linux-kernel - Re: [PATCH v3 2/2] ARM: at91/dt: sama5d2: Use new compatible for ohci node

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Message-ID: <20160608103300.GE2466@piout.net>
Date:	Wed, 8 Jun 2016 12:33:00 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Wenyou Yang <wenyou.yang@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Brown <broonie@...nel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 2/2] ARM: at91/dt: sama5d2: Use new compatible for
 ohci node

On 08/06/2016 at 12:06:11 +0200, Nicolas Ferre wrote :
> Le 08/06/2016 06:15, Wenyou Yang a écrit :
> > Use compatible "atmel,sama5d2-ohci" to be capable of suspending
> > ports while sleep to save the power consumption.
> > 
> > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > ---
> > 
> > Changes in v3: None
> > Changes in v2:
> >  - Use the new compatible for ohci-node.
> > 
> >  arch/arm/boot/dts/sama5d2.dtsi | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm/boot/dts/sama5d2.dtsi b/arch/arm/boot/dts/sama5d2.dtsi
> > index 78996bd..03d6724 100644
> > --- a/arch/arm/boot/dts/sama5d2.dtsi
> > +++ b/arch/arm/boot/dts/sama5d2.dtsi
> > @@ -232,7 +232,7 @@
> >  		};
> >  
> >  		usb1: ohci@...00000 {
> > -			compatible = "atmel,at91rm9200-ohci", "usb-ohci";
> > +			compatible = "atmel,sama5d2-ohci", "usb-ohci";
> 
> We must change this to:
> +			compatible = "atmel,sama5d2-ohci", "atmel,at91rm9200-ohci", "usb-ohci";
> 
> To make it independent from the one that may reach Mainline through the USB git tree.
> 

Well, like discussed, I'd say that a new compatible is not needed as we
already know on which chip we are running depending on the SFR that we
can lookup. My concern was only to avoid calling a function
unnecessarily on !sama5d2 platforms.
> 
> >  			reg = <0x00400000 0x100000>;
> >  			interrupts = <41 IRQ_TYPE_LEVEL_HIGH 2>;
> >  			clocks = <&uhphs_clk>, <&uhphs_clk>, <&uhpck>;
> > 
> 
> Bye,
> -- 
> Nicolas Ferre

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com