Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx> --- .../devicetree/bindings/mfd/atmel-flexcom.txt | 58 ++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/atmel-flexcom.txt diff --git a/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt b/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt new file mode 100644 index 0000000..38f0e43 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt @@ -0,0 +1,58 @@ +* Device tree bindings for Atmel Flexcom (Flexible Serial Communication Unit) + +The Atmel Flexcom is just a wrapper which embeds a SPI controller, an I2C +controller and an USART. Only one function can be used at a time and is chosen +at boot time according to the device tree. + +Required properties: +- compatible: "atmel,sama5d2-flexcom" +- reg: shall be the offset/length value for Flexcom dedicated I/O registers + (without USART, TWI or SPI registers). +- clocks: shall be the Flexcom peripheral clock from PMC. +- #address-cells: should be <1> +- #size-cells: should be <1> +- ranges: one range for the full I/O register region (including USART, TWI and + SPI registers) +- atmel,flexcom-mode: shall be a string among { "spi", "usart", "i2c", "twi" }. + "i2c" and "twi" are synonymous. + +Required child: +a child device of type matching the "atmel,flexcom-mode" property. +The reg property of this child should be: +- <0x200 0x200> for USART +- <0x400 0x200> for SPI +- <0x600 0x200> for I2C +The phandle provided by the clocks property of the child is the same as one for +the Flexcom parent. +Other properties remain unchanged. See documentation of the respective device. + +Example: + +flx0: flexcom@f8034000 { + compatible = "atmel,sama5d2-flexcom"; + reg = <0xf8034000 0x200>; + clocks = <&flx0_clk>; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0x0 0xf8034000 0x800>; + atmel,flexcom-mode = "spi"; + + spi@f8034400 { + compatible = "atmel,at91rm9200-spi"; + reg = <0x400 0x200>; + interrupts = <19 IRQ_TYPE_LEVEL_HIGH 7>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_flx0_ioset1>; + #address-cells = <1>; + #size-cells = <0>; + clocks = <&flx0_clk>; + clock-names = "spi_clk"; + atmel,fifo-size = <32>; + + mtd_dataflash@0 { + compatible = "atmel,at25f512b"; + reg = <0>; + spi-max-frequency = <20000000>; + }; + }; +}; -- 1.8.2.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html