From: Vladimir Oltean <olteanv@gmail.com>
To: "Marek Behún" <kabel@kernel.org>
Cc: Holger Brunck <holger.brunck@hitachienergy.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>
Subject: Re: [v3 2/2] dsa: mv88e6xxx: make serdes SGMII/Fiber output amplitude configurable
Date: Wed, 8 Dec 2021 19:20:50 +0200 [thread overview]
Message-ID: <20211208172050.5pxekymkgwgqm3hb@skbuf> (raw)
In-Reply-To: <20211208181009.3cc65cec@thinkpad>
On Wed, Dec 08, 2021 at 06:10:09PM +0100, Marek Behún wrote:
> > > Yes, the pair
> > > serdes-tx-amplitude-millivolt
> > > serdes-tx-amplitude-millivolt-names
> > > is the best.
> > >
> > > If the second is not defined, the first should contain only one value,
> > > and that is used as default.
> > >
> > > If multiple values are defined, but "default" is not, the driver should
> > > set default value as the default value of the corresponding register.
> > >
> > > The only remaining question is this: I need to implement this also for
> > > comphy driver. In this case, the properties should be defined in the
> > > comphy node, not in the MAC node. But the comphy also supports PCIe,
> > > USB3 and SATA modes. We don't have strings for them. So this will need
> > > to be extended in the future.
> > >
> > > But for now this proposal seems most legit. I think the properties
> > > should be defined in common PHY bindings, and other bindings should
> > > refer to them via $ref.
> >
> > I wouldn't $ref the tx-amplitude-millivolt-names from the phy-mode,
> > because (a) not all phy-mode values are valid (think of parallel interfaces
> > like rgmii) and (b) because sata, pcie, usb are also valid SERDES
> > protocols as you point out. With the risk of a bit of duplication, I
> > think I'd keep the SERDES protocol names a separate thing for the YAML
> > validator.
>
> Not what I meant. What I meant was that the tx-amplitude-millivolt*
> properties should be defined in binding for common PHY (not network PHY)
> Documentation/devicetree/bindings/phy/phy-bindings.txt,
> and then the mv88e6xxx binding should refer it's
> tx-amplitude-millivolt* properties from there.
>
> And the definition in common PHY binding should list all modes in an
> enum, containing all network SerDes modes, plus the other modes like
> PCIe, USB3, DisplayPort, LVDS, SATA, ...
Sorry, I misunderstood what you meant by "common PHY bindings", thanks
for clarifying. Yes, Documentation/devicetree/bindings/phy/phy-bindings.txt
seems like the place, after being converted to YAML.
next prev parent reply other threads:[~2021-12-08 17:20 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 19:07 [v3 1/2] Docs/devicetree: add serdes.yaml Holger Brunck
2021-12-07 19:07 ` [v3 2/2] dsa: mv88e6xxx: make serdes SGMII/Fiber output amplitude configurable Holger Brunck
2021-12-07 19:27 ` Marek Behún
2021-12-08 12:29 ` Holger Brunck
2021-12-08 15:28 ` Marek Behún
2021-12-08 15:49 ` Holger Brunck
2021-12-08 16:17 ` Marek Behún
2021-12-08 16:21 ` Marek Behún
2021-12-08 16:41 ` Vladimir Oltean
2021-12-08 16:49 ` Vladimir Oltean
2021-12-08 17:00 ` Marek Behún
2021-12-08 17:19 ` Vladimir Oltean
2021-12-08 17:36 ` Marek Behún
2021-12-08 17:55 ` Andrew Lunn
2021-12-08 18:15 ` Marek Behún
2021-12-08 16:51 ` Marek Behún
2021-12-08 16:59 ` Vladimir Oltean
2021-12-08 17:10 ` Marek Behún
2021-12-08 17:12 ` Marek Behún
2021-12-08 17:20 ` Vladimir Oltean [this message]
2021-12-08 17:00 ` Andrew Lunn
2021-12-08 17:16 ` Marek Behún
2021-12-15 10:27 ` Holger Brunck
2021-12-15 20:53 ` Marek Behún
2022-01-20 7:52 ` Holger Brunck
2022-01-20 17:57 ` Marek Behún
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