From 646d1a09f05689a3a4781112a3b3e4747d0ba231 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 7 Nov 2018 09:48:28 +0100 Subject: dts: update to v4.20-rc1 Signed-off-by: Sascha Hauer --- dts/Bindings/mfd/atmel-usart.txt | 85 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 dts/Bindings/mfd/atmel-usart.txt (limited to 'dts/Bindings/mfd/atmel-usart.txt') diff --git a/dts/Bindings/mfd/atmel-usart.txt b/dts/Bindings/mfd/atmel-usart.txt new file mode 100644 index 0000000000..7f0cd72f47 --- /dev/null +++ b/dts/Bindings/mfd/atmel-usart.txt @@ -0,0 +1,85 @@ +* Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART) + +Required properties for USART: +- compatible: Should be "atmel,-usart" or "atmel,-dbgu" + The compatible indicated will be the first SoC to support an + additional mode or an USART new feature. + For the dbgu UART, use "atmel,-dbgu", "atmel,-usart" +- reg: Should contain registers location and length +- interrupts: Should contain interrupt +- clock-names: tuple listing input clock names. + Required elements: "usart" +- clocks: phandles to input clocks. + +Required properties for USART in SPI mode: +- #size-cells : Must be <0> +- #address-cells : Must be <1> +- cs-gpios: chipselects (internal cs not supported) +- atmel,usart-mode : Must be (found in dt-bindings/mfd/at91-usart.h) + +Optional properties in serial mode: +- atmel,use-dma-rx: use of PDC or DMA for receiving data +- atmel,use-dma-tx: use of PDC or DMA for transmitting data +- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD line respectively. + It will use specified PIO instead of the peripheral function pin for the USART feature. + If unsure, don't specify this property. +- add dma bindings for dma transfer: + - dmas: DMA specifier, consisting of a phandle to DMA controller node, + memory peripheral interface and USART DMA channel ID, FIFO configuration. + Refer to dma.txt and atmel-dma.txt for details. + - dma-names: "rx" for RX channel, "tx" for TX channel. +- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO + capable USARTs. +- rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt + + compatible description: +- at91rm9200: legacy USART support +- at91sam9260: generic USART implementation for SAM9 SoCs + +Example: +- use PDC: + usart0: serial@fff8c000 { + compatible = "atmel,at91sam9260-usart"; + reg = <0xfff8c000 0x4000>; + interrupts = <7>; + clocks = <&usart0_clk>; + clock-names = "usart"; + atmel,use-dma-rx; + atmel,use-dma-tx; + rts-gpios = <&pioD 15 GPIO_ACTIVE_LOW>; + cts-gpios = <&pioD 16 GPIO_ACTIVE_LOW>; + dtr-gpios = <&pioD 17 GPIO_ACTIVE_LOW>; + dsr-gpios = <&pioD 18 GPIO_ACTIVE_LOW>; + dcd-gpios = <&pioD 20 GPIO_ACTIVE_LOW>; + rng-gpios = <&pioD 19 GPIO_ACTIVE_LOW>; + }; + +- use DMA: + usart0: serial@f001c000 { + compatible = "atmel,at91sam9260-usart"; + reg = <0xf001c000 0x100>; + interrupts = <12 4 5>; + clocks = <&usart0_clk>; + clock-names = "usart"; + atmel,use-dma-rx; + atmel,use-dma-tx; + dmas = <&dma0 2 0x3>, + <&dma0 2 0x204>; + dma-names = "tx", "rx"; + atmel,fifo-size = <32>; + }; + +- SPI mode: + #include + + spi0: spi@f001c000 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "atmel,at91rm9200-usart", "atmel,at91sam9260-usart"; + atmel,usart-mode = ; + reg = <0xf001c000 0x100>; + interrupts = <12 IRQ_TYPE_LEVEL_HIGH 5>; + clocks = <&usart0_clk>; + clock-names = "usart"; + cs-gpios = <&pioB 3 0>; + }; -- cgit v1.2.3