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author | Sascha Hauer <s.hauer@pengutronix.de> | 2018-06-21 13:44:30 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-06-22 08:16:13 +0200 |
commit | e4067b75fb6ca83a58b2c342a0b3ee12e1223c4e (patch) | |
tree | be013bf46292f4696ac776bc91c1cf35b7adab24 /dts/Bindings/clock/actions,s900-cmu.txt | |
parent | fe040e0977fab29216f5039e8f9b04e6dbec859a (diff) | |
download | barebox-e4067b75fb6ca83a58b2c342a0b3ee12e1223c4e.tar.gz barebox-e4067b75fb6ca83a58b2c342a0b3ee12e1223c4e.tar.xz |
dts: update to v4.18-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/clock/actions,s900-cmu.txt')
-rw-r--r-- | dts/Bindings/clock/actions,s900-cmu.txt | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/dts/Bindings/clock/actions,s900-cmu.txt b/dts/Bindings/clock/actions,s900-cmu.txt new file mode 100644 index 0000000000..93e4fb827c --- /dev/null +++ b/dts/Bindings/clock/actions,s900-cmu.txt @@ -0,0 +1,47 @@ +* Actions S900 Clock Management Unit (CMU) + +The Actions S900 clock management unit generates and supplies clock to various +controllers within the SoC. The clock binding described here is applicable to +S900 SoC. + +Required Properties: + +- compatible: should be "actions,s900-cmu" +- reg: physical base address of the controller and length of memory mapped + region. +- clocks: Reference to the parent clocks ("hosc", "losc") +- #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 +dt-bindings/clock/actions,s900-cmu.h header and can be used in device +tree sources. + +External clocks: + +The hosc clock used as input for the plls is generated outside the SoC. It is +expected that it is defined using standard clock bindings as "hosc". + +Actions S900 CMU also requires one more clock: + - "losc" - internal low frequency oscillator + +Example: Clock Management Unit node: + + cmu: clock-controller@e0160000 { + compatible = "actions,s900-cmu"; + reg = <0x0 0xe0160000 0x0 0x1000>; + clocks = <&hosc>, <&losc>; + #clock-cells = <1>; + }; + +Example: UART controller node that consumes clock generated by the clock +management unit: + + uart: serial@e012a000 { + compatible = "actions,s900-uart", "actions,owl-uart"; + reg = <0x0 0xe012a000 0x0 0x2000>; + interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&cmu CLK_UART5>; + }; |