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Diffstat (limited to 'Documentation/devicetree/bindings/clock/amlogic,meson8b-clkc.txt')
-rw-r--r-- | Documentation/devicetree/bindings/clock/amlogic,meson8b-clkc.txt | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/clock/amlogic,meson8b-clkc.txt b/Documentation/devicetree/bindings/clock/amlogic,meson8b-clkc.txt new file mode 100644 index 000000000..b455c5aa9 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/amlogic,meson8b-clkc.txt @@ -0,0 +1,49 @@ +* Amlogic Meson8, Meson8b and Meson8m2 Clock and Reset Unit + +The Amlogic Meson8 / Meson8b / Meson8m2 clock controller generates and +supplies clock to various controllers within the SoC. + +Required Properties: + +- compatible: must be one of: + - "amlogic,meson8-clkc" for Meson8 (S802) SoCs + - "amlogic,meson8b-clkc" for Meson8 (S805) SoCs + - "amlogic,meson8m2-clkc" for Meson8m2 (S812) SoCs +- reg: it must be composed by two tuples: + 0) physical base address of the xtal register and length of memory + mapped region. + 1) physical base address of the clock controller and length of memory + mapped region. + +- #clock-cells: should be 1. +- #reset-cells: should be 1. + +Each clock is assigned an identifier and client nodes can use this identifier +to specify the clock which they consume. All available clocks are defined as +preprocessor macros in the dt-bindings/clock/meson8b-clkc.h header and can be +used in device tree sources. + +Similarly a preprocessor macro for each reset line is defined in +dt-bindings/reset/amlogic,meson8b-clkc-reset.h (which can be used from the +device tree sources). + + +Example: Clock controller node: + + clkc: clock-controller@c1104000 { + compatible = "amlogic,meson8b-clkc"; + reg = <0xc1108000 0x4>, <0xc1104000 0x460>; + #clock-cells = <1>; + #reset-cells = <1>; + }; + + +Example: UART controller node that consumes the clock generated by the clock + controller: + + uart_AO: serial@c81004c0 { + compatible = "amlogic,meson-uart"; + reg = <0xc81004c0 0x14>; + interrupts = <0 90 1>; + clocks = <&clkc CLKID_CLK81>; + }; |