linux-kernel - Re: [PATCH 3/3] ARM: dts: imx28: Add DTS description of imx28 based XEA board

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Message-ID: <CAOMZO5AkSZf3p7n1UdE9HXPcVciBATH1k5mZLCoNKZ6o2M8maQ@mail.gmail.com>
Date:   Tue, 22 Dec 2020 14:58:27 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Rob Herring <robh+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>,
        "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>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ARM: dts: imx28: Add DTS description of imx28 based
 XEA board

Hi Lukasz,

On Wed, Nov 25, 2020 at 1:19 PM Lukasz Majewski <lukma@...x.de> wrote:

> diff --git a/arch/arm/boot/dts/imx28-lwe.dtsi b/arch/arm/boot/dts/imx28-lwe.dtsi
> new file mode 100644
> index 000000000000..cb2eb4377d9c
> --- /dev/null
> +++ b/arch/arm/boot/dts/imx28-lwe.dtsi
> @@ -0,0 +1,185 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
> +/*
> + * Copyright 2020
> + * Lukasz Majewski, DENX Software Engineering, lukma@...x.de
> + */
> +
> +/dts-v1/;
> +#include "imx28.dtsi"
> +
> +/ {
> +       compatible = "fsl,imx28";

You can drop this one.

> +
> +       aliases {
> +               spi2 = &ssp3;
> +       };
> +
> +       chosen {
> +               bootargs = "root=/dev/mmcblk0p2 rootfstype=ext4 ro rootwait console=ttyAMA0,115200 panic=1";

You could remove bootargs and let the bootloader pass it.

We usually don't pass bootargs in the i.MX dts files.

> +       };
> +
> +       memory {

memory@...00000

otherwise you will get dtc build warnings with W=1.

> +               reg = <0x40000000 0x08000000>;
> +       };
> +
> +       regulators {
> +               compatible = "simple-bus";
> +               #address-cells = <1>;
> +               #size-cells = <0>;

No need for this 'regulators' container.

> +
> +               reg_3v3: regulator@0 {

reg_3v3: regulator-reg-3v3 {

> +                       compatible = "regulator-fixed";
> +                       reg = <0>;

Remove the reg = <0>

Same applies to other regulators.

> +               reg_usb_5v: regulator@1 {
> +                       compatible = "regulator-fixed";
> +                       reg = <1>;
> +                       regulator-name = "usb_vbus";
> +                       regulator-min-microvolt = <5000000>;
> +                       regulator-max-microvolt = <5000000>;
> +                       enable-active-high;

Why passing 'enable-active-high' when this is not gpio controlled?

> +               };
> +
> +               reg_fec_3v3: regulator@2 {
> +                       compatible = "regulator-fixed";
> +                       reg = <2>;
> +                       regulator-name = "fec-phy";
> +                       regulator-min-microvolt = <3300000>;
> +                       regulator-max-microvolt = <3300000>;
> +                       enable-active-high;

Same here.

> +&ssp3 {
> +       compatible = "fsl,imx28-spi";
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&spi3_pins_a>;
> +       status = "okay";
> +
> +       flash0: s25fl256s0@0 {

Node names should be generic

flash@0
> +
> +/dts-v1/;
> +#include "imx28-lwe.dtsi"
> +
> +/ {
> +       model = "XEA";

compatible = "xea,imx20-lwe", "fsl,imx28";

You should add xea to the vendor prefix in a separate patch.

You also need to add thie board to
Documentation/devicetree/bindings/arm/fsl.yaml