linux-kernel - Re: [PATCH 2/2] ARM: dts: imx6q: Add Variscite MX6 Custom board support

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Message-ID: <CADvTj4ptXGo8bcZ65hq-JzOpJdwsV1JwTO8c-=ziLtbeZD4A=Q@mail.gmail.com>
Date:   Wed, 19 Jul 2023 14:04:58 -0600
From:   James Hilliard <james.hilliard1@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     devicetree@...r.kernel.org,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: dts: imx6q: Add Variscite MX6 Custom board support

On Wed, Jul 19, 2023 at 1:32 PM Fabio Estevam <festevam@...il.com> wrote:
>
> Hi James,
>
> On Wed, Jul 19, 2023 at 1:01 PM James Hilliard
> <james.hilliard1@...il.com> wrote:
> >
> > This patch adds support for the Variscite MX6 SoM Carrier Board.
> >
> > This Carrier-Board has the following :
> > - LVDS interface for the VLCD-CAP-GLD-LVDS 7" LCD 800 x 480 touch display
> > - HDMI Connector
> > - USB Host + USB OTG Connector
> > - 10/100/1000 Mbps Ethernet
> > - miniPCI-Express slot
> > - SD Card connector
> > - Audio Headphone/Line In jack connectors
> > - S-ATA
> > - On-board DMIC
> > - RS485 Header
> > - CAN bus header
> > - SPI header
> > - Camera Interfaces header
> > - OnBoard RTC with Coin Backup battery socket
> > - RS232 Debug Header (IDC10)
> > - RS232 DTE
>
> Good, but what exactly has been tested?

Well so far the basics such as the screen/networking and such seem to work.

Tested with:
https://www.variscite.com/product/evaluation-kits/var-som-mx6-kits/
Part number VAR-DVK-MX6_V2-PRO

As well as another custom PCB with a very similar design using the SOM.

>
> > Product Page : https://www.variscite.com/product/single-board-computers/var-mx6customboard
> >
> > The dts file based on the ones provided by Variscite on their own
> > kernel, but adapted for mainline.
> >
> > Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
> > Signed-off-by: James Hilliard <james.hilliard1@...il.com>
>
> Is this patch from you or Gregory? If Gregory is the author, then his
> name should appear in the From: line.

It's from me, the original(seemingly abandoned) patch was from Gregory on the
mailing list which I have been attempting to clean up.

>
> > +&iomuxc {
> > +       imx6qdl-var-som-mx6 {
>
> This ' imx6qdl-var-som-mx6' should be dropped.
>
> > +
> > +               pinctrl_ipu1: ipu1grp {
> > +                       fsl,pins = <
> > +                               MX6QDL_PAD_DI0_DISP_CLK__IPU1_DI0_DISP_CLK      0x10
> > +                               MX6QDL_PAD_DI0_PIN15__IPU1_DI0_PIN15            0x10
> > +                               MX6QDL_PAD_DI0_PIN2__IPU1_DI0_PIN02             0x10
> > +                               MX6QDL_PAD_DI0_PIN3__IPU1_DI0_PIN03             0x10
> > +                               MX6QDL_PAD_DI0_PIN4__IPU1_DI0_PIN04             0x80000000
>
> No 0x80000000 please. Use the real pad ctl value instead.
> This applies globally.
>
> &mipi_csi {
> > +       status = "okay";
> > +       ipu_id = <0>;
> > +       csi_id = <1>;
> > +       v_channel = <0>;
> > +       lanes = <2>;
>
> These are all NXP vendor devicetree properties. They do not exist upstream.
>
> > +       lvds-channel@0 {
> > +               fsl,data-mapping = "spwg";
> > +               fsl,data-width = <24>;
> > +               status = "okay";
> > +               primary;
>
> This property does not exist upstream.
>
> > +       lvds-channel@1 {
> > +               fsl,data-mapping = "spwg";
> > +               fsl,data-width = <24>;
> > +               status = "okay";
> > +               primary;
>
> Ditto.
>
> > +&usbphy1 {
> > +       tx-d-cal = <0x5>;
>
> In upstream it is called fsl,tx-d-cal.
>
> > +};
> > +
> > +&usbphy2 {
> > +       tx-d-cal = <0x5>;
>
> Ditto.