linux-kernel - Re: [PATCH v3 08/12] Documentation: bindings: add doc for the USB2 ChipIdea USB driver

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Message-ID: <20140716085924.GA28151@kwain>
Date:	Wed, 16 Jul 2014 10:59:24 +0200
From:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>,
	sebastian.hesselbarth@...il.com, Peter.Chen@...escale.com,
	balbi@...com, p.zabel@...gutronix.de,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, alexandre.belloni@...e-electrons.com,
	jszhang@...vell.com
Subject: Re: [PATCH v3 08/12] Documentation: bindings: add doc for the USB2
 ChipIdea USB driver

Hi Arnd,

On Wed, Jul 16, 2014 at 10:39:36AM +0200, Arnd Bergmann wrote:
> On Wednesday 16 July 2014 10:26:02 Antoine Ténart wrote:
> > +
> > +Required properties:
> > +- compatible: should be "chipidea,usb2"
> > +- reg: base address and length of the registers
> > +- interrupts: interrupt for the USB controller
> > +
> > +Optional properties:
> > +- clocks: reference to the USB clock
> > +- usb-phy: reference to the USB PHY
> 
> I think the phy reference should use the standard phy binding, using
> "phys" property to refer to a node that has a "#phy-cells" property.
> 
> It seems the code gets this right, but just the documentation is wrong.

I moved this PHY driver from usb/phy/ to phy/ and forgot to update this
property. I'll fix it.

> 
> > +- vbus-supply: reference to the VBUS regulator
> > +- dma-mask: DMA bit mask
> 
> No. Do not use "dma-mask" as a property, that is a pure Linux specific
> concept. The DT way to express this is to use the 'dma-ranges' property
> in the device's parent to describe any bus-related restrictions, and
> for the driver to ask for a mask that matches what the hardware is
> capable of (which may be smaller or larger than what the bus supports).

Ok. I'll answer in the CI driver's thread.

Thanks!

Antoine

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