Re: [PATCH] fpga: add simple userspace interface to trigger FPGA programming

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

On Sat, 9 Dec 2017 10:05:55 -0800, Florian Fainelli wrote:

> > The problem I see with this is that it's allowing userspace to switch
> > out what's on the FPGA without controlling bridges and without
> > unloading drivers first.  
> 
> We can actually use the Linux device driver model to do that though.
> Assuming all peripherals behind the FPGA do have the FPGA manager's
> struct device as a parent (which they should),

Well in my setup, that isn't the case. The device implemented in the
FPGA is a PCIe endpoint, so its parent device from a device model point
of view if the PCIe root complex, which is a platform_device in the SoC.

So there is currently no connection between the PCIe endpoint
implemented in the FPGA, and the FPGA device itself.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com