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The Amlogic Meson8/Meson8b/Meson8m2 clock controller provides some reset lines. These are used for example to boot the secondary CPU cores. This patch describes the reset controller which is embedded into the clock controller on these SoCs. A header file is provided which provides preprocessor macros for each reset line (to make the .dts files easier to read). Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
51 lines
1.5 KiB
Plaintext
51 lines
1.5 KiB
Plaintext
* Amlogic Meson8, Meson8b and Meson8m2 Clock and Reset Unit
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The Amlogic Meson8 / Meson8b / Meson8m2 clock controller generates and
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supplies clock to various controllers within the SoC.
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Required Properties:
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- compatible: must be one of:
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- "amlogic,meson8-clkc" for Meson8 (S802) SoCs
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- "amlogic,meson8b-clkc" for Meson8 (S805) SoCs
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- "amlogic,meson8m2-clkc" for Meson8m2 (S812) SoCs
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- reg: it must be composed by two tuples:
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0) physical base address of the xtal register and length of memory
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mapped region.
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1) physical base address of the clock controller and length of memory
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mapped region.
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- #clock-cells: should be 1.
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- #reset-cells: should be 1.
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Each clock is assigned an identifier and client nodes can use this identifier
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to specify the clock which they consume. All available clocks are defined as
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preprocessor macros in the dt-bindings/clock/meson8b-clkc.h header and can be
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used in device tree sources.
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Similarly a preprocessor macro for each reset line is defined in
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dt-bindings/reset/amlogic,meson8b-clkc-reset.h (which can be used from the
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device tree sources).
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Example: Clock controller node:
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clkc: clock-controller@c1104000 {
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compatible = "amlogic,meson8b-clkc";
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reg = <0xc1108000 0x4>, <0xc1104000 0x460>;
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#clock-cells = <1>;
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#reset-cells = <1>;
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};
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Example: UART controller node that consumes the clock generated by the clock
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controller:
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uart_AO: serial@c81004c0 {
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compatible = "amlogic,meson-uart";
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reg = <0xc81004c0 0x14>;
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interrupts = <0 90 1>;
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clocks = <&clkc CLKID_CLK81>;
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status = "disabled";
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};
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