On Fri, Sep 03, 2010 at 10:36:19AM +0200, André Schwarz wrote:
> Hi,
>
> we're about to get new MPC8377 based hardware with various peripherals.
> There are two I2C-to-SPI bridge devices (NXP SC18IS602) and I'm not sure
> how to define a proper dts...
>
> Of course it's an easy thing creating 2 child nodes on the CPU's I2C
> device - but how can I represent the created SPI bus ?
>
> Is the (possibly) required driver (of_sc18is60x_spi ?) supposed to be an
> I2C slave or an SPI host driver ?
Both! The driver would get probed from the i2c bus, and it would
create and register an spi master. If the spi bus registration
includes a pointer to the device tree node, then the child nodes will
automatically be registered as spi_devices.
The dts is also fairly straight forward:
i2c-bus: i...@80001000 {
compatible = <blah>;
#address-cells = <1>;
#size-cells = <0>;
spi-bus: s...@28{
compatible = "nxp,sc18is602";
#address-cells = <1>;
#size-cells = <0x28>;
reg = <0>;
spi-dev...@0 {
compatible = <blah>;
reg = <0>;
};
spi-dev...@1 {
compatible = <blah>;
reg = <1>;
};
spi-dev...@2 {
compatible = <blah>;
reg = <2>;
};
};
};
Cheers,
g.
>
>
> Any help is welcome.
>
>
> --
> Mit freundlichen Grüßen / Best regards
>
> André Schwarz
>
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