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

[Dragan Simic <dsimic@manjaro.org>]

Hello Chen-Yu,

On 2024-11-06 07:31, Dragan Simic wrote:
> On 2024-11-06 03:19, Chen-Yu Tsai wrote:
>> On Sat, Oct 26, 2024 at 12:11 AM Dragan Simic <dsimic@manjaro.org> 
>> wrote:
>>> On 2024-10-25 16:47, Chen-Yu Tsai wrote:
>>> > On Wed, Oct 23, 2024 at 5:11 AM Dragan Simic <dsimic@manjaro.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@vger.kernel.org
>>> >> > Helped-by: Ondrej Jirman <megi@xff.cz>
>>> >> > Helped-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
>>> >> > Signed-off-by: Dragan Simic <dsimic@manjaro.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.

Please, let's move forward by "downgrading" the Helped-by tags
in this patch to Suggested-by tags, as you already suggested, to
avoid possible delays with having this mount-matrix fix merged.

We'll see what will happen with the proposed acceptance of the
Helped-by tag, I haven't given up on that yet. :)

> [*] 
> 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";
>>> >> >       };
>>> >> >  };
>>> >>