linux-kernel - Re: [PATCH v7 1/5] staging: vc04_services: vchiq

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Date:   Tue, 20 Jun 2023 20:36:11 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Umang Jain <umang.jain@...asonboard.com>,
        linux-staging@...ts.linux.dev,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, stefan.wahren@...e.com,
        f.fainelli@...il.com, athierry@...hat.com, error27@...il.com,
        dave.stevenson@...pberrypi.com, kieran.bingham@...asonboard.com
Subject: Re: [PATCH v7 1/5] staging: vc04_services: vchiq_arm: Add new bus
 type and device type

On Tue, Jun 20, 2023 at 09:20:54PM +0300, Laurent Pinchart wrote:
> On Tue, Jun 20, 2023 at 04:17:05PM +0200, Greg KH wrote:
> > On Tue, Jun 20, 2023 at 07:11:48PM +0530, Umang Jain wrote:
> > > The devices that the vchiq interface registers (bcm2835-audio,
> > > bcm2835-camera) are implemented and exposed by the VC04 firmware.
> > > The device tree describes the VC04 itself with the resources required
> > > to communicate with it through a mailbox interface. However, the
> > > vchiq interface registers these devices as platform devices. This
> > > also means the specific drivers for these devices are getting
> > > registered as platform drivers. This is not correct and a blatant
> > > abuse of platform device/driver.
> > > 
> > > Add a new bus type, vchiq_bus_type and device type (struct vchiq_device)
> > > which will be used to migrate child devices that the vchiq interfaces
> > > creates/registers from the platform device/driver.
> > > 
> > > Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
> > > ---
> > >  drivers/staging/vc04_services/Makefile        |  1 +
> > >  .../interface/vchiq_arm/vchiq_device.c        | 78 +++++++++++++++++++
> > >  .../interface/vchiq_arm/vchiq_device.h        | 43 ++++++++++
> > >  3 files changed, 122 insertions(+)
> > >  create mode 100644 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_device.c
> > >  create mode 100644 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_device.h
> > > 
> > > diff --git a/drivers/staging/vc04_services/Makefile b/drivers/staging/vc04_services/Makefile
> > > index 44794bdf6173..2d071e55e175 100644
> > > --- a/drivers/staging/vc04_services/Makefile
> > > +++ b/drivers/staging/vc04_services/Makefile
> > > @@ -5,6 +5,7 @@ vchiq-objs := \
> > >     interface/vchiq_arm/vchiq_core.o  \
> > >     interface/vchiq_arm/vchiq_arm.o \
> > >     interface/vchiq_arm/vchiq_debugfs.o \
> > > +   interface/vchiq_arm/vchiq_device.o \
> > >     interface/vchiq_arm/vchiq_connected.o \
> > >  
> > >  ifdef CONFIG_VCHIQ_CDEV
> > > diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_device.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_device.c
> > > new file mode 100644
> > > index 000000000000..e16279a25126
> > > --- /dev/null
> > > +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_device.c
> > > @@ -0,0 +1,78 @@
> > > +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
> > 
> > Code that directly interacts with the driver core can, for obvious
> > reasons, not be BSD-3 licensed, sorry.
> > 
> > Also, why is any of this dual licensed?  What good is any of that?  In
> > order for me to accept new dual-licensed code, it needs to be documented
> > in the changelog very very well as to exactly why this is required, as
> > the legal issues involved in maintaining dual-licensed code like this is
> > tricky and easy to get wrong (as proven here already in this patch...)
> 
> The whole vchiq_arm layer is dual licensed GPL-2.0 + BSD-3. I assume
> this is why Umang used the same licensing terms. We can use GPL-2.0 only
> if this patch qualifies as original work and not derived work of the
> existing code.

This is most certainly original work, not related to the original code
here, and can never work in a BSD-3 licensed environment.

thanks,

greg k-h