Hi Cyrille,
On Mon, 15 Jun 2015 18:38:04 +0200
Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx> wrote:
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx>
> ---
> .../devicetree/bindings/mfd/atmel-flexcom.txt | 28 ++++++++++++++++++++++
> 1 file changed, 28 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..6b1a32e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/atmel-flexcom.txt
> @@ -0,0 +1,28 @@
> +* 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: must be present
> +- atmel,flexcom-mode: shall be a string among { "spi", "usart", "i2c", "twi" }.
> + "i2c" and "twi" are synonymous.
> +
> +Example:
> +
> +flx0: flexcom@f8034000 {
> + compatible = "atmel,sama5d2-flexcom";
> + reg = <0xf8034000 0x200>;
> + clocks = <&flx0_clk>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> + atmel,flexcom-mode = "spi";
> +};
Since the subdevices are using a set of registers contained by the
flexcom device I would define it like this:
flx0: flexcom@f8034000 {
compatible = "atmel,sama5d2-flexcom";
reg = <0xf8034000 0x800>;
clocks = <&flx0_clk>;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0x0 0xf8034000 0x800>;
atmel,flexcom-mode = "spi";
usart@200 {
reg = <0x200 0x100>;
/* ... */
};
spi@400 {
reg = <0x400 0x100>;
/* ... */
};
i2c@600 {
reg = <0x600 0x100>;
/* ... */
};
};
Best Regards,
Boris
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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