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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/clock/samsung,exynosautov920-clock.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Samsung ExynosAuto v920 SoC clock controller8 9maintainers:10 - Sunyeal Hong <sunyeal.hong@samsung.com>11 - Chanwoo Choi <cw00.choi@samsung.com>12 - Krzysztof Kozlowski <krzk@kernel.org>13 - Sylwester Nawrocki <s.nawrocki@samsung.com>14 15description: |16 ExynosAuto v920 clock controller is comprised of several CMU units, generating17 clocks for different domains. Those CMU units are modeled as separate device18 tree nodes, and might depend on each other. Root clocks in that clock tree are19 two external clocks:: OSCCLK/XTCXO (38.4 MHz) and RTCCLK/XrtcXTI (32768 Hz).20 The external OSCCLK must be defined as fixed-rate clock in dts.21 22 CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and23 dividers; all other clocks of function blocks (other CMUs) are usually24 derived from CMU_TOP.25 26 Each clock is assigned an identifier and client nodes can use this identifier27 to specify the clock which they consume. All clocks available for usage28 in clock consumer nodes are defined as preprocessor macros in29 'include/dt-bindings/clock/samsung,exynosautov920.h' header.30 31properties:32 compatible:33 enum:34 - samsung,exynosautov920-cmu-top35 - samsung,exynosautov920-cmu-peric036 - samsung,exynosautov920-cmu-peric137 - samsung,exynosautov920-cmu-misc38 - samsung,exynosautov920-cmu-hsi039 - samsung,exynosautov920-cmu-hsi140 41 clocks:42 minItems: 143 maxItems: 444 45 clock-names:46 minItems: 147 maxItems: 448 49 "#clock-cells":50 const: 151 52 reg:53 maxItems: 154 55allOf:56 - if:57 properties:58 compatible:59 contains:60 const: samsung,exynosautov920-cmu-top61 62 then:63 properties:64 clocks:65 items:66 - description: External reference clock (38.4 MHz)67 68 clock-names:69 items:70 - const: oscclk71 72 - if:73 properties:74 compatible:75 contains:76 enum:77 - samsung,exynosautov920-cmu-peric078 - samsung,exynosautov920-cmu-peric179 80 then:81 properties:82 clocks:83 items:84 - description: External reference clock (38.4 MHz)85 - description: CMU_PERICn NOC clock (from CMU_TOP)86 - description: CMU_PERICn IP clock (from CMU_TOP)87 88 clock-names:89 items:90 - const: oscclk91 - const: noc92 - const: ip93 94 - if:95 properties:96 compatible:97 enum:98 - samsung,exynosautov920-cmu-misc99 - samsung,exynosautov920-cmu-hsi0100 101 then:102 properties:103 clocks:104 items:105 - description: External reference clock (38.4 MHz)106 - description: CMU_MISC/CMU_HSI0 NOC clock (from CMU_TOP)107 108 clock-names:109 items:110 - const: oscclk111 - const: noc112 113 - if:114 properties:115 compatible:116 contains:117 const: samsung,exynosautov920-cmu-hsi1118 119 then:120 properties:121 clocks:122 items:123 - description: External reference clock (38.4 MHz)124 - description: CMU_HSI1 NOC clock (from CMU_TOP)125 - description: CMU_HSI1 USBDRD clock (from CMU_TOP)126 - description: CMU_HSI1 MMC_CARD clock (from CMU_TOP)127 128 clock-names:129 items:130 - const: oscclk131 - const: noc132 - const: usbdrd133 - const: mmc_card134 135required:136 - compatible137 - "#clock-cells"138 - clocks139 - clock-names140 - reg141 142additionalProperties: false143 144examples:145 # Clock controller node for CMU_PERIC0146 - |147 #include <dt-bindings/clock/samsung,exynosautov920.h>148 149 cmu_peric0: clock-controller@10800000 {150 compatible = "samsung,exynosautov920-cmu-peric0";151 reg = <0x10800000 0x8000>;152 #clock-cells = <1>;153 154 clocks = <&xtcxo>,155 <&cmu_top DOUT_CLKCMU_PERIC0_NOC>,156 <&cmu_top DOUT_CLKCMU_PERIC0_IP>;157 clock-names = "oscclk",158 "noc",159 "ip";160 };161 162...163