projects / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 53633a89 TR |
1 | * Device tree bindings for Atmel Flexcom (Flexible Serial Communication Unit) |
| 2 | ||
| 3 | The Atmel Flexcom is just a wrapper which embeds a SPI controller, an I2C | |
| 4 | controller and an USART. Only one function can be used at a time and is chosen | |
| 5 | at boot time according to the device tree. | |
| 6 | ||
| 7 | Required properties: | |
| 8 | - compatible: Should be "atmel,sama5d2-flexcom" | |
| 9 | or "microchip,sam9x7-flexcom", "atmel,sama5d2-flexcom" | |
| 10 | - reg: Should be the offset/length value for Flexcom dedicated | |
| 11 | I/O registers (without USART, TWI or SPI registers). | |
| 12 | - clocks: Should be the Flexcom peripheral clock from PMC. | |
| 13 | - #address-cells: Should be <1> | |
| 14 | - #size-cells: Should be <1> | |
| 15 | - ranges: Should be one range for the full I/O register region | |
| 16 | (including USART, TWI and SPI registers). | |
| 17 | - atmel,flexcom-mode: Should be one of the following values: | |
| 18 | - <1> for USART | |
| 19 | - <2> for SPI | |
| 20 | - <3> for I2C | |
| 21 | ||
| 22 | Required child: | |
| 23 | A single available child device of type matching the "atmel,flexcom-mode" | |
| 24 | property. | |
| 25 | ||
| 26 | The phandle provided by the clocks property of the child is the same as one for | |
| 27 | the Flexcom parent. | |
| 28 | ||
| 29 | For other properties, please refer to the documentations of the respective | |
| 30 | device: | |
| 31 | - ../serial/atmel-usart.txt | |
| 32 | - ../spi/spi_atmel.txt | |
| 33 | - ../i2c/i2c-at91.txt | |
| 34 | ||
| 35 | Example: | |
| 36 | ||
| 37 | flexcom@f8034000 { | |
| 38 | compatible = "atmel,sama5d2-flexcom"; | |
| 39 | reg = <0xf8034000 0x200>; | |
| 40 | clocks = <&flx0_clk>; | |
| 41 | #address-cells = <1>; | |
| 42 | #size-cells = <1>; | |
| 43 | ranges = <0x0 0xf8034000 0x800>; | |
| 44 | atmel,flexcom-mode = <2>; | |
| 45 | ||
| 46 | spi@400 { | |
| 47 | compatible = "atmel,at91rm9200-spi"; | |
| 48 | reg = <0x400 0x200>; | |
| 49 | interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>; | |
| 50 | pinctrl-names = "default"; | |
| 51 | pinctrl-0 = <&pinctrl_flx0_default>; | |
| 52 | #address-cells = <1>; | |
| 53 | #size-cells = <0>; | |
| 54 | clocks = <&flx0_clk>; | |
| 55 | clock-names = "spi_clk"; | |
| 56 | atmel,fifo-size = <32>; | |
| 57 | ||
| 58 | flash@0 { | |
| 59 | compatible = "atmel,at25f512b"; | |
| 60 | reg = <0>; | |
| 61 | spi-max-frequency = <20000000>; | |
| 62 | }; | |
| 63 | }; | |
| 64 | }; |