linux-kernel - Re: [PATCH] arm64: dts: ulcb-kf: Add support for TI WL1837

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Message-ID: <CAMuHMdVfDd_1gHnX=WvkHnF33fG2sWy7F5bTh-DghoKSt-vLCA@mail.gmail.com>
Date:   Tue, 28 May 2019 11:19:04 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Spyridon Papageorgiou <spapageorgiou@...adit-jv.com>
Cc:     Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Tobias Franzen <tfranzen@...adit-jv.com>,
        Biju Das <biju.das@...renesas.com>
Subject: Re: [PATCH] arm64: dts: ulcb-kf: Add support for TI WL1837

Hi Spyridon,

On Thu, Apr 11, 2019 at 2:42 PM Spyridon Papageorgiou
<spapageorgiou@...adit-jv.com> wrote:
> This patch adds description of TI WL1837 and links interfaces
> to communicate with the IC, namely the SDIO interface to WLAN.
>
> Signed-off-by: Spyridon Papageorgiou <spapageorgiou@...adit-jv.com>

Thanks for your patch!

> --- a/arch/arm64/boot/dts/renesas/ulcb-kf.dtsi
> +++ b/arch/arm64/boot/dts/renesas/ulcb-kf.dtsi
> @@ -38,6 +38,18 @@
>                 regulator-min-microvolt = <5000000>;
>                 regulator-max-microvolt = <5000000>;
>         };
> +
> +       wlan_en: regulator-wlan_en {
> +               compatible = "regulator-fixed";
> +               regulator-name = "wlan-en-regulator";
> +
> +               regulator-min-microvolt = <3300000>;
> +               regulator-max-microvolt = <3300000>;

So this is a 3.3V regulator...

> +
> +               gpio = <&gpio_exp_74 4 GPIO_ACTIVE_HIGH>;
> +               startup-delay-us = <70000>;
> +               enable-active-high;
> +       };
>  };
>
>  &can0 {

> @@ -273,6 +298,30 @@
>         status = "okay";
>  };
>
> +&sdhi3 {
> +       pinctrl-0 = <&sdhi3_pins>;
> +       pinctrl-names = "default";
> +
> +       vmmc-supply = <&wlan_en>;
> +       vqmmc-supply = <&wlan_en>;

... used for both card and I/O line power...

> +       bus-width = <4>;
> +       no-1-8-v;

... hence no 1.8V I/O.

However, VIO of WL1837 is provided by W1.8V of regulator U55,
which is 1.8V?

> +       non-removable;
> +       cap-power-off-card;
> +       keep-power-in-suspend;
> +       max-frequency = <26000000>;
> +       status = "okay";
> +
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +       wlcore: wlcore@2 {
> +               compatible = "ti,wl1837";
> +               reg = <2>;
> +               interrupt-parent = <&gpio1>;
> +               interrupts = <25 IRQ_TYPE_EDGE_FALLING>;

I'm also a bit puzzled by the interrupt type.
On Cat 874, it's IRQ_TYPE_LEVEL_HIGH, cfr.
https://lore.kernel.org/linux-renesas-soc/1557997166-63351-2-git-send-email-biju.das@bp.renesas.com/

On Kingfisher, the IRQ signal is inverted by U104, so I'd expect
IRQ_TYPE_LEVEL_LOW instead of IRQ_TYPE_EDGE_FALLING?

Apart from the above two comments:
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds