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 11:11:50 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Lukasz Majewski <lukma@...x.de>
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 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.

Thanks