linux-kernel - Re: [PATCH v3 4/4] Input: add Apple SPI keyboard and trackpad driver.

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Date:   Wed, 27 Mar 2019 19:45:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Ronald Tschalär <ronald@...ovation.ch>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Lukas Wunner <lukas@...ner.de>,
        Federico Lorenzi <federico@...velground.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] Input: add Apple SPI keyboard and trackpad driver.

On Wed, Mar 27, 2019 at 11:35:30AM +0200, Andy Shevchenko wrote:
> On Tue, Mar 26, 2019 at 06:48:07PM -0700, Ronald Tschalär wrote:
> > The keyboard and trackpad on recent MacBook's (since 8,1) and
> > MacBookPro's (13,* and 14,*) are attached to an SPI controller instead
> > of USB, as previously. The higher level protocol is not publicly
> > documented and hence has been reverse engineered. As a consequence there
> > are still a number of unknown fields and commands. However, the known
> > parts have been working well and received extensive testing and use.
> > 
> > In order for this driver to work, the proper SPI drivers need to be
> > loaded too; for MB8,1 these are spi_pxa2xx_platform and spi_pxa2xx_pci;
> > for all others they are spi_pxa2xx_platform and intel_lpss_pci. For this
> > reason enabling this driver in the config implies enabling the above
> > drivers.
> 
> > +// SPDX-License-Identifier: GPL-2.0
> 
> According to last changes this should be GPL-2.0-only

What "last changes"?  "GPL-2.0" is a totally valid SPDX identifier for
the kernel.  Don't buy into the "-only" prefix crud that the newer SPDX
version adopted for crazy reasons.  The in-kernel documentation lists
the valid identifiers and the version of SPDX we are currently using.

thanks,

greg k-h