linux-kernel - Re: [PATCH] arm64: dts: allwinner: pinephone: Add mount matrix to accelerometer

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Message-ID: <6f2c860c442838bd9892d5861b82e73e@manjaro.org>
Date: Wed, 06 Nov 2024 07:31:41 +0100
From: Dragan Simic <dsimic@...jaro.org>
To: wens@...e.org
Cc: linux-sunxi@...ts.linux.dev, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, jernej.skrabec@...il.com, samuel@...lland.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, Ondrej Jirman
 <megi@....cz>, Andrey Skvortsov <andrej.skvortzov@...il.com>
Subject: Re: [PATCH] arm64: dts: allwinner: pinephone: Add mount matrix to
 accelerometer

Hello Chen-Yu,

On 2024-11-06 03:19, Chen-Yu Tsai wrote:
> On Sat, Oct 26, 2024 at 12:11 AM Dragan Simic <dsimic@...jaro.org> 
> wrote:
>> On 2024-10-25 16:47, Chen-Yu Tsai wrote:
>> > On Wed, Oct 23, 2024 at 5:11 AM Dragan Simic <dsimic@...jaro.org>
>> > wrote:
>> >> On 2024-09-19 21:15, Dragan Simic wrote:
>> >> > The way InvenSense MPU-6050 accelerometer is mounted on the user-facing
>> >> > side
>> >> > of the Pine64 PinePhone mainboard, which makes it rotated 90 degrees
>> >> > counter-
>> >> > clockwise, [1] requires the accelerometer's x- and y-axis to be
>> >> > swapped, and
>> >> > the direction of the accelerometer's y-axis to be inverted.
>> >> >
>> >> > Rectify this by adding a mount-matrix to the accelerometer definition
>> >> > in the Pine64 PinePhone dtsi file.
>> >> >
>> >> > [1] https://files.pine64.org/doc/PinePhone/PinePhone%20mainboard%20bottom%20placement%20v1.1%2020191031.pdf
>> >> >
>> >> > Fixes: 91f480d40942 ("arm64: dts: allwinner: Add initial support for
>> >> > Pine64 PinePhone")
>> >> > Cc: stable@...r.kernel.org
>> >> > Helped-by: Ondrej Jirman <megi@....cz>
>> >> > Helped-by: Andrey Skvortsov <andrej.skvortzov@...il.com>
>> >> > Signed-off-by: Dragan Simic <dsimic@...jaro.org>
>> >>
>> >> Just a brief reminder about this patch...  Please, let me know if some
>> >> further work is needed for it to become accepted.
>> >
>> > There's no "Helped-by" tag, and checkpatch would complain. The closest
>> > would be either Suggested-by or Co-developed-by, but with the latter
>> > you would also need their Signed-off-by.
>> 
>> Thanks for your response.  You're totally right about checkpatch.pl
>> not supporting Helped-by tags, but including neither Suggested-by
>> nor Co-developed-by would fit very well in this case, because the
>> associated level of credit falls right somewhere between what's
>> indicated by these two tags.
>> 
>> > I can change it to Suggested-by if that's OK with you.
>> 
>> I've created and submitted a patch [*] that adds support for Helped-by
>> tags to checkpatch.pl.  Let's see what kind of feedback that patch
>> will receive, and then we'll be able to move forward accordingly.
> 
> There doesn't seem to be any activity. Maybe also try adding it to the
> 
>     Documentation/process/submitting-patches.rst
> 
> document?

Good idea, thanks!  I've created and submitted the v2 [**] of my
other patch, so it now also adds a description of the proposed
Helped-by tag to Documentation/process/submitting-patches.rst.
Let's see will that spark some interest.

[*] 
https://lore.kernel.org/linux-kernel/0e1ef28710e3e49222c966f07958a9879fa4e903.1729871544.git.dsimic@manjaro.org/T/#u
[**] 
https://lore.kernel.org/linux-kernel/cover.1730874296.git.dsimic@manjaro.org/T/#u

>> >> > ---
>> >> >
>> >> > Notes:
>> >> >     See also the linux-sunxi thread [2] that has led to this patch,
>> >> > which
>> >> >     provides a rather detailed analysis with additional details and
>> >> > pictures.
>> >> >     This patch effectively replaces the patch submitted in that thread.
>> >> >
>> >> >     [2]
>> >> > https://lore.kernel.org/linux-sunxi/20240916204521.2033218-1-andrej.skvortzov@gmail.com/T/#u
>> >> >
>> >> >  arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi | 3 +++
>> >> >  1 file changed, 3 insertions(+)
>> >> >
>> >> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
>> >> > b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
>> >> > index 6eab61a12cd8..b844759f52c0 100644
>> >> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
>> >> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
>> >> > @@ -212,6 +212,9 @@ accelerometer@68 {
>> >> >               interrupts = <7 5 IRQ_TYPE_EDGE_RISING>; /* PH5 */
>> >> >               vdd-supply = <&reg_dldo1>;
>> >> >               vddio-supply = <&reg_dldo1>;
>> >> > +             mount-matrix = "0", "1", "0",
>> >> > +                            "-1", "0", "0",
>> >> > +                            "0", "0", "1";
>> >> >       };
>> >> >  };
>> >>