linux-kernel - Re: [PATCH 5/5] Input: Add ChromeOS EC keyboard driver

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Message-ID: <2990462.l5jY89jKQx@dtor-d630.eng.vmware.com>
Date:	Fri, 14 Dec 2012 17:43:31 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Simon Glass <sjg@...omium.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Luigi Semenzato <semenzato@...omium.org>,
	Vincent Palatin <vpalatin@...omium.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Sourav Poddar <sourav.poddar@...com>,
	Felipe Balbi <balbi@...com>, Olof Johansson <olof@...om.net>,
	Roland Stigge <stigge@...com.de>,
	Wolfram Sang <w.sang@...gutronix.de>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-input@...r.kernel.org
Subject: Re: [PATCH 5/5] Input: Add ChromeOS EC keyboard driver

On Saturday, December 15, 2012 01:13:45 AM Grant Likely wrote:
> On Wed, 12 Dec 2012 13:33:48 -0800, Simon Glass <sjg@...omium.org> wrote:
> > Use the key-matrix layer to interpret key scan information from the EC
> > and inject input based on the FDT-supplied key map. This driver registers
> > itself with the ChromeOS EC driver to perform communications.
> > 
> > Additional FDT bindings are provided to specify rows/columns and the
> > auto-repeat information.
> > 
> > Signed-off-by: Simon Glass <sjg@...omium.org>
> > Signed-off-by: Luigi Semenzato <semenzato@...omium.org>
> > Signed-off-by: Vincent Palatin <vpalatin@...omium.org>
> > ---
> > 
> >  .../devicetree/bindings/input/cros-ec-keyb.txt     |   77 ++++
> >  drivers/input/keyboard/Kconfig                     |   10 +
> >  drivers/input/keyboard/Makefile                    |    1 +
> >  drivers/input/keyboard/cros_ec_keyb.c              |  413
> >  ++++++++++++++++++++ 4 files changed, 501 insertions(+), 0 deletions(-)
> >  create mode 100644
> >  Documentation/devicetree/bindings/input/cros-ec-keyb.txt
> >  create mode 100644 drivers/input/keyboard/cros_ec_keyb.c
> > 
> > diff --git a/Documentation/devicetree/bindings/input/cros-ec-keyb.txt
> > b/Documentation/devicetree/bindings/input/cros-ec-keyb.txt new file mode
> > 100644
> > index 0000000..67f51d8
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/input/cros-ec-keyb.txt
> > @@ -0,0 +1,77 @@
> > +ChromeOS EC Keyboard
> > +
> > +Google's ChromeOS EC Keyboard is a simple matrix keyboard implemented on
> > +a separate EC (Embedded Controller) device. It provides a message for
> > reading +key scans from the EC. These are then converted into keycodes
> > for processing +by the kernel.
> > +
> > +Required properties:
> > +- compatible: "google,cros-ec-keyb"
> > +- google,key-rows: Number of keyboard rows (must be <= 8)
> > +- google,key-columns: Number of keyboard columns (must be <= 13)
> > +- google,repeat-delay-ms: Key repeat delay in milliseconds
> > +- google,repeat-rate-ms: Key repeat rate in milliseconds
> 
> Hmmm, these should probably be in a common binding. Take a look at
> the other input bindings and make a proposal for properties to add to
> matrix-keymap.txt.

Actually these are not essentia for bringup and can be set from userspace,
so I'd say simply drop them.

Thanks.

--  
Dmitry
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