tqm5200s i2c bus timeout

[Johannes Braun]

> This is expected since you didn't add sub-nodes for your i2c devices
> 24c32a and PCF8563 in the i2c adapter node.

Ok this was the issue.

>> 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.

According to the two examples, I added the subnodes to both i2c nodes.
Now I can see the rtc clock and the eeproms in /sys/..
# root at generic-powerpc:/sys/bus/i2c/devices# ls
# 0-0050  1-0050  1-0051  i2c-0   i2c-1

Now the i2c section in my dtb file looks as follows:
i2c at 3d00 {
   #address-cells = <1>;
   #size-cells = <0>;
   compatible = "fsl,mpc5200-i2c","fsl-i2c";
   reg = <0x3d00 0x00>;
   interrupts = <2 15 0>;

   eeprom at 50 {
      compatible = "at,24c32";
      reg = <0x50>;
   };
};

i2c at 3d40 {
   #address-cells = <1>;
   #size-cells = <0>;
   compatible = "fsl,mpc5200-i2c","fsl-i2c";
   reg = <0x3d40 0x40>;
   interrupts = <2 16 0>;

   eeprom at 50 {
      compatible = "at,24c32";
      reg = <0x50>;
   };

   rtc at 51 {
      compatible = "pcf8563";
      reg = <0x51>;
   };
};


The good thing is that I can see all the devices now. Also the driver
for the rtc clock is loading. But the time can`t be read through the
registered rtc0 device. This is the kernel log. But I think this is a
driver issue and I should have a look inside the driver.

[    1.483761] rtc-pcf8563 1-0051: chip found, driver version 0.4.3
[    1.490382] rtc-pcf8563 1-0051: pcf8563_get_datetime: read error
[    1.497478] rtc-pcf8563 1-0051: rtc core: registered rtc-pcf8563 as rtc0
...
...
[    1.536540] rtc-pcf8563 1-0051: pcf8563_get_datetime: read error
[    1.542759] rtc-pcf8563 1-0051: hctosys: unable to read the hardware clock


Thanks,
Johannes