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

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Date:   Fri, 31 May 2019 11:37:02 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Spyridon Papageorgiou <spapageorgiou@...adit-jv.com>,
        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,

please respond to Geert's review below and
if appropriate provide an incremental patch.

Thanks in advance,
Simon

On Tue, May 28, 2019 at 11:19:04AM +0200, Geert Uytterhoeven wrote:
> 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
>