Appropriate method of io remapping a single memory location?

[maitysanchayan at gmail.com]

Hello,

I am adding a small piece of code to expose SoC specific information 
while following the below information, for a Cortex A5 platform.

https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-soc

For the SoC device attribute revision, I need to access a location 0x80 
for reading the ROM revision information. I am kinda stuck at trying to 
find the appropriate way to read this location.

The devm_ioremap* functions take a device pointer which I can manage but 
they also need a struct resource argument and devm_ioremap requries a 
resource_size_t as well. Having only a specific location to read, 
without having any struct resource what would be the appropriate way to 
get this information.

- Sanchayan.