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

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Date:   Wed, 21 Apr 2021 11:40:26 +0800
From:   dillon min <dillon.minfei@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Krzysztof Kozlowski <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,
        Sascha Hauer <s.hauer@...gutronix.de>, kernel@...gutronix.de,
        prabhakar.csengg@...il.com, mchehab@...nel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <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 Fabio,

Thanks for quick reply.

On Tue, Apr 20, 2021 at 10:27 PM Fabio Estevam <festevam@...il.com> wrote:
>
> 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.
Agree, thanks.
>
> > +&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
Agree, thanks.
>
> > +&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.
Agree, after moving these pinctrl to corresponding component's group,
the hoggrp is useless.
so, I removed it in v4.
>
> > +&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.
Agree, thanks.