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Diffstat (limited to 'Documentation/devicetree/bindings/serial/8250.yaml')
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1 files changed, 264 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml new file mode 100644 index 000000000000..692aa05500fd --- /dev/null +++ b/Documentation/devicetree/bindings/serial/8250.yaml @@ -0,0 +1,264 @@ +# Copyright 2020 Lubomir Rintel <lkundrak@v3.sk> +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/serial/8250.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: UART (Universal Asynchronous Receiver/Transmitter) + +maintainers: + - devicetree@vger.kernel.org + +allOf: + - $ref: serial.yaml# + - $ref: /schemas/memory-controllers/mc-peripheral-props.yaml# + - if: + anyOf: + - required: + - aspeed,lpc-io-reg + - required: + - aspeed,lpc-interrupts + - required: + - aspeed,sirq-polarity-sense + then: + properties: + compatible: + const: aspeed,ast2500-vuart + - if: + properties: + compatible: + const: mrvl,mmp-uart + then: + properties: + reg-shift: + const: 2 + required: + - reg-shift + - if: + not: + properties: + compatible: + items: + - enum: + - ns8250 + - ns16450 + - ns16550 + - ns16550a + then: + anyOf: + - required: [ clock-frequency ] + - required: [ clocks ] + +properties: + compatible: + oneOf: + - const: ns8250 + - const: ns16450 + - const: ns16550 + - const: ns16550a + - const: ns16850 + - const: aspeed,ast2400-vuart + - const: aspeed,ast2500-vuart + - const: intel,xscale-uart + - const: mrvl,pxa-uart + - const: nuvoton,wpcm450-uart + - const: nuvoton,npcm750-uart + - const: nvidia,tegra20-uart + - const: nxp,lpc3220-uart + - items: + - enum: + - exar,xr16l2552 + - exar,xr16l2551 + - exar,xr16l2550 + - const: ns8250 + - items: + - enum: + - altr,16550-FIFO32 + - altr,16550-FIFO64 + - altr,16550-FIFO128 + - fsl,16550-FIFO64 + - fsl,ns16550 + - andestech,uart16550 + - nxp,lpc1850-uart + - opencores,uart16550-rtlsvn105 + - ti,da830-uart + - const: ns16550a + - items: + - enum: + - ns16750 + - cavium,octeon-3860-uart + - xlnx,xps-uart16550-2.00.b + - ralink,rt2880-uart + - enum: + - ns16550 # Deprecated, unless the FIFO really is broken + - ns16550a + - items: + - enum: + - nuvoton,npcm845-uart + - const: nuvoton,npcm750-uart + - items: + - enum: + - ralink,mt7620a-uart + - ralink,rt3052-uart + - ralink,rt3883-uart + - const: ralink,rt2880-uart + - enum: + - ns16550 # Deprecated, unless the FIFO really is broken + - ns16550a + - items: + - enum: + - mediatek,mt7622-btif + - mediatek,mt7623-btif + - const: mediatek,mtk-btif + - items: + - const: mrvl,mmp-uart + - const: intel,xscale-uart + - items: + - enum: + - nvidia,tegra30-uart + - nvidia,tegra114-uart + - nvidia,tegra124-uart + - nvidia,tegra210-uart + - nvidia,tegra186-uart + - nvidia,tegra194-uart + - nvidia,tegra234-uart + - const: nvidia,tegra20-uart + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + clock-frequency: true + + clocks: + maxItems: 1 + + resets: + maxItems: 1 + + current-speed: + $ref: /schemas/types.yaml#/definitions/uint32 + description: The current active speed of the UART. + + reg-offset: + $ref: /schemas/types.yaml#/definitions/uint32 + description: | + Offset to apply to the mapbase from the start of the registers. + + reg-shift: + description: Quantity to shift the register offsets by. + + reg-io-width: + description: | + The size (in bytes) of the IO accesses that should be performed on the + device. There are some systems that require 32-bit accesses to the + UART (e.g. TI davinci). + + used-by-rtas: + type: boolean + description: | + Set to indicate that the port is in use by the OpenFirmware RTAS and + should not be registered. + + no-loopback-test: + type: boolean + description: | + Set to indicate that the port does not implement loopback test mode. + + fifo-size: + $ref: /schemas/types.yaml#/definitions/uint32 + description: The fifo size of the UART. + + auto-flow-control: + type: boolean + description: | + One way to enable automatic flow control support. The driver is + allowed to detect support for the capability even without this + property. + + tx-threshold: + description: | + Specify the TX FIFO low water indication for parts with programmable + TX FIFO thresholds. + + overrun-throttle-ms: + description: | + How long to pause uart rx when input overrun is encountered. + + rts-gpios: true + cts-gpios: true + dtr-gpios: true + dsr-gpios: true + rng-gpios: true + dcd-gpios: true + + aspeed,sirq-polarity-sense: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: | + Phandle to aspeed,ast2500-scu compatible syscon alongside register + offset and bit number to identify how the SIRQ polarity should be + configured. One possible data source is the LPC/eSPI mode bit. Only + applicable to aspeed,ast2500-vuart. + deprecated: true + + aspeed,lpc-io-reg: + $ref: /schemas/types.yaml#/definitions/uint32-array + maxItems: 1 + description: | + The VUART LPC address. Only applicable to aspeed,ast2500-vuart. + + aspeed,lpc-interrupts: + $ref: /schemas/types.yaml#/definitions/uint32-array + minItems: 2 + maxItems: 2 + description: | + A 2-cell property describing the VUART SIRQ number and SIRQ + polarity (IRQ_TYPE_LEVEL_LOW or IRQ_TYPE_LEVEL_HIGH). Only + applicable to aspeed,ast2500-vuart. + +required: + - reg + - interrupts + +unevaluatedProperties: false + +examples: + - | + serial@80230000 { + compatible = "ns8250"; + reg = <0x80230000 0x100>; + interrupts = <10>; + reg-shift = <2>; + clock-frequency = <48000000>; + }; + - | + #include <dt-bindings/gpio/gpio.h> + serial@49042000 { + compatible = "andestech,uart16550", "ns16550a"; + reg = <0x49042000 0x400>; + interrupts = <80>; + clock-frequency = <48000000>; + cts-gpios = <&gpio3 5 GPIO_ACTIVE_LOW>; + rts-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>; + dtr-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>; + dsr-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>; + dcd-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>; + rng-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>; + }; + - | + #include <dt-bindings/clock/aspeed-clock.h> + #include <dt-bindings/interrupt-controller/irq.h> + serial@1e787000 { + compatible = "aspeed,ast2500-vuart"; + reg = <0x1e787000 0x40>; + reg-shift = <2>; + interrupts = <8>; + clocks = <&syscon ASPEED_CLK_APB>; + no-loopback-test; + aspeed,lpc-io-reg = <0x3f8>; + aspeed,lpc-interrupts = <4 IRQ_TYPE_LEVEL_LOW>; + }; + +... |