linux-kernel - Re: [PATCH v3 3/4] arm: dts: imx: Add i.mx6q DaSheng COM-9XX SBC board support

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Date:   Tue, 20 Apr 2021 11:27:05 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     dillon.minfei@...il.com
Cc:     krzysztof.kozlowski@...onical.com,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Stefan Riedmueller <s.riedmueller@...tec.de>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        leoyang.li@....com, arnd@...db.de, olof@...om.net,
        s.hauer@...gutronix.de, kernel@...gutronix.de,
        prabhakar.csengg@...il.com, mchehab@...nel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v3 3/4] arm: dts: imx: Add i.mx6q DaSheng COM-9XX SBC
 board support

Hi Dillon,

On Thu, Apr 15, 2021 at 1:05 AM <dillon.minfei@...il.com> wrote:

> +               green {
> +                       gpios = <&gpio4 8 0>;

Please use GPIO_ACTIVE_HIGH label instead:
gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>;

> +&clks {
> +       assigned-clocks = <&clks IMX6QDL_CLK_LDB_DI0_SEL>,
> +                         <&clks IMX6QDL_CLK_LDB_DI1_SEL>;
> +       assigned-clock-parents = <&clks IMX6QDL_CLK_PLL3_USB_OTG>,
> +                                <&clks IMX6QDL_CLK_PLL3_USB_OTG>;
> +};

You are setting the LDB clock parent, but you don't use LDB in this
devicetree. You could simply remove this.

> +&ecspi1 {
> +       cs-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>;
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&pinctrl_ecspi1>;
> +       status = "okay";
> +
> +       flash: m25p80@0 {

Node names should be generic:

m25p80: flash@0

> +&iomuxc {
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&pinctrl_hog>;
> +
> +       imx6qdl-ds {
> +               pinctrl_hog: hoggrp {
> +                       fsl,pins = <
> +                               MX6QDL_PAD_NANDF_D0__GPIO2_IO00 0x1b0b0
> +                               MX6QDL_PAD_NANDF_D1__GPIO2_IO01 0x1b0b0
> +                               MX6QDL_PAD_GPIO_0__CCM_CLKO1    0x130b0

This could be part of the pinctrl_ov2659 group as it provides the
clock for the camera.

Please try to keep in the hoggrp only the pins that cannot be
controlled by any other node.

> +&wdog1 {
> +       status = "okay";
> +};
> +
> +&wdog2 {
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&pinctrl_wdog>;
> +       fsl,ext-reset-output;
> +       status = "disabled";

Wouldn't it be better to enable wdog2 and disable wdog1 instead? wdog2
provides a POR, which is preferred.