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

[Alban]

On Mon, 07 Sep 2015 15:20:42 +0200
Arnd Bergmann <arnd@xxxxxxxx> 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.

Alban
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