nvidia,tegra124-car.yaml (2773B)
1# SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/clock/nvidia,tegra124-car.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: NVIDIA Tegra Clock and Reset Controller 8 9maintainers: 10 - Jon Hunter <jonathanh@nvidia.com> 11 - Thierry Reding <thierry.reding@gmail.com> 12 13description: | 14 The Clock and Reset (CAR) is the HW module responsible for muxing and gating 15 Tegra's clocks, and setting their rates. It comprises CLKGEN and RSTGEN units. 16 17 CLKGEN provides the registers to program the PLLs. It controls most of 18 the clock source programming and most of the clock dividers. 19 20 CLKGEN input signals include the external clock for the reference frequency 21 (12 MHz, 26 MHz) and the external clock for the Real Time Clock (32.768 KHz). 22 23 Outputs from CLKGEN are inputs clock of the h/w blocks in the Tegra system. 24 25 RSTGEN provides the registers needed to control resetting of each block in 26 the Tegra system. 27 28properties: 29 compatible: 30 const: nvidia,tegra124-car 31 32 reg: 33 maxItems: 1 34 35 '#clock-cells': 36 const: 1 37 38 "#reset-cells": 39 const: 1 40 41 nvidia,external-memory-controller: 42 $ref: /schemas/types.yaml#/definitions/phandle 43 description: 44 phandle of the external memory controller node 45 46patternProperties: 47 "^emc-timings-[0-9]+$": 48 type: object 49 properties: 50 nvidia,ram-code: 51 $ref: /schemas/types.yaml#/definitions/uint32 52 description: 53 value of the RAM_CODE field in the PMC_STRAPPING_OPT_A register that 54 this timing set is used for 55 56 patternProperties: 57 "^timing-[0-9]+$": 58 type: object 59 properties: 60 clock-frequency: 61 description: 62 external memory clock rate in Hz 63 minimum: 1000000 64 maximum: 1000000000 65 66 nvidia,parent-clock-frequency: 67 $ref: /schemas/types.yaml#/definitions/uint32 68 description: 69 rate of parent clock in Hz 70 minimum: 1000000 71 maximum: 1000000000 72 73 clocks: 74 items: 75 - description: parent clock of EMC 76 77 clock-names: 78 items: 79 - const: emc-parent 80 81 required: 82 - clock-frequency 83 - nvidia,parent-clock-frequency 84 - clocks 85 - clock-names 86 87 additionalProperties: false 88 89 additionalProperties: false 90 91required: 92 - compatible 93 - reg 94 - '#clock-cells' 95 - "#reset-cells" 96 97additionalProperties: false 98 99examples: 100 - | 101 #include <dt-bindings/clock/tegra124-car.h> 102 103 car: clock-controller@60006000 { 104 compatible = "nvidia,tegra124-car"; 105 reg = <0x60006000 0x1000>; 106 #clock-cells = <1>; 107 #reset-cells = <1>; 108 };