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

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Message-ID: <cfc090cb87a8b926116d1a436694d17d@manjaro.org>
Date: Fri, 25 Oct 2024 18:11:01 +0200
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 2024-10-25 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.

[*] 
https://lore.kernel.org/linux-kernel/0e1ef28710e3e49222c966f07958a9879fa4e903.1729871544.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";
>> >       };
>> >  };
>>