linux-kernel - Re: [PATCH 0/4] MIPS: ath79: Add USB support on the TL-WR1043ND

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Date:	Wed, 09 Sep 2015 16:21:13 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Alban <albeu@...e.fr>
Cc:	linux-mips@...ux-mips.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] MIPS: ath79: Add USB support on the TL-WR1043ND

On Wednesday 09 September 2015 16:14:59 Alban wrote:
> On Mon, 07 Sep 2015 15:20:42 +0200
> Arnd Bergmann <arnd@...db.de> wrote:
> 
> > On Tuesday 01 September 2015 17:23:10 Alban Bedel wrote:
> > > 
> > > this serie add a driver for the USB phy on the ATH79 SoCs and enable the
> > > USB port on the TL-WR1043ND. The phy controller is really trivial as it
> > > only use reset lines.
> > > 
> > 
> > Is this a common thing to have? If other PHY devices are like this, we
> > could instead add a simple generic PHY driver that just asserts all
> > its reset lines in the order as provided, rather than making this a
> > hardware specific driver that ends up getting copied several times.
> 
> I don't know how common it is. However I agree that a simple driver that
> can start a clock and toggle a few GPIO and/or reset would make sense.
> 
> However in the case of the ATH79 SoC some models have a reset line that
> is misused to force the PHY in sleep mode. Sadly this extra reset must
> be asserted for the PHY to work, so it wouldn't fit in such a generic
> design.
> 
> Still we could have such a generic driver and let the ATH79 driver
> build on top of it. Honestly that's what I wanted to do, but getting
> generic drivers with DT support accepted is not easy. That's why I went
> with this driver, it is technically inferior but much easier to get
> considered for merging.

Ok, fair enough. If we end up doing a more generic driver for this,
we can still consider adding the compatible string there, potentially
with some workaround for the sleep mode.

	Arnd
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