On Tue, May 5, 2015 at 12:18 PM, <maitysanchayan@gmail.com> wrote:
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.
If the register / memory location is only used for that specific purpose then using something like reg = <0x00000080 0x4> in the DT node is perfectly fine. But if the register is part of a larger device you can use a syscon device to represent that. -- Carlo Caione