Subject: Re: Can't load module spi_mpc83xx : No such device

From: Anton Vorontsov <[email-masked]>
Date: Fri, 27 Feb 2009 15:54:56 +0300

On Fri, Feb 27, 2009 at 03:56:41PM +1100, Dushara Jayasinghe wrote:
> Hi all,
> 
> I'm using linux version 2.6.29-rc5.

Linus' tree is still lacking few patches for spi_mpc83xx driver, the
patches makes spi_mpc83xx work with the device tree directly.

You should use -mm kernels.

[...]
> Part of my device tree is as follows:
> 
> 	soc8349@e0000000 {
> 		...
> 		spi@7000 {
> 			#address-cells = <1>;
> 			#size-cells = <0>;
> 			compatible = "fsl,spi";
> 			reg = <0x7000 0x1000>;
> 			interrupts = <0x10 0x8>;
> 			interrupt-parent = < &ipic >;

You don't seem to have any chip-selects (i.e. gpios = <>) specified.

If the chip-select is always asserted (i.e. there is only one
device on the SPI bus), then..

> 
> 			m25p40@2 {
> 				compatible = "m25p80";
> 				spi-max-frequency = <25000000>;
> 				reg = <2>;

..there is no point in specifying reg = <> for the device.

Thanks,

-- 
Anton Vorontsov
email: [email-masked]
irc://irc.freenode.net/bd2