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authorCarlo Caione <carlo@endlessm.com>2015-06-01 13:13:54 +0200
committerStephen Boyd <sboyd@codeaurora.org>2015-06-05 17:22:09 -0700
commit12545fa33ad3363c639ec56bb84c8a58cfbcf65b (patch)
tree2cccb409765aab97221116440d7b37679fd6db88 /Documentation/devicetree
parent7a29a869434e8b7a71972227f0920e2f8ea777bd (diff)
downloadop-kernel-dev-12545fa33ad3363c639ec56bb84c8a58cfbcf65b.zip
op-kernel-dev-12545fa33ad3363c639ec56bb84c8a58cfbcf65b.tar.gz
clk: meson: Document bindings for Meson8b clock controller
Add documentation for the clock controller. Signed-off-by: Carlo Caione <carlo@endlessm.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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+* Amlogic Meson8b Clock and Reset Unit
+
+The Amlogic Meson8b clock controller generates and supplies clock to various
+controllers within the SoC.
+
+Required Properties:
+
+- compatible: should be "amlogic,meson8b-clkc"
+- 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.
+
+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.
+
+Example: Clock controller node:
+
+ clkc: clock-controller@c1104000 {
+ #clock-cells = <1>;
+ compatible = "amlogic,meson8b-clkc";
+ reg = <0xc1108000 0x4>, <0xc1104000 0x460>;
+ };
+
+
+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>;
+ status = "disabled";
+ };
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