On Tuesday, July 12, 2016 5:06:10 PM CEST Wan Zongshun wrote:

On 2016?07?11? 16:03, Arnd Bergmann wrote:

quoted

On Sunday, July 10, 2016 3:27:26 PM CEST Wan Zongshun wrote:
I'm still a bit unsure about the set of attributes here.

- The "soc_id" is read from the device tree from the field that contains
   the board name, I think for consistency you should try to map the
   GCR_CHIPID to the name of the SoC and assign that here

- The "machine" is hardcoded to "NUC900EVB", which in turn looks like
   a particular board but not the one you are running on. Maybe read
   that from the DT instead?

- The "revision" is not filled at all, I would suggest using something
   derived from the GCR_CHIPID register here

- you have two nonstandard attributes "chipid" and "version", which
   I'd hope to avoid -- the set of standard attributes is supposed to
   give enough information about the machine, and platform independent
   user space will never read those.

So, Maybe I can remove those two codes, no need push those information 
to user space?

device_create_file(soc_device_to_device(soc_dev), &nuc900_chipid_attr);
device_create_file(soc_device_to_device(soc_dev), &nuc900_version_attr);

Yes, that would be good.

	Arnd