Appropriate method of io remapping a single memory location?

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.