545fa3SCarlo Caione compatible = "amlogic,meson8b-clkc"; 3012545fa3SCarlo Caione reg = <0xc1108000 0x4>, <0xc1104000 0x460>; 3112545fa3SCarlo Caione }; 3212545fa3SCarlo Caione 3312545fa3SCarlo Caione 3412545fa3SCarlo CaioneExample: UART controller node that consumes the clock generated by the clock 3512545fa3SCarlo Caione controller: 3612545fa3SCarlo Caione 3712545fa3SCarlo Caione uart_AO: serial@c81004c0 { 3812545fa3SCarlo Caione compatible = "amlogic,meson-uart"; 3912545fa3SCarlo Caione reg = <0xc81004c0 0x14>; 4012545fa3SCarlo Caione interrupts = <0 90 1>; 4112545fa3SCarlo Caione clocks = <&clkc CLKID_CLK81>; 4212545fa3SCarlo Caione status = "disabled"; 4312545fa3SCarlo Caione }; 44