Hi,
On Thu, 3 Jan 2013 14:20:41 +0100
Johannes Braun <jjo.br...@gmail.com> wrote:
> Hello,
>
> I hope someone could help me with my problem. Currently I am porting
> a new kernel (3.3.8) for a tqm5200s based board.
> The previous kernel was 2.6.23. The new kernel version is needed because
> of support for a wireless card.
>
> I got issues with the i2c bus and this kernel. When the kernel boots up,
> the i2c initialization ends in a timout. This is the kernel log:
>
> [ 1.460652] i2c /dev entries driver
> [ 1.465434] mpc-i2c f0003d40.i2c: timeout 1000000 us
No, the initialization doesn't end in timeout. It is just an info
which timeout value will be used for i2c transfers.
>
> Connected to the bus is an eeprom (Microchip 24c32a) and a realtime
> clock (Philips PCF8563).
> The i2c bus section in the dtb file looks as follows:
>
> i2c@3d40 {
> #address-cells = <1>;
> #size-cells = <0>;
> compatible = "fsl,mpc5200-i2c","fsl-i2c";
> reg = <0x3d40 0x40>;
> interrupts = <2 16 0>;
> fsl5200-clocking;
This "fsl5200-clocking" property is not needed anymore, you can remove it.
> };
>
> The dtb file from the kernel 2.6.23 looks as follows:
> i2c@3d40 {
>
> #address-cells = <1>;
> #size-cells = <0>;
> compatible = "fsl,mpc5200-i2c","fsl-i2c";
> reg = <0x3d40 0x40>;
> interrupts = <2 16 0>;
> fsl5200-clocking;
> };
>
> I can`t see any devices in /sys/bus/i2c/devices except the bus itself.
> # ls /sys/bus/i2c/devices
> # i2c-0
> # cat /sys/bus/i2c/devices/i2c-0/name
> # MPC adapter
This is expected since you didn't add sub-nodes for your i2c devices
24c32a and PCF8563 in the i2c adapter node.
> Is there something wrong with my dtb file or is it a bug in the mpc-i2c driver
It is an issue with our dtb file. Please look at the I2C eeprom
sub-node in the arch/powerpc/boot/dts/mpc5121ads.dts file and at
the pcf8563 RTC sub-node in the arch/powerpc/boot/dts/mucmc52.dts
file for an example how to add needed nodes for your devices.
Thanks,
Anatolij
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