Re: [RFC 1/1] of-fpga-region: Add sysfs interface support for FPGA configuration

[Xu Yilun]

On Fri, Jul 26, 2024 at 12:08:19PM +0530, Nava kishore Manne wrote:
> Adds sysfs interface as part of the of-fpga-region. This newly added
> sysfs interface uses Device Tree Overlay (DTO) files to configure/reprogram
> an FPGA while an operating system is running.This solution will not change
> the existing sequence When a DT overlay that targets an FPGA Region is
> applied.
> 	- Disable appropriate FPGA bridges.
> 	- Program the FPGA using the FPGA manager.
> 	- Enable the FPGA bridges.
> 	- The Device Tree overlay is accepted into the live tree.
> 	- Child devices are populated.
> 
> When the overlay is removed, the child nodes will be removed, and the FPGA
> Region will disable the bridges.
> 
> Usage:
> To configure/reprogram an FPGA region:
> echo "fpga.dtbo" > /sys/class/fpga_region/<region>/device/load

IIRC, last time we are considering some generic interface for both OF &
non-OF FPGA region, but this is still OF specific.

Thanks,
Yilun