Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / serial / pl011.txt

diff --git a/kernel/Documentation/devicetree/bindings/serial/pl011.txt b/kernel/Documentation/devicetree/bindings/serial/pl011.txt
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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";
+};