[PATCH v3 2/8] imxrt1020: fix lpuart issue in common u-boot device tree

[Marcel Ziswiler]

Hi Giulio

On Sun, 2022-10-23 at 01:32 +0200, Giulio Benetti wrote:
> Hi Marcel,
> 
> thanks for contributing,

You are very welcome.

> Il 22/10/2022 23:42, Marcel Ziswiler ha scritto:
> > From: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> > 
> > Fix lpuart issue in common U-Boot device tree.
> 
> There's no need to repeat in commit log the subject.

Well, most maintainers do want an actual commit message and won't accept it being empty. For trivial commits
like this one it is quite common to therefore just repeat the subject.

> > Signed-off-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> > ---
> > 
> > (no changes since v1)
> > 
> >   arch/arm/dts/imxrt1020-evk-u-boot.dtsi | 7 ++++---
> >   arch/arm/dts/imxrt1020-evk.dts         | 1 -
> >   2 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/arm/dts/imxrt1020-evk-u-boot.dtsi b/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
> > index 9e1b074d2e..7cab486f5f 100644
> > --- a/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
> > +++ b/arch/arm/dts/imxrt1020-evk-u-boot.dtsi
> > @@ -67,9 +67,6 @@
> >   
> >         imxrt1020-evk {
> >                 u-boot,dm-spl;
> > -               pinctrl_lpuart1: lpuart1grp {
> > -                       u-boot,dm-spl;
> > -               };
> >   
> >                 pinctrl_semc: semcgrp {
> >                         u-boot,dm-spl;
> > @@ -81,6 +78,10 @@
> >         };
> >   };
> >   
> > +&pinctrl_lpuart1 {
> > +       u-boot,dm-spl;
> > +};
> > +
> 
> I don't understand the goal of this change, can you elaborate?

Well, the goal is to use them Linux kernel device trees and have any required changes in such -u-boot.dtsi
device tree include files. As such we may just reference resp. node by its handle and subsequently add that U-
Boot specific property.

> As I remember pinctrl_lpuart1 already works correctly. The same goes
> for:
> pinctrl_semc
> pinctrl_usdhc0
> 
> So you're not fixing something.

Well, I am basically fixing it for when them device trees get synchronised from the Linux kernel. One may
basically consider out-of-synch device trees being an issue in need of fixing.

> >   &usdhc1 {
> >         u-boot,dm-spl;
> >   };
> > diff --git a/arch/arm/dts/imxrt1020-evk.dts b/arch/arm/dts/imxrt1020-evk.dts
> > index 22ae5ed735..d4d1de4ea8 100644
> > --- a/arch/arm/dts/imxrt1020-evk.dts
> > +++ b/arch/arm/dts/imxrt1020-evk.dts
> > @@ -6,7 +6,6 @@
> >   
> >   /dts-v1/;
> >   #include "imxrt1020.dtsi"
> > -#include "imxrt1020-evk-u-boot.dtsi"
> 
> This ^^^ is needed, please revert it.

No, you do not understand. We just synchronise them device trees from the Linux kernel. Nothing should ever be
changed here. Any and all U-Boot specific changes need to go into the -u-boot.dtsi device tree include files
which BTW get included automatically by the U-Boot build system.

> >   #include "imxrt1020-pinfunc.h"
> >   
> >   / {
> 
> Have you also tested the change on a board?

As outlined in the cover letter I did not test each and every board as I do not have them all available. If you
do have some of those boards available I would appreciate you giving it a try.

Thanks!

> Best regards
> -- 
> Giulio Benetti
> CEO/CTO at Benetti Engineering sas

Cheers

Marcel