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 15:58:12 +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 Sat, May 19, 2018 at 9:02 AM, Lukasz Majewski <lukma@...x.de>
> wrote:
> 
> > After removing imx53-kp-ddc and imx53-kp-common iomux subnodes I do
> > see following errors in the dmesg (v4.17-rc5):
> >
> > imx53-pinctrl 53fa8000.iomuxc: function 'iomuxc' not supported
> > imx53-pinctrl 53fa8000.iomuxc: invalid function iomuxc in map
> > table  
> 
> Could you please investigate this error?

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?

[I'm using linux 4.17-rc7 (with included dtc 1.4.6)]

> 
> I have just tried the following change on a imx53-qsb:
> http://code.bulix.org/ik01yu-339697
> 
> and it works as expected:
> # dmesg  | grep iomux
> [    0.100046] imx53-pinctrl 53fa8000.iomuxc: initialized IMX pinctrl
> driver

Best regards,

Lukasz Majewski

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