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

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  Re: [PATCH v2 11/11] arm64: allwinner: a64: enable Wi-Fi for Pine64 Andreas Färber <afaerber@suse.de> - 2017-04-14 19:00 +0200
    Re: [PATCH v2 11/11] arm64: allwinner: a64: enable Wi-Fi for Pine64 Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-04-17 10:00 +0200

#1623780 — Re: [PATCH v2 11/11] arm64: allwinner: a64: enable Wi-Fi for Pine64

Hi,

Am 07.04.2017 um 20:34 schrieb Icenowy Zheng:
> The Wi-Fi modules of Pine64 is powered via DLDO4 and ELDO1 (the latter

"modules ... are" or "module ... is"

> one provides I/O voltage).
> 
> Add device node for it.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.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.

> +
>  &ohci1 {
>  	status = "okay";
>  };

Regards,
Andreas

-- 
SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)

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#1624588

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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@aosc.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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