linux-kernel - Re: [PATCH v2 02/10] iio: document bindings for mounting matrices

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Date:   Tue, 23 Jul 2019 11:46:49 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Song Qiang <songqiang1304521@...il.com>,
        Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>,
        Martin Kelly <mkelly@...o.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        Brian Masney <masneyb@...tation.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Gregor Boirie <gregor.boirie@...rot.com>,
        Sebastian Reichel <sre@...nel.org>,
        Samu Onkalo <samu.onkalo@...el.com>
Subject: Re: [PATCH v2 02/10] iio: document bindings for mounting matrices

Hi Linus,

> Am 23.07.2019 um 09:42 schrieb Linus Walleij <linus.walleij@...aro.org>:
> 
> Hi H. Nikolaus,
> 
> On Thu, Feb 21, 2019 at 6:03 PM H. Nikolaus Schaller <hns@...delico.com> wrote:
> 
>> From: Linus Walleij <linus.walleij@...aro.org>
> 
> It is fair for you to change authorship to yourself at this point.
> Just keeping my Signed-off-by is sufficient.

Well, I think my contribution is less than yours :)

> 
>> The mounting matrix for sensors was introduced in
>> commit dfc57732ad38 ("iio:core: mounting matrix support")
>> 
>> However the device tree bindings are very terse and since this is
>> a widely applicable property, we need a proper binding for it
>> that the other bindings can reference. This will also be useful
>> for other operating systems and sensor engineering at large.
>> 
>> I think all 3D sensors should support it, the current situation
>> is probably that the mounting information is confined in magic
>> userspace components rather than using the mounting matrix, which
>> is not good for portability and reuse.
>> 
>> Cc: Linus Walleij <linus.walleij@...aro.org>
>> Cc: Gregor Boirie <gregor.boirie@...rot.com>
>> Cc: Sebastian Reichel <sre@...nel.org>
>> Cc: Samu Onkalo <samu.onkalo@...el.com>
>> Cc: devicetree@...r.kernel.org
>> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> 
> Did this patch fall off somewhere? I think it's really neat, even in this
> form it is great help for developers. If you want I can try picking up the
> comments and resend it.

Well, I had planned to review it again and promised to send out a new
version. But as usual this ToDo becomes hidden by always more important
tasks.

So I am fine if you can pick comments and resend it. I think there will
be others who help to make it even better in the future if the mount matrix
is more widely used.

BR,
Nikolaus