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: 138f082dcfSZhen Lei - $ref: serial.yaml# 14e69f5dc6SLubomir Rintel - if: 15845766b6SZev Weiss anyOf: 16845766b6SZev Weiss - required: 17845766b6SZev Weiss - aspeed,lpc-io-reg 18845766b6SZev Weiss - required: 19845766b6SZev Weiss - aspeed,lpc-interrupts 20845766b6SZev 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: 69f444f34bSLinus Walleij - exar,xr16l2552 70f444f34bSLinus Walleij - exar,xr16l2551 71f444f34bSLinus Walleij - exar,xr16l2550 72f444f34bSLinus Walleij - const: ns8250 73f444f34bSLinus Walleij - items: 74f444f34bSLinus Walleij - enum: 75e69f5dc6SLubomir Rintel - altr,16550-FIFO32 76e69f5dc6SLubomir Rintel - altr,16550-FIFO64 77e69f5dc6SLubomir Rintel - altr,16550-FIFO128 78e69f5dc6SLubomir Rintel - fsl,16550-FIFO64 79e69f5dc6SLubomir Rintel - fsl,ns16550 80e69f5dc6SLubomir Rintel - andestech,uart16550 81e69f5dc6SLubomir Rintel - nxp,lpc1850-uart 82e69f5dc6SLubomir Rintel - opencores,uart16550-rtlsvn105 83e69f5dc6SLubomir Rintel - ti,da830-uart 84e69f5dc6SLubomir Rintel - const: ns16550a 85e69f5dc6SLubomir Rintel - items: 86e69f5dc6SLubomir Rintel - enum: 87e69f5dc6SLubomir Rintel - ns16750 88e69f5dc6SLubomir Rintel - cavium,octeon-3860-uart 89e69f5dc6SLubomir Rintel - xlnx,xps-uart16550-2.00.b 90e69f5dc6SLubomir Rintel - ralink,rt2880-uart 91e69f5dc6SLubomir Rintel - enum: 92e69f5dc6SLubomir Rintel - ns16550 # Deprecated, unless the FIFO really is broken 93e69f5dc6SLubomir Rintel - ns16550a 94e69f5dc6SLubomir Rintel - items: 95e69f5dc6SLubomir Rintel - enum: 96e69f5dc6SLubomir Rintel - ralink,mt7620a-uart 97e69f5dc6SLubomir Rintel - ralink,rt3052-uart 98e69f5dc6SLubomir Rintel - ralink,rt3883-uart 99e69f5dc6SLubomir Rintel - const: ralink,rt2880-uart 100e69f5dc6SLubomir Rintel - enum: 101e69f5dc6SLubomir Rintel - ns16550 # Deprecated, unless the FIFO really is broken 102e69f5dc6SLubomir Rintel - ns16550a 103e69f5dc6SLubomir Rintel - items: 104e69f5dc6SLubomir Rintel - enum: 105e69f5dc6SLubomir Rintel - mediatek,mt7622-btif 106e69f5dc6SLubomir Rintel - mediatek,mt7623-btif 107e69f5dc6SLubomir Rintel - const: mediatek,mtk-btif 108e69f5dc6SLubomir Rintel - items: 109e69f5dc6SLubomir Rintel - const: mrvl,mmp-uart 110e69f5dc6SLubomir Rintel - const: intel,xscale-uart 111e69f5dc6SLubomir Rintel - items: 112e69f5dc6SLubomir Rintel - enum: 113e69f5dc6SLubomir Rintel - nvidia,tegra30-uart 114e69f5dc6SLubomir Rintel - nvidia,tegra114-uart 115e69f5dc6SLubomir Rintel - nvidia,tegra124-uart 116*96b594d2SThierry Reding - nvidia,tegra210-uart 117e69f5dc6SLubomir Rintel - nvidia,tegra186-uart 118e69f5dc6SLubomir Rintel - nvidia,tegra194-uart 119*96b594d2SThierry Reding - nvidia,tegra234-uart 120e69f5dc6SLubomir Rintel - const: nvidia,tegra20-uart 121e69f5dc6SLubomir Rintel 122e69f5dc6SLubomir Rintel reg: 123e69f5dc6SLubomir Rintel maxItems: 1 124e69f5dc6SLubomir Rintel 125e69f5dc6SLubomir Rintel interrupts: 126e69f5dc6SLubomir Rintel maxItems: 1 127e69f5dc6SLubomir Rintel 128e69f5dc6SLubomir Rintel clock-frequency: true 129e69f5dc6SLubomir Rintel 130e69f5dc6SLubomir Rintel clocks: 131e69f5dc6SLubomir Rintel maxItems: 1 132e69f5dc6SLubomir Rintel 133e69f5dc6SLubomir Rintel resets: 134e69f5dc6SLubomir Rintel maxItems: 1 135e69f5dc6SLubomir Rintel 136e69f5dc6SLubomir Rintel current-speed: 137d69c6dddSRob Herring $ref: /schemas/types.yaml#/definitions/uint32 138e69f5dc6SLubomir Rintel description: The current active speed of the UART. 139e69f5dc6SLubomir Rintel 140e69f5dc6SLubomir Rintel reg-offset: 141e69f5dc6SLubomir Rintel description: | 142e69f5dc6SLubomir Rintel Offset to apply to the mapbase from the start of the registers. 143e69f5dc6SLubomir Rintel 144e69f5dc6SLubomir Rintel reg-shift: 145e69f5dc6SLubomir Rintel description: Quantity to shift the register offsets by. 146e69f5dc6SLubomir Rintel 147e69f5dc6SLubomir Rintel reg-io-width: 148e69f5dc6SLubomir Rintel description: | 149e69f5dc6SLubomir Rintel The size (in bytes) of the IO accesses that should be performed on the 150e69f5dc6SLubomir Rintel device. There are some systems that require 32-bit accesses to the 151e69f5dc6SLubomir Rintel UART (e.g. TI davinci). 152e69f5dc6SLubomir Rintel 153e69f5dc6SLubomir Rintel used-by-rtas: 154e69f5dc6SLubomir Rintel type: boolean 155e69f5dc6SLubomir Rintel description: | 156e69f5dc6SLubomir Rintel Set to indicate that the port is in use by the OpenFirmware RTAS and 157e69f5dc6SLubomir Rintel should not be registered. 158e69f5dc6SLubomir Rintel 159e69f5dc6SLubomir Rintel no-loopback-test: 160e69f5dc6SLubomir Rintel type: boolean 161e69f5dc6SLubomir Rintel description: | 162e69f5dc6SLubomir Rintel Set to indicate that the port does not implement loopback test mode. 163e69f5dc6SLubomir Rintel 164e69f5dc6SLubomir Rintel fifo-size: 165d69c6dddSRob Herring $ref: /schemas/types.yaml#/definitions/uint32 166e69f5dc6SLubomir Rintel description: The fifo size of the UART. 167e69f5dc6SLubomir Rintel 168e69f5dc6SLubomir Rintel auto-flow-control: 169e69f5dc6SLubomir Rintel type: boolean 170e69f5dc6SLubomir Rintel description: | 171e69f5dc6SLubomir Rintel One way to enable automatic flow control support. The driver is 172e69f5dc6SLubomir Rintel allowed to detect support for the capability even without this 173e69f5dc6SLubomir Rintel property. 174e69f5dc6SLubomir Rintel 175e69f5dc6SLubomir Rintel tx-threshold: 176e69f5dc6SLubomir Rintel description: | 177e69f5dc6SLubomir Rintel Specify the TX FIFO low water indication for parts with programmable 178e69f5dc6SLubomir Rintel TX FIFO thresholds. 179e69f5dc6SLubomir Rintel 180e69f5dc6SLubomir Rintel overrun-throttle-ms: 181e69f5dc6SLubomir Rintel description: | 182e69f5dc6SLubomir Rintel How long to pause uart rx when input overrun is encountered. 183e69f5dc6SLubomir Rintel 184e69f5dc6SLubomir Rintel rts-gpios: true 185e69f5dc6SLubomir Rintel cts-gpios: true 186e69f5dc6SLubomir Rintel dtr-gpios: true 187e69f5dc6SLubomir Rintel dsr-gpios: true 188e69f5dc6SLubomir Rintel rng-gpios: true 189e69f5dc6SLubomir Rintel dcd-gpios: true 190e69f5dc6SLubomir Rintel 191e69f5dc6SLubomir Rintel aspeed,sirq-polarity-sense: 192e69f5dc6SLubomir Rintel $ref: /schemas/types.yaml#/definitions/phandle-array 193e69f5dc6SLubomir Rintel description: | 194e69f5dc6SLubomir Rintel Phandle to aspeed,ast2500-scu compatible syscon alongside register 195e69f5dc6SLubomir Rintel offset and bit number to identify how the SIRQ polarity should be 196e69f5dc6SLubomir Rintel configured. One possible data source is the LPC/eSPI mode bit. Only 197e69f5dc6SLubomir Rintel applicable to aspeed,ast2500-vuart. 198a13df3beSZev Weiss deprecated: true 199e69f5dc6SLubomir Rintel 200845766b6SZev Weiss aspeed,lpc-io-reg: 201845766b6SZev Weiss $ref: '/schemas/types.yaml#/definitions/uint32' 202845766b6SZev Weiss description: | 203845766b6SZev Weiss The VUART LPC address. Only applicable to aspeed,ast2500-vuart. 204845766b6SZev Weiss 205845766b6SZev Weiss aspeed,lpc-interrupts: 206845766b6SZev Weiss $ref: "/schemas/types.yaml#/definitions/uint32-array" 207845766b6SZev Weiss minItems: 2 208845766b6SZev Weiss maxItems: 2 209845766b6SZev Weiss description: | 210845766b6SZev Weiss A 2-cell property describing the VUART SIRQ number and SIRQ 211845766b6SZev Weiss polarity (IRQ_TYPE_LEVEL_LOW or IRQ_TYPE_LEVEL_HIGH). Only 212845766b6SZev Weiss applicable to aspeed,ast2500-vuart. 213845766b6SZev Weiss 214e69f5dc6SLubomir Rintelrequired: 215e69f5dc6SLubomir Rintel - reg 216e69f5dc6SLubomir Rintel - interrupts 217e69f5dc6SLubomir Rintel 218e69f5dc6SLubomir RintelunevaluatedProperties: false 219e69f5dc6SLubomir Rintel 220e69f5dc6SLubomir Rintelexamples: 221e69f5dc6SLubomir Rintel - | 222e69f5dc6SLubomir Rintel serial@80230000 { 223e69f5dc6SLubomir Rintel compatible = "ns8250"; 224e69f5dc6SLubomir Rintel reg = <0x80230000 0x100>; 225e69f5dc6SLubomir Rintel interrupts = <10>; 226e69f5dc6SLubomir Rintel reg-shift = <2>; 227e69f5dc6SLubomir Rintel clock-frequency = <48000000>; 228e69f5dc6SLubomir Rintel }; 229e69f5dc6SLubomir Rintel - | 230e69f5dc6SLubomir Rintel #include <dt-bindings/gpio/gpio.h> 231e69f5dc6SLubomir Rintel serial@49042000 { 232e69f5dc6SLubomir Rintel compatible = "andestech,uart16550", "ns16550a"; 233e69f5dc6SLubomir Rintel reg = <0x49042000 0x400>; 234e69f5dc6SLubomir Rintel interrupts = <80>; 235e69f5dc6SLubomir Rintel clock-frequency = <48000000>; 236e69f5dc6SLubomir Rintel cts-gpios = <&gpio3 5 GPIO_ACTIVE_LOW>; 237e69f5dc6SLubomir Rintel rts-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>; 238e69f5dc6SLubomir Rintel dtr-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>; 239e69f5dc6SLubomir Rintel dsr-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>; 240e69f5dc6SLubomir Rintel dcd-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>; 241e69f5dc6SLubomir Rintel rng-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>; 242e69f5dc6SLubomir Rintel }; 243e69f5dc6SLubomir Rintel - | 244e69f5dc6SLubomir Rintel #include <dt-bindings/clock/aspeed-clock.h> 245845766b6SZev Weiss #include <dt-bindings/interrupt-controller/irq.h> 246e69f5dc6SLubomir Rintel serial@1e787000 { 247e69f5dc6SLubomir Rintel compatible = "aspeed,ast2500-vuart"; 248e69f5dc6SLubomir Rintel reg = <0x1e787000 0x40>; 249e69f5dc6SLubomir Rintel reg-shift = <2>; 250e69f5dc6SLubomir Rintel interrupts = <8>; 251e69f5dc6SLubomir Rintel clocks = <&syscon ASPEED_CLK_APB>; 252e69f5dc6SLubomir Rintel no-loopback-test; 253845766b6SZev Weiss aspeed,lpc-io-reg = <0x3f8>; 254845766b6SZev Weiss aspeed,lpc-interrupts = <4 IRQ_TYPE_LEVEL_LOW>; 255e69f5dc6SLubomir Rintel }; 256e69f5dc6SLubomir Rintel 257e69f5dc6SLubomir Rintel... 258