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