linux-kernel - Re: [PATCH RFC 1/4] phy: Add new Exynos5 USB 3.0 PHY driver

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Date:	Mon, 04 Nov 2013 13:26:44 +0100
From:	Tomasz Figa <t.figa@...sung.com>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Vivek Gautam <gautam.vivek@...sung.com>, linux-usb@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, gregkh@...uxfoundation.org,
	kgene.kim@...sung.com, k.debski@...sung.com,
	s.nawrocki@...sung.com, balbi@...com, jwerner@...omium.org,
	jg1.han@...sung.com
Subject: Re: [PATCH RFC 1/4] phy: Add new Exynos5 USB 3.0 PHY driver

Hi Kishon,

On Monday 04 of November 2013 12:24:42 Kishon Vijay Abraham I wrote:
> Hi Vivek,
> 
> On Thursday 31 October 2013 01:15 PM, Vivek Gautam wrote:
> > Add a new driver for the USB 3.0 PHY on Exynos5 series of SoCs.
> > The new driver uses the generic PHY framework and will interact
> > with DWC3 controller present on Exynos5 series of SoCs.
> 
> In Exynos, you have a single IP that supports both USB3 and USB2 PHY 
> right? I think that needs to be mentioned here.

Nope. There are two separate, different IPs.

> Do you have separate registers that should be used for 
> initializing/powerin_on/powering_off etc.. for usb2 phy and usb3 phy? If 
> so, then you should model this driver as a single driver that supports 
> two PHYs similar to what Sylwester has done before?

Sylwester's MIPI PHY uses such model because it has a single register
that controls both PHYs.

Best regards,
Tomasz

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