linux-kernel - Re: [PATCH] PCI: altera: Allow building as module

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Date:   Tue, 4 Jun 2019 08:18:48 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ley Foon Tan <ley.foon.tan@...el.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, lftan.linux@...il.com
Subject: Re: [PATCH] PCI: altera: Allow building as module

On Wed, Apr 24, 2019 at 12:57:14PM +0800, Ley Foon Tan wrote:
> Altera PCIe Rootport IP is a soft IP and is only available after
> FPGA image is programmed.
> 
> Make driver modulable to support use case FPGA image is programmed
> after kernel is booted. User proram FPGA image in kernel then only load
> PCIe driver module.

I'm not objecting to these patches, but help me understand how this
works.  The "usual" scenario is that if a driver is loaded before a
matching device is available, i.e., either the driver is built
statically or it is loaded before a device is hot-added, the event of
the device being available causes the driver's probe method to be
called.

This seems to be a more manual process of programming the FPGA which
results in a new "altera-pcie" platform device.  And then apparently
you need to load the appropriate module by hand?  Is there no
"hot-add" type of event for this platform device that automatically
looks for the driver?

Bjorn