linux-kernel - Re: [PATCH v3] ARM: dts: imx7d-remarkable2: Add WiFi support

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Date:   Thu, 8 Jul 2021 19:16:00 +1000
From:   Alistair Francis <alistair23@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Alistair Francis <alistair@...stair23.me>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ARM: dts: imx7d-remarkable2: Add WiFi support

On Tue, Jul 6, 2021 at 10:29 PM Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Alistair,
>
> On Tue, Jul 6, 2021 at 8:40 AM Alistair Francis <alistair@...stair23.me> wrote:
>
> > +       wifi_pwrseq: wifi_pwrseq {
> > +               compatible = "mmc-pwrseq-simple";
> > +               pinctrl-names = "default";
> > +               pinctrl-0 = <&pinctrl_wifi>;
> > +               reset-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>;
> > +               clocks = <&clks IMX7D_CLKO2_ROOT_DIV>;
>
> Don't you need to select the osc32 as the parent clock?
>
> This is what we do on arch/arm/boot/dts/imx7d-pico.dtsi and
> arch/arm/boot/dts/imx7d-nitrogen7.dts:
>
> &clks {
> assigned-clocks = <&clks IMX7D_CLKO2_ROOT_SRC>,
>   <&clks IMX7D_CLKO2_ROOT_DIV>;
> assigned-clock-parents = <&clks IMX7D_CKIL>;
> assigned-clock-rates = <0>, <32768>;
> };

I'm not sure I follow, we do the same thing here with:

&clks {
    assigned-clocks = <&clks IMX7D_CLKO2_ROOT_SRC>,
              <&clks IMX7D_CLKO2_ROOT_DIV>;
    assigned-clock-parents = <&clks IMX7D_CKIL>;
    assigned-clock-rates = <0>, <32768>;
};

Alistair