projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 8d21f244 GU |
1 | Generic Serial DT Bindings |
| 2 | ||
| 3 | This document lists a set of generic properties for describing UARTs in a | |
| 4 | device tree. Whether these properties apply to a particular device depends on | |
| 5 | the DT bindings for the actual device. | |
| 6 | ||
| 7 | Optional properties: | |
| 8 | - cts-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be | |
| 9 | used as the UART's CTS line. | |
| 10 | - dcd-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be | |
| 11 | used as the UART's DCD line. | |
| 12 | - dsr-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be | |
| 13 | used as the UART's DSR line. | |
| 14 | - dtr-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be | |
| 15 | used as the UART's DTR line. | |
| 16 | - rng-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be | |
| 17 | used as the UART's RNG line. | |
| 18 | - rts-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be | |
| 19 | used as the UART's RTS line. | |
| 20 | ||
| 21 | - uart-has-rtscts: The presence of this property indicates that the | |
| 22 | UART has dedicated lines for RTS/CTS hardware flow control, and that | |
| 23 | they are available for use (wired and enabled by pinmux configuration). | |
| 24 | This depends on both the UART hardware and the board wiring. | |
| 25 | Note that this property is mutually-exclusive with "cts-gpios" and | |
| 26 | "rts-gpios" above. | |
| 27 | ||
| 28 | ||
| 29 | Examples: | |
| 30 | ||
| 31 | uart1: serial@48022000 { | |
| 32 | compatible = "ti,am3352-uart", "ti,omap3-uart"; | |
| 33 | ti,hwmods = "uart2"; | |
| 34 | clock-frequency = <48000000>; | |
| 35 | reg = <0x48022000 0x2000>; | |
| 36 | interrupts = <73>; | |
| 37 | dmas = <&edma 28 0>, <&edma 29 0>; | |
| 38 | dma-names = "tx", "rx"; | |
| 39 | dtr-gpios = <&gpio2 22 GPIO_ACTIVE_LOW>; | |
| 40 | dsr-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>; | |
| 41 | dcd-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>; | |
| 42 | rng-gpios = <&gpio2 25 GPIO_ACTIVE_LOW>; | |
| 43 | cts-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>; | |
| 44 | rts-gpios = <&gpio0 13 GPIO_ACTIVE_LOW>; | |
| 45 | status = "okay"; | |
| 46 | }; | |
| 47 | ||
| 48 | scifa4: serial@e6c80000 { | |
| 49 | compatible = "renesas,scifa-sh73a0", "renesas,scifa"; | |
| 50 | reg = <0xe6c80000 0x100>; | |
| 51 | interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>; | |
| 52 | clocks = <&mstp2_clks SH73A0_CLK_SCIFA4>; | |
| 53 | clock-names = "fck"; | |
| 54 | power-domains = <&pd_a3sp>; | |
| 55 | uart-has-rtscts; | |
| 56 | status = "okay"; | |
| 57 | }; |