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| Device Tree Clock bindings for ATL (Audio Tracking Logic) of DRA7 SoC. | ||
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| The ATL IP is used to generate clock to be used to synchronize baseband and | ||
| audio codec. A single ATL IP provides four ATL clock instances sharing the same | ||
| functional clock but can be configured to provide different clocks. | ||
| ATL can maintain a clock averages to some desired frequency based on the bws/aws | ||
| signals - can compensate the drift between the two ws signal. | ||
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| In order to provide the support for ATL and it's output clocks (which can be used | ||
| internally within the SoC or external components) two sets of bindings is needed: | ||
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| Clock tree binding: | ||
| This binding uses the common clock binding[1]. | ||
| To be able to integrate the ATL clocks with DT clock tree. | ||
| Provides ccf level representation of the ATL clocks to be used by drivers. | ||
| Since the clock instances are part of a single IP this binding is used as a node | ||
| for the DT clock tree, the IP driver is needed to handle the actual configuration | ||
| of the IP. | ||
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| [1] Documentation/devicetree/bindings/clock/clock-bindings.txt | ||
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| Required properties: | ||
| - compatible : shall be "ti,dra7-atl-clock" | ||
| - #clock-cells : from common clock binding; shall be set to 0. | ||
| - clocks : link phandles to functional clock of ATL | ||
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| Binding for the IP driver: | ||
| This binding is used to configure the IP driver which is going to handle the | ||
| configuration of the IP for the ATL clock instances. | ||
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| Required properties: | ||
| - compatible : shall be "ti,dra7-atl" | ||
| - reg : base address for the ATL IP | ||
| - ti,provided-clocks : List of phandles to the clocks associated with the ATL | ||
| - clocks : link phandles to functional clock of ATL | ||
| - clock-names : Shall be set to "fck" | ||
| - ti,hwmods : Shall be set to "atl" | ||
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| Optional properties: | ||
| Configuration of ATL instances: | ||
| - atl{0/1/2/3} { | ||
| - bws : Baseband word select signal selection | ||
| - aws : Audio word select signal selection | ||
| }; | ||
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| For valid word select signals, see the dt-bindings/clk/ti-dra7-atl.h include | ||
| file. | ||
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| Examples: | ||
| /* clock bindings for atl provided clocks */ | ||
| atl_clkin0_ck: atl_clkin0_ck { | ||
| #clock-cells = <0>; | ||
| compatible = "ti,dra7-atl-clock"; | ||
| clocks = <&atl_gfclk_mux>; | ||
| }; | ||
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| atl_clkin1_ck: atl_clkin1_ck { | ||
| #clock-cells = <0>; | ||
| compatible = "ti,dra7-atl-clock"; | ||
| clocks = <&atl_gfclk_mux>; | ||
| }; | ||
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| atl_clkin2_ck: atl_clkin2_ck { | ||
| #clock-cells = <0>; | ||
| compatible = "ti,dra7-atl-clock"; | ||
| clocks = <&atl_gfclk_mux>; | ||
| }; | ||
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| atl_clkin3_ck: atl_clkin3_ck { | ||
| #clock-cells = <0>; | ||
| compatible = "ti,dra7-atl-clock"; | ||
| clocks = <&atl_gfclk_mux>; | ||
| }; | ||
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| /* binding for the IP */ | ||
| atl: atl@4843c000 { | ||
| compatible = "ti,dra7-atl"; | ||
| reg = <0x4843c000 0x3ff>; | ||
| ti,hwmods = "atl"; | ||
| ti,provided-clocks = <&atl_clkin0_ck>, <&atl_clkin1_ck>, | ||
| <&atl_clkin2_ck>, <&atl_clkin3_ck>; | ||
| clocks = <&atl_gfclk_mux>; | ||
| clock-names = "fck"; | ||
| status = "disabled"; | ||
| }; | ||
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| #include <dt-bindings/clk/ti-dra7-atl.h> | ||
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| &atl { | ||
| status = "okay"; | ||
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| atl2 { | ||
| bws = <DRA7_ATL_WS_MCASP2_FSX>; | ||
| aws = <DRA7_ATL_WS_MCASP3_FSX>; | ||
| }; | ||
| }; |
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