linux-kernel - Re: [PATCH v2 12/13] ARM: dts: imx: add i.MXRT1050-EVK support

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Date:   Tue, 2 Nov 2021 20:42:31 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Jesse Taube <mr.bossman075@...il.com>
Cc:     NXP Linux Team <linux-imx@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Dong Aisheng <aisheng.dong@....com>,
        Stefan Agner <stefan@...er.ch>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, Russell King - ARM Linux <linux@...linux.org.uk>,
        Abel Vesa <abel.vesa@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Giulio Benetti <giulio.benetti@...ettiengineering.com>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        linux-clk <linux-clk@...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>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v2 12/13] ARM: dts: imx: add i.MXRT1050-EVK support

On Tue, Nov 2, 2021 at 7:57 PM Jesse Taube <mr.bossman075@...il.com> wrote:

> +/ {
> +       model = "NXP IMXRT1050-evk board";
> +       compatible = "fsl,imxrt1050-evk", "fsl,imxrt1050";
> +
> +       chosen {
> +               bootargs = "root=/dev/ram";

No need to pass bootargs here.

> +               stdout-path = &lpuart1;
> +       };
> +
> +       aliases {
> +               gpio0 = &gpio1;
> +               gpio1 = &gpio2;
> +               gpio2 = &gpio3;
> +               gpio3 = &gpio4;
> +               gpio4 = &gpio5;
> +               mmc0 = &usdhc1;
> +               serial0 = &lpuart1;
> +       };
> +
> +       memory@0 {

memory@...00000

Building with W=1 should give a dtc warning due to the unit address
and reg mismatch.

> +               device_type = "memory";
> +               reg = <0x80000000 0x2000000>;
> +       };
> +

Unneeded blank line.
> +
> +&iomuxc {
> +       pinctrl-names = "default";
> +
> +       imxrt1050-evk {

No need for this imxrt1050-evk container.

> +               pinctrl_lpuart1: lpuart1grp {
> +                       fsl,pins = <
> +                               MXRT1050_IOMUXC_GPIO_AD_B0_12_LPUART1_TXD
> +                                       0xf1

Put it on a single line. It helps readability. Same applies globally.
> +&usdhc1 {
> +       pinctrl-names = "default", "state_100mhz", "state_200mhz", "sleep";
> +       pinctrl-0 = <&pinctrl_usdhc0>;
> +       pinctrl-1 = <&pinctrl_usdhc0>;
> +       pinctrl-2 = <&pinctrl_usdhc0>;
> +       pinctrl-3 = <&pinctrl_usdhc0>;
> +       status = "okay";
> +
> +       cd-gpios = <&gpio2 28 GPIO_ACTIVE_LOW>;

Make 'status' to be the last property. Remove the blank line.

> +               edma1: dma-controller@...e8000 {
> +                       #dma-cells = <2>;
> +                       compatible = "fsl,imx7ulp-edma";
> +                       reg = <0x400e8000 0x4000>,
> +                               <0x400ec000 0x4000>;
> +                       dma-channels = <32>;
> +                       interrupts = <0>,
> +                               <1>,
> +                               <2>,
> +                               <3>,
> +                               <4>,
> +                               <5>,
> +                               <6>,
> +                               <7>,
> +                               <8>,
> +                               <9>,
> +                               <10>,
> +                               <11>,
> +                               <12>,
> +                               <13>,
> +                               <14>,
> +                               <15>,
> +                               <16>;

Please group more elements into the same line.

Putting one entry per line makes it extremely long.

> +               gpio5: gpio@...c0000 {
> +                       compatible = "fsl,imxrt-gpio", "fsl,imx35-gpio";
> +                       reg = <0x400c0000 0x4000>;
> +                       interrupts = <88>,
> +                               <89>;

Put the interrupts into a single line.