52 lines
1.6 KiB
Plaintext
52 lines
1.6 KiB
Plaintext
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* ARM AMBA Primecell PL011 serial UART
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Required properties:
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- compatible: must be "arm,primecell", "arm,pl011", "zte,zx296702-uart"
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- reg: exactly one register range with length 0x1000
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- interrupts: exactly one interrupt specifier
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Optional properties:
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- pinctrl:
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When present, must have one state named "default",
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and may contain a second name named "sleep". The former
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state sets up pins for ordinary operation whereas
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the latter state will put the associated pins to sleep
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when the UART is unused
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- clocks:
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When present, the first clock listed must correspond to
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the clock named UARTCLK on the IP block, i.e. the clock
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to the external serial line, whereas the second clock
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must correspond to the PCLK clocking the internal logic
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of the block. Just listing one clock (the first one) is
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deprecated.
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- clock-names:
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When present, the first clock listed must be named
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"uartclk" and the second clock listed must be named
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"apb_pclk"
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- dmas:
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When present, may have one or two dma channels.
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The first one must be named "rx", the second one
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must be named "tx".
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- auto-poll:
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Enables polling when using RX DMA.
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- poll-rate-ms:
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Rate at which poll occurs when auto-poll is set,
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default 100ms.
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- poll-timeout-ms:
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Poll timeout when auto-poll is set, default
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3000ms.
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See also bindings/arm/primecell.txt
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Example:
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uart@80120000 {
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compatible = "arm,pl011", "arm,primecell";
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reg = <0x80120000 0x1000>;
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interrupts = <0 11 IRQ_TYPE_LEVEL_HIGH>;
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dmas = <&dma 13 0 0x2>, <&dma 13 0 0x0>;
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dma-names = "rx", "tx";
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clocks = <&foo_clk>, <&bar_clk>;
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clock-names = "uartclk", "apb_pclk";
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};
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