linux-kernel - Re: [PATCH v2 11/11] arm64: allwinner: a64: enable Wi-Fi for Pine64

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Message-ID: <20170417075921.vrjchymctxidtp7l@lukather>
Date:   Mon, 17 Apr 2017 09:59:21 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Andreas Färber <afaerber@...e.de>
Cc:     Icenowy Zheng <icenowy@...c.io>, Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 11/11] arm64: allwinner: a64: enable Wi-Fi for Pine64

On Fri, Apr 14, 2017 at 06:56:16PM +0200, Andreas Färber wrote:
> > one provides I/O voltage).
> > 
> > Add device node for it.
> > 
> > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > ---
> >  arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts
> > index 7da074f95065..9d90bb32aa87 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts
> > @@ -64,6 +64,11 @@
> >  		regulator-min-microvolt = <3300000>;
> >  		regulator-max-microvolt = <3300000>;
> >  	};
> > +
> > +	wifi_pwrseq: wifi_pwrseq {
> > +		compatible = "mmc-pwrseq-simple";
> > +		reset-gpios = <&r_pio 0 2 GPIO_ACTIVE_LOW>; /* PL2 */
> > +	};
> >  };
> >  
> >  &ehci1 {
> > @@ -91,6 +96,17 @@
> >  	status = "okay";
> >  };
> >  
> > +&mmc1 {
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&mmc1_pins>;
> > +	vmmc-supply = <&reg_dldo4>;
> > +	vqmmc-supply = <&reg_eldo1>;
> > +	mmc-pwrseq = <&wifi_pwrseq>;
> > +	non-removable;
> > +	bus-width = <4>;
> > +	status = "okay";
> > +};
> 
> As you mention above, Wi-Fi is a module, so may be absent. Is it really
> correct to enable this node and hardcode a certain power sequence? In
> theory other modules could be attached.
> 
> To me that calls for an overlay instead.

Agreed.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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