1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/display/tegra/nvidia,tegra124-dpaux.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: NVIDIA Tegra DisplayPort AUX Interface 8 9maintainers: 10 - Thierry Reding <thierry.reding@gmail.com> 11 - Jon Hunter <jonathanh@nvidia.com> 12 13description: | 14 The Tegra Display Port Auxiliary (DPAUX) pad controller manages two 15 pins which can be assigned to either the DPAUX channel or to an I2C 16 controller. 17 18 When configured for DisplayPort AUX operation, the DPAUX controller 19 can also be used to communicate with a DisplayPort device using the 20 AUX channel. 21 22properties: 23 $nodename: 24 pattern: "^dpaux@[0-9a-f]+$" 25 26 compatible: 27 oneOf: 28 - enum: 29 - nvidia,tegra124-dpaux 30 - nvidia,tegra210-dpaux 31 - nvidia,tegra186-dpaux 32 - nvidia,tegra194-dpaux 33 34 - items: 35 - const: nvidia,tegra132-dpaux 36 - const: nvidia,tegra124-dpaux 37 38 reg: 39 maxItems: 1 40 41 interrupts: 42 maxItems: 1 43 44 clocks: 45 items: 46 - description: clock input for the DPAUX hardware 47 - description: reference clock 48 49 clock-names: 50 items: 51 - const: dpaux 52 - const: parent 53 54 resets: 55 items: 56 - description: module reset 57 58 reset-names: 59 items: 60 - const: dpaux 61 62 power-domains: 63 maxItems: 1 64 65 i2c-bus: 66 description: Subnode where I2C slave devices are listed. This 67 subnode must be always present. If there are no I2C slave 68 devices, an empty node should be added. See ../../i2c/i2c.yaml 69 for more information. 70 type: object 71 72 aux-bus: 73 $ref: /schemas/display/dp-aux-bus.yaml# 74 75 vdd-supply: 76 description: phandle of a supply that powers the DisplayPort 77 link 78 79patternProperties: 80 "^pinmux-[a-z0-9]+$": 81 description: 82 Since only three configurations are possible, only three child 83 nodes are needed to describe the pin mux'ing options for the 84 DPAUX pads. Furthermore, given that the pad functions are only 85 applicable to a single set of pads, the child nodes only need 86 to describe the pad group the functions are being applied to 87 rather than the individual pads. 88 type: object 89 properties: 90 groups: 91 const: dpaux-io 92 93 function: 94 enum: 95 - aux 96 - i2c 97 - off 98 99 additionalProperties: false 100 101 required: 102 - groups 103 - function 104 105additionalProperties: false 106 107required: 108 - compatible 109 - reg 110 - interrupts 111 - clocks 112 - clock-names 113 - resets 114 - reset-names 115 116examples: 117 - | 118 #include <dt-bindings/clock/tegra210-car.h> 119 #include <dt-bindings/interrupt-controller/arm-gic.h> 120 121 dpaux: dpaux@545c0000 { 122 compatible = "nvidia,tegra210-dpaux"; 123 reg = <0x545c0000 0x00040000>; 124 interrupts = <GIC_SPI 159 IRQ_TYPE_LEVEL_HIGH>; 125 clocks = <&tegra_car TEGRA210_CLK_DPAUX>, 126 <&tegra_car TEGRA210_CLK_PLL_DP>; 127 clock-names = "dpaux", "parent"; 128 resets = <&tegra_car 181>; 129 reset-names = "dpaux"; 130 power-domains = <&pd_sor>; 131 status = "disabled"; 132 133 state_dpaux_aux: pinmux-aux { 134 groups = "dpaux-io"; 135 function = "aux"; 136 }; 137 138 state_dpaux_i2c: pinmux-i2c { 139 groups = "dpaux-io"; 140 function = "i2c"; 141 }; 142 143 state_dpaux_off: pinmux-off { 144 groups = "dpaux-io"; 145 function = "off"; 146 }; 147 148 i2c-bus { 149 #address-cells = <1>; 150 #size-cells = <0>; 151 }; 152 }; 153