1e69f5dc6SLubomir Rintel# Copyright 2020 Lubomir Rintel <lkundrak@v3.sk> 2e69f5dc6SLubomir Rintel%YAML 1.2 3e69f5dc6SLubomir Rintel--- 4e69f5dc6SLubomir Rintel$id: http://devicetree.org/schemas/serial/8250.yaml# 5e69f5dc6SLubomir Rintel$schema: http://devicetree.org/meta-schemas/core.yaml# 6e69f5dc6SLubomir Rintel 7e69f5dc6SLubomir Rinteltitle: UART (Universal Asynchronous Receiver/Transmitter) bindings 8e69f5dc6SLubomir Rintel 9e69f5dc6SLubomir Rintelmaintainers: 10e69f5dc6SLubomir Rintel - devicetree@vger.kernel.org 11e69f5dc6SLubomir Rintel 12e69f5dc6SLubomir RintelallOf: 13e69f5dc6SLubomir Rintel - $ref: /schemas/serial.yaml# 14e69f5dc6SLubomir Rintel - if: 15*845766b6SZev Weiss anyOf: 16*845766b6SZev Weiss - required: 17*845766b6SZev Weiss - aspeed,lpc-io-reg 18*845766b6SZev Weiss - required: 19*845766b6SZev Weiss - aspeed,lpc-interrupts 20*845766b6SZev Weiss - required: 21e69f5dc6SLubomir Rintel - aspeed,sirq-polarity-sense 22e69f5dc6SLubomir Rintel then: 23e69f5dc6SLubomir Rintel properties: 24e69f5dc6SLubomir Rintel compatible: 25e69f5dc6SLubomir Rintel const: aspeed,ast2500-vuart 26e69f5dc6SLubomir Rintel - if: 27e69f5dc6SLubomir Rintel properties: 28e69f5dc6SLubomir Rintel compatible: 29e69f5dc6SLubomir Rintel const: mrvl,mmp-uart 30e69f5dc6SLubomir Rintel then: 31e69f5dc6SLubomir Rintel properties: 32e69f5dc6SLubomir Rintel reg-shift: 33e69f5dc6SLubomir Rintel const: 2 34e69f5dc6SLubomir Rintel required: 35e69f5dc6SLubomir Rintel - reg-shift 36e69f5dc6SLubomir Rintel - if: 37e69f5dc6SLubomir Rintel not: 38e69f5dc6SLubomir Rintel properties: 39e69f5dc6SLubomir Rintel compatible: 40e69f5dc6SLubomir Rintel items: 41e69f5dc6SLubomir Rintel - enum: 42e69f5dc6SLubomir Rintel - ns8250 43e69f5dc6SLubomir Rintel - ns16450 44e69f5dc6SLubomir Rintel - ns16550 45e69f5dc6SLubomir Rintel - ns16550a 46e69f5dc6SLubomir Rintel then: 47e69f5dc6SLubomir Rintel anyOf: 48e69f5dc6SLubomir Rintel - required: [ clock-frequency ] 49e69f5dc6SLubomir Rintel - required: [ clocks ] 50e69f5dc6SLubomir Rintel 51e69f5dc6SLubomir Rintelproperties: 52e69f5dc6SLubomir Rintel compatible: 53e69f5dc6SLubomir Rintel oneOf: 54e69f5dc6SLubomir Rintel - const: ns8250 55e69f5dc6SLubomir Rintel - const: ns16450 56e69f5dc6SLubomir Rintel - const: ns16550 57e69f5dc6SLubomir Rintel - const: ns16550a 58e69f5dc6SLubomir Rintel - const: ns16850 59e69f5dc6SLubomir Rintel - const: aspeed,ast2400-vuart 60e69f5dc6SLubomir Rintel - const: aspeed,ast2500-vuart 61e69f5dc6SLubomir Rintel - const: intel,xscale-uart 62e69f5dc6SLubomir Rintel - const: mrvl,pxa-uart 633ece873eSJonathan Neuschäfer - const: nuvoton,wpcm450-uart 64e69f5dc6SLubomir Rintel - const: nuvoton,npcm750-uart 65e69f5dc6SLubomir Rintel - const: nvidia,tegra20-uart 66e69f5dc6SLubomir Rintel - const: nxp,lpc3220-uart 67e69f5dc6SLubomir Rintel - items: 68e69f5dc6SLubomir Rintel - enum: 69e69f5dc6SLubomir Rintel - altr,16550-FIFO32 70e69f5dc6SLubomir Rintel - altr,16550-FIFO64 71e69f5dc6SLubomir Rintel - altr,16550-FIFO128 72e69f5dc6SLubomir Rintel - fsl,16550-FIFO64 73e69f5dc6SLubomir Rintel - fsl,ns16550 74e69f5dc6SLubomir Rintel - andestech,uart16550 75e69f5dc6SLubomir Rintel - nxp,lpc1850-uart 76e69f5dc6SLubomir Rintel - opencores,uart16550-rtlsvn105 77e69f5dc6SLubomir Rintel - ti,da830-uart 78e69f5dc6SLubomir Rintel - const: ns16550a 79e69f5dc6SLubomir Rintel - items: 80e69f5dc6SLubomir Rintel - enum: 81e69f5dc6SLubomir Rintel - ns16750 82e69f5dc6SLubomir Rintel - cavium,octeon-3860-uart 83e69f5dc6SLubomir Rintel - xlnx,xps-uart16550-2.00.b 84e69f5dc6SLubomir Rintel - ralink,rt2880-uart 85e69f5dc6SLubomir Rintel - enum: 86e69f5dc6SLubomir Rintel - ns16550 # Deprecated, unless the FIFO really is broken 87e69f5dc6SLubomir Rintel - ns16550a 88e69f5dc6SLubomir Rintel - items: 89e69f5dc6SLubomir Rintel - enum: 90e69f5dc6SLubomir Rintel - ralink,mt7620a-uart 91e69f5dc6SLubomir Rintel - ralink,rt3052-uart 92e69f5dc6SLubomir Rintel - ralink,rt3883-uart 93e69f5dc6SLubomir Rintel - const: ralink,rt2880-uart 94e69f5dc6SLubomir Rintel - enum: 95e69f5dc6SLubomir Rintel - ns16550 # Deprecated, unless the FIFO really is broken 96e69f5dc6SLubomir Rintel - ns16550a 97e69f5dc6SLubomir Rintel - items: 98e69f5dc6SLubomir Rintel - enum: 99e69f5dc6SLubomir Rintel - mediatek,mt7622-btif 100e69f5dc6SLubomir Rintel - mediatek,mt7623-btif 101e69f5dc6SLubomir Rintel - const: mediatek,mtk-btif 102e69f5dc6SLubomir Rintel - items: 103e69f5dc6SLubomir Rintel - enum: 104e69f5dc6SLubomir Rintel - mediatek,mt7622-btif 105e69f5dc6SLubomir Rintel - mediatek,mt7623-btif 106e69f5dc6SLubomir Rintel - const: mediatek,mtk-btif 107e69f5dc6SLubomir Rintel - items: 108e69f5dc6SLubomir Rintel - const: mrvl,mmp-uart 109e69f5dc6SLubomir Rintel - const: intel,xscale-uart 110e69f5dc6SLubomir Rintel - items: 111e69f5dc6SLubomir Rintel - enum: 112e69f5dc6SLubomir Rintel - nvidia,tegra30-uart 113e69f5dc6SLubomir Rintel - nvidia,tegra114-uart 114e69f5dc6SLubomir Rintel - nvidia,tegra124-uart 115e69f5dc6SLubomir Rintel - nvidia,tegra186-uart 116e69f5dc6SLubomir Rintel - nvidia,tegra194-uart 117e69f5dc6SLubomir Rintel - nvidia,tegra210-uart 118e69f5dc6SLubomir Rintel - const: nvidia,tegra20-uart 119e69f5dc6SLubomir Rintel 120e69f5dc6SLubomir Rintel reg: 121e69f5dc6SLubomir Rintel maxItems: 1 122e69f5dc6SLubomir Rintel 123e69f5dc6SLubomir Rintel interrupts: 124e69f5dc6SLubomir Rintel maxItems: 1 125e69f5dc6SLubomir Rintel 126e69f5dc6SLubomir Rintel clock-frequency: true 127e69f5dc6SLubomir Rintel 128e69f5dc6SLubomir Rintel clocks: 129e69f5dc6SLubomir Rintel maxItems: 1 130e69f5dc6SLubomir Rintel 131e69f5dc6SLubomir Rintel resets: 132e69f5dc6SLubomir Rintel maxItems: 1 133e69f5dc6SLubomir Rintel 134e69f5dc6SLubomir Rintel current-speed: 135d69c6dddSRob Herring $ref: /schemas/types.yaml#/definitions/uint32 136e69f5dc6SLubomir Rintel description: The current active speed of the UART. 137e69f5dc6SLubomir Rintel 138e69f5dc6SLubomir Rintel reg-offset: 139e69f5dc6SLubomir Rintel description: | 140e69f5dc6SLubomir Rintel Offset to apply to the mapbase from the start of the registers. 141e69f5dc6SLubomir Rintel 142e69f5dc6SLubomir Rintel reg-shift: 143e69f5dc6SLubomir Rintel description: Quantity to shift the register offsets by. 144e69f5dc6SLubomir Rintel 145e69f5dc6SLubomir Rintel reg-io-width: 146e69f5dc6SLubomir Rintel description: | 147e69f5dc6SLubomir Rintel The size (in bytes) of the IO accesses that should be performed on the 148e69f5dc6SLubomir Rintel device. There are some systems that require 32-bit accesses to the 149e69f5dc6SLubomir Rintel UART (e.g. TI davinci). 150e69f5dc6SLubomir Rintel 151e69f5dc6SLubomir Rintel used-by-rtas: 152e69f5dc6SLubomir Rintel type: boolean 153e69f5dc6SLubomir Rintel description: | 154e69f5dc6SLubomir Rintel Set to indicate that the port is in use by the OpenFirmware RTAS and 155e69f5dc6SLubomir Rintel should not be registered. 156e69f5dc6SLubomir Rintel 157e69f5dc6SLubomir Rintel no-loopback-test: 158e69f5dc6SLubomir Rintel type: boolean 159e69f5dc6SLubomir Rintel description: | 160e69f5dc6SLubomir Rintel Set to indicate that the port does not implement loopback test mode. 161e69f5dc6SLubomir Rintel 162e69f5dc6SLubomir Rintel fifo-size: 163d69c6dddSRob Herring $ref: /schemas/types.yaml#/definitions/uint32 164e69f5dc6SLubomir Rintel description: The fifo size of the UART. 165e69f5dc6SLubomir Rintel 166e69f5dc6SLubomir Rintel auto-flow-control: 167e69f5dc6SLubomir Rintel type: boolean 168e69f5dc6SLubomir Rintel description: | 169e69f5dc6SLubomir Rintel One way to enable automatic flow control support. The driver is 170e69f5dc6SLubomir Rintel allowed to detect support for the capability even without this 171e69f5dc6SLubomir Rintel property. 172e69f5dc6SLubomir Rintel 173e69f5dc6SLubomir Rintel tx-threshold: 174d69c6dddSRob Herring $ref: /schemas/types.yaml#/definitions/uint32 175e69f5dc6SLubomir Rintel description: | 176e69f5dc6SLubomir Rintel Specify the TX FIFO low water indication for parts with programmable 177e69f5dc6SLubomir Rintel TX FIFO thresholds. 178e69f5dc6SLubomir Rintel 179e69f5dc6SLubomir Rintel overrun-throttle-ms: 180e69f5dc6SLubomir Rintel description: | 181e69f5dc6SLubomir Rintel How long to pause uart rx when input overrun is encountered. 182e69f5dc6SLubomir Rintel 183e69f5dc6SLubomir Rintel rts-gpios: true 184e69f5dc6SLubomir Rintel cts-gpios: true 185e69f5dc6SLubomir Rintel dtr-gpios: true 186e69f5dc6SLubomir Rintel dsr-gpios: true 187e69f5dc6SLubomir Rintel rng-gpios: true 188e69f5dc6SLubomir Rintel dcd-gpios: true 189e69f5dc6SLubomir Rintel 190e69f5dc6SLubomir Rintel aspeed,sirq-polarity-sense: 191e69f5dc6SLubomir Rintel $ref: /schemas/types.yaml#/definitions/phandle-array 192e69f5dc6SLubomir Rintel description: | 193e69f5dc6SLubomir Rintel Phandle to aspeed,ast2500-scu compatible syscon alongside register 194e69f5dc6SLubomir Rintel offset and bit number to identify how the SIRQ polarity should be 195e69f5dc6SLubomir Rintel configured. One possible data source is the LPC/eSPI mode bit. Only 196e69f5dc6SLubomir Rintel applicable to aspeed,ast2500-vuart. 197a13df3beSZev Weiss deprecated: true 198e69f5dc6SLubomir Rintel 199*845766b6SZev Weiss aspeed,lpc-io-reg: 200*845766b6SZev Weiss $ref: '/schemas/types.yaml#/definitions/uint32' 201*845766b6SZev Weiss description: | 202*845766b6SZev Weiss The VUART LPC address. Only applicable to aspeed,ast2500-vuart. 203*845766b6SZev Weiss 204*845766b6SZev Weiss aspeed,lpc-interrupts: 205*845766b6SZev Weiss $ref: "/schemas/types.yaml#/definitions/uint32-array" 206*845766b6SZev Weiss minItems: 2 207*845766b6SZev Weiss maxItems: 2 208*845766b6SZev Weiss description: | 209*845766b6SZev Weiss A 2-cell property describing the VUART SIRQ number and SIRQ 210*845766b6SZev Weiss polarity (IRQ_TYPE_LEVEL_LOW or IRQ_TYPE_LEVEL_HIGH). Only 211*845766b6SZev Weiss applicable to aspeed,ast2500-vuart. 212*845766b6SZev Weiss 213e69f5dc6SLubomir Rintelrequired: 214e69f5dc6SLubomir Rintel - reg 215e69f5dc6SLubomir Rintel - interrupts 216e69f5dc6SLubomir Rintel 217e69f5dc6SLubomir RintelunevaluatedProperties: false 218e69f5dc6SLubomir Rintel 219e69f5dc6SLubomir Rintelexamples: 220e69f5dc6SLubomir Rintel - | 221e69f5dc6SLubomir Rintel serial@80230000 { 222e69f5dc6SLubomir Rintel compatible = "ns8250"; 223e69f5dc6SLubomir Rintel reg = <0x80230000 0x100>; 224e69f5dc6SLubomir Rintel interrupts = <10>; 225e69f5dc6SLubomir Rintel reg-shift = <2>; 226e69f5dc6SLubomir Rintel clock-frequency = <48000000>; 227e69f5dc6SLubomir Rintel }; 228e69f5dc6SLubomir Rintel - | 229e69f5dc6SLubomir Rintel #include <dt-bindings/gpio/gpio.h> 230e69f5dc6SLubomir Rintel serial@49042000 { 231e69f5dc6SLubomir Rintel compatible = "andestech,uart16550", "ns16550a"; 232e69f5dc6SLubomir Rintel reg = <0x49042000 0x400>; 233e69f5dc6SLubomir Rintel interrupts = <80>; 234e69f5dc6SLubomir Rintel clock-frequency = <48000000>; 235e69f5dc6SLubomir Rintel cts-gpios = <&gpio3 5 GPIO_ACTIVE_LOW>; 236e69f5dc6SLubomir Rintel rts-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>; 237e69f5dc6SLubomir Rintel dtr-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>; 238e69f5dc6SLubomir Rintel dsr-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>; 239e69f5dc6SLubomir Rintel dcd-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>; 240e69f5dc6SLubomir Rintel rng-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>; 241e69f5dc6SLubomir Rintel }; 242e69f5dc6SLubomir Rintel - | 243e69f5dc6SLubomir Rintel #include <dt-bindings/clock/aspeed-clock.h> 244*845766b6SZev Weiss #include <dt-bindings/interrupt-controller/irq.h> 245e69f5dc6SLubomir Rintel serial@1e787000 { 246e69f5dc6SLubomir Rintel compatible = "aspeed,ast2500-vuart"; 247e69f5dc6SLubomir Rintel reg = <0x1e787000 0x40>; 248e69f5dc6SLubomir Rintel reg-shift = <2>; 249e69f5dc6SLubomir Rintel interrupts = <8>; 250e69f5dc6SLubomir Rintel clocks = <&syscon ASPEED_CLK_APB>; 251e69f5dc6SLubomir Rintel no-loopback-test; 252*845766b6SZev Weiss aspeed,lpc-io-reg = <0x3f8>; 253*845766b6SZev Weiss aspeed,lpc-interrupts = <4 IRQ_TYPE_LEVEL_LOW>; 254e69f5dc6SLubomir Rintel }; 255e69f5dc6SLubomir Rintel 256e69f5dc6SLubomir Rintel... 257