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-rw-r--r-- | Documentation/devicetree/bindings/clock/ti-clkctrl.txt | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/clock/ti-clkctrl.txt b/Documentation/devicetree/bindings/clock/ti-clkctrl.txt new file mode 100644 index 000000000..d20db7974 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/ti-clkctrl.txt @@ -0,0 +1,63 @@ +Texas Instruments clkctrl clock binding + +Texas Instruments SoCs can have a clkctrl clock controller for each +interconnect target module. The clkctrl clock controller manages functional +and interface clocks for each module. Each clkctrl controller can also +gate one or more optional functional clocks for a module, and can have one +or more clock muxes. There is a clkctrl clock controller typically for each +interconnect target module on omap4 and later variants. + +The clock consumers can specify the index of the clkctrl clock using +the hardware offset from the clkctrl instance register space. The optional +clocks can be specified by clkctrl hardware offset and the index of the +optional clock. + +For more information, please see the Linux clock framework binding at +Documentation/devicetree/bindings/clock/clock-bindings.txt. + +Required properties : +- compatible : shall be "ti,clkctrl" or a clock domain specific name: + "ti,clkctrl-l4-cfg" + "ti,clkctrl-l4-per" + "ti,clkctrl-l4-secure" + "ti,clkctrl-l4-wkup" +- clock-output-names : from common clock binding +- #clock-cells : shall contain 2 with the first entry being the instance + offset from the clock domain base and the second being the + clock index +- reg : clock registers + +Example: Clock controller node on omap 4430: + +&cm2 { + l4per: cm@1400 { + cm_l4per@0 { + cm_l4per_clkctrl: clock@20 { + compatible = "ti,clkctrl"; + clock-output-names = "l4_per"; + reg = <0x20 0x1b0>; + #clock-cells = <2>; + }; + }; + }; +}; + +Example: Preprocessor helper macros in dt-bindings/clock/ti-clkctrl.h + +#define OMAP4_CLKCTRL_OFFSET 0x20 +#define OMAP4_CLKCTRL_INDEX(offset) ((offset) - OMAP4_CLKCTRL_OFFSET) +#define MODULEMODE_HWCTRL 1 +#define MODULEMODE_SWCTRL 2 + +#define OMAP4_GPTIMER10_CLKTRL OMAP4_CLKCTRL_INDEX(0x28) +#define OMAP4_GPTIMER11_CLKTRL OMAP4_CLKCTRL_INDEX(0x30) +#define OMAP4_GPTIMER2_CLKTRL OMAP4_CLKCTRL_INDEX(0x38) +... +#define OMAP4_GPIO2_CLKCTRL OMAP_CLKCTRL_INDEX(0x60) + +Example: Clock consumer node for GPIO2: + +&gpio2 { + clocks = <&cm_l4per_clkctrl OMAP4_GPIO2_CLKCTRL 0 + &cm_l4per_clkctrl OMAP4_GPIO2_CLKCTRL 8>; +}; |