linux-kernel - Re: [PATCH v1 3/5] phy: pci serdes phy driver for keystone

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Message-ID: <9828919.7tZBgbvqj4@wuerfel>
Date:	Fri, 23 May 2014 21:23:11 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Murali Karicheri <m-karicheri2@...com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Jingoo Han <jg1.han@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mohit Kumar <mohit.kumar@...com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v1 3/5] phy: pci serdes phy driver for keystone

On Friday 23 May 2014 13:14:00 Murali Karicheri wrote:
> On 5/15/2014 12:14 PM, Arnd Bergmann wrote:
> > On Thursday 15 May 2014 12:01:30 Murali Karicheri wrote:
> >> +static struct serdes_config ks_100mhz_pcie_5gbps_serdes[] = {
> >> +       {0x0000, 0x00000800, 0x0000ff00},
> >> +       {0x0060, 0x00041c5c, 0x00ffffff},
> >> +       {0x0064, 0x0343c700, 0xffffff00},
> >> +       {0x006c, 0x00000012, 0x000000ff},
> >> +       {0x0068, 0x00070000, 0x00ff0000},
> >> +       {0x0078, 0x0000c000, 0x0000ff00},
> > It looks like the PHY is generic, but the configuration above is
> > PCI specific. If this is true, you should have #phy-cells=<1>
> > and document the possible modes, adding a lookup table here to
> > pick the configuration based on the argument. It's fine to just
> > implement pcie-5ghz initially, but the binding should list all
> > the modes that the PHY can support.
> 
> The PCIE name needs to be dropped and as you correctly guessed, this SERDES
> is generic.

Ok, good.

> > Also, please list the exact name of the phy if you can find it
> > out. You mention that you don't know the register descriptions,
> > but you should at least be able to let us know what phy this
> > is, in case some other SoC reuses the same thing.
>
> Unfortunately there is a NDA restriction that prevents us from using the
> actual Phy name and keystone phy is the name what we can usel at the 
> moment. I am checking
> this with our IP team and if original name can  be used, I will update 
> the driver to reflect the same.

Can you please check the phy drivers that we already have in linux-next
to see if any of those are for the same hardware then?

I guess it's our best hope to catch duplications by inspecting all
other phy drivers as they get merged then.

	Arnd
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