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Diffstat (limited to 'Documentation/devicetree/bindings/serial/pl011.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/serial/pl011.txt | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/serial/pl011.txt b/Documentation/devicetree/bindings/serial/pl011.txt index 5d2e840ae65c..ba3ecb8cb5a1 100644 --- a/Documentation/devicetree/bindings/serial/pl011.txt +++ b/Documentation/devicetree/bindings/serial/pl011.txt @@ -6,12 +6,46 @@ Required properties: - interrupts: exactly one interrupt specifier Optional properties: -- pinctrl: When present, must have one state named "sleep" - and one state named "default" -- clocks: When present, must refer to exactly one clock named +- 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. +- 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"; +}; |