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

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Message-ID: <CAFiDJ5_e_iuLPUFnwPo+Sq0C9N_OgFmafJ7dCKZE-7hUC=q1YA@mail.gmail.com>
Date:   Tue, 11 Jun 2019 15:22:27 +0800
From:   Ley Foon Tan <lftan.linux@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Ley Foon Tan <ley.foon.tan@...el.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-kernel@...r.kernel.org,
        linux-pci <linux-pci@...r.kernel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH] PCI: altera: Allow building as module

On Tue, Jun 4, 2019 at 9:18 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> 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?
Yes, we need load module manually now.

Regards
Ley Foon