linux-kernel - Re: [PATCH] ARM: DTS: imx53: Add support for imx53 HSC/DDC boards from K+P

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Date:   Tue, 29 May 2018 17:09:39 +0200
From:   Lukasz Majewski <lukma@...x.de>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: DTS: imx53: Add support for imx53 HSC/DDC boards
 from K+P

Hi Fabio,

> Hi Lukasz,
> 
> On Tue, May 29, 2018 at 10:58 AM, Lukasz Majewski <lukma@...x.de>
> wrote:
> 
> > Sorry for "small" delay on this.
> >
> > Ok, so I've investigated the issue:
> >
> > 1. The code, which you pasted:
> > http://code.bulix.org/ik01yu-339697
> >
> > works correctly as imx53-qsb-common.dtsi directly includes
> > "imx53.dtsi" in which iomuxc label is defined.
> >
> > In my case though,
> >
> > 2. I do include imx53-tqma53.dtsi [1], in which the iomuxc" label
> > is extended:
> >
> > &iomuxc {
> >         pinctrl-names = "default";
> >         pinctrl-0 = <&pinctrl_hog>;
> >
> >         imx53-tqma53 {
> >                 pinctrl_hog: hoggrp {
> >
> > .......
> >
> > };
> >
> > The imx53-tqma53.dtsi then includes imx53.dtsi.
> >
> > Moreover, my file -> imx53-kp.dtsi as it includes [1], it extends
> > further the &iomuxc label:
> >
> > &iomuxc {
> >         pinctrl-names = "default";
> >         pinctrl-0 = <&pinctrl_kp_common>;
> >
> >         imx53-kp-common {
> >                 pinctrl_buzzer: buzzergrp {
> > .......
> > };
> >
> > So, when I remove imx53-kp-common I will have mismatch with [1]
> > iomuxc structure.
> >
> > The code works as expected when I do remove imx53-tqma53 in [1].
> >
> > However, I would prefer to not touch this imx53-tqma53.dtsi file.
> > It is also included in: imx53-mba53.dts, which extends iomux in
> > following way:
> >
> > &iomuxc {
> >         lvds1 {
> >                 pinctrl_lvds1_1: lvds1-grp1 {
> >
> >
> > Here I would need to remove lvds1, disp1 and tve to make it working.
> > However, it will not break during build, but at run time.
> >
> > Considering the above, I would prefer to leave the code in [1] as is
> > and use imx53-kp-common as well (as in v2 of this patch).
> >
> > Fabio, what do you think?  
> 
> Ok, thanks for the clarification. I just wanted to make sure we did
> not have some kind of iomux bug there.
> 
> I think your proposed patch is fine then.

Would you be so kind and add your Reviwed-by or Acked-by tag to second
version of this patch?

[PATCH v2] ARM: DTS: imx53: Add support for imx53 HSC/DDC boards from
K+P

> 
> Thanks




Best regards,

Lukasz Majewski

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