57 lines
1.8 KiB
Plaintext
57 lines
1.8 KiB
Plaintext
Texas Instruments clkctrl clock binding
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Texas Instruments SoCs can have a clkctrl clock controller for each
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interconnect target module. The clkctrl clock controller manages functional
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and interface clocks for each module. Each clkctrl controller can also
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gate one or more optional functional clocks for a module, and can have one
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or more clock muxes. There is a clkctrl clock controller typically for each
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interconnect target module on omap4 and later variants.
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The clock consumers can specify the index of the clkctrl clock using
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the hardware offset from the clkctrl instance register space. The optional
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clocks can be specified by clkctrl hardware offset and the index of the
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optional clock.
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For more information, please see the Linux clock framework binding at
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Documentation/devicetree/bindings/clock/clock-bindings.txt.
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Required properties :
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- compatible : shall be "ti,clkctrl"
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- #clock-cells : shall contain 2 with the first entry being the instance
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offset from the clock domain base and the second being the
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clock index
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Example: Clock controller node on omap 4430:
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&cm2 {
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l4per: cm@1400 {
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cm_l4per@0 {
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cm_l4per_clkctrl: clk@20 {
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compatible = "ti,clkctrl";
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reg = <0x20 0x1b0>;
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#clock-cells = <2>;
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};
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};
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};
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};
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Example: Preprocessor helper macros in dt-bindings/clock/ti-clkctrl.h
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#define OMAP4_CLKCTRL_OFFSET 0x20
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#define OMAP4_CLKCTRL_INDEX(offset) ((offset) - OMAP4_CLKCTRL_OFFSET)
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#define MODULEMODE_HWCTRL 1
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#define MODULEMODE_SWCTRL 2
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#define OMAP4_GPTIMER10_CLKTRL OMAP4_CLKCTRL_INDEX(0x28)
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#define OMAP4_GPTIMER11_CLKTRL OMAP4_CLKCTRL_INDEX(0x30)
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#define OMAP4_GPTIMER2_CLKTRL OMAP4_CLKCTRL_INDEX(0x38)
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...
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#define OMAP4_GPIO2_CLKCTRL OMAP_CLKCTRL_INDEX(0x60)
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Example: Clock consumer node for GPIO2:
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&gpio2 {
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clocks = <&cm_l4per_clkctrl OMAP4_GPIO2_CLKCTRL 0
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&cm_l4per_clkctrl OMAP4_GPIO2_CLKCTRL 8>;
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};
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