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From: Oleksij Rempel <o.rempel@pengutronix.de>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	linux-kernel@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	netdev@vger.kernel.org, Marek Vasut <marex@denx.de>,
	David Jander <david@protonic.nl>,
	devicetree@vger.kernel.org
Subject: Re: [PATCH v4 1/4] dt-bindings: net: phy: Add support for NXP TJA11xx
Date: Fri, 13 Mar 2020 19:16:01 +0100	[thread overview]
Message-ID: <20200313181601.sbxdrqdjqfj3xn3e@pengutronix.de> (raw)
In-Reply-To: <20200313181056.GA29732@lunn.ch>

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On Fri, Mar 13, 2020 at 07:10:56PM +0100, Andrew Lunn wrote:
> > > diff --git a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> > > new file mode 100644
> > > index 000000000000..42be0255512b
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> > > @@ -0,0 +1,61 @@
> > > +# SPDX-License-Identifier: GPL-2.0+
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/net/nxp,tja11xx.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: NXP TJA11xx PHY
> > > +
> > > +maintainers:
> > > +  - Andrew Lunn <andrew@lunn.ch>
> > > +  - Florian Fainelli <f.fainelli@gmail.com>
> > > +  - Heiner Kallweit <hkallweit1@gmail.com>
> > > +
> > > +description:
> > > +  Bindings for NXP TJA11xx automotive PHYs
> > > +
> > > +allOf:
> > > +  - $ref: ethernet-phy.yaml#
> > > +
> > > +patternProperties:
> > > +  "^ethernet-phy@[0-9a-f]+$":
> > > +    type: object
> > > +    description: |
> > > +      Some packages have multiple PHYs. Secondary PHY should be defines as
> > > +      subnode of the first (parent) PHY.
> > 
> > 
> > There are QSGMII PHYs which have 4 PHYs embedded and AFAICT they are
> > defined as 4 separate Ethernet PHY nodes and this would not be quite a
> > big stretch to represent them that way compared to how they are.
> > 
> > I would recommend doing the same thing and not bend the MDIO framework
> > to support the registration of "nested" Ethernet PHY nodes.
> 
> Hi Florian
> 
> The issue here is the missing PHY ID in the secondary PHY. Because of
> that, the secondary does not probe in the normal way. We need the
> primary to be involved to some degree. It needs to register it. What
> i'm not so clear on is if it just needs to register it, or if these
> sub nodes are actually needed, given the current code.

There are a bit more dependencies:
- PHY0 is responsible for health monitoring. If some thing wrong, it may
  shut down complete chip.
- We have shared reset. It make no sense to probe PHY1 before PHY0 with
  more controlling options will be probed
- It is possible bat dangerous to use PHY1 without PHY0.

Regards,
Oleksij

-- 
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  reply	other threads:[~2020-03-13 18:16 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13  5:22 [PATCH v4 0/4] add TJA1102 support Oleksij Rempel
2020-03-13  5:22 ` [PATCH v4 1/4] dt-bindings: net: phy: Add support for NXP TJA11xx Oleksij Rempel
2020-03-13 18:02   ` Florian Fainelli
2020-03-13 18:10     ` Andrew Lunn
2020-03-13 18:16       ` Oleksij Rempel [this message]
2020-03-13 18:20         ` Florian Fainelli
2020-03-13 18:53           ` Oleksij Rempel
2020-03-17 11:56             ` Oleksij Rempel
2020-03-17 19:48               ` Florian Fainelli
2020-03-20 23:05                 ` Rob Herring
2020-03-22 21:09                   ` Florian Fainelli
2020-03-23 14:20                     ` Rob Herring
2020-04-28 17:30   ` Rob Herring
2020-04-29  4:38     ` Oleksij Rempel
2020-04-29  4:45       ` Florian Fainelli
2020-03-13  5:22 ` [PATCH v4 2/4] net: phy: tja11xx: add initial TJA1102 support Oleksij Rempel
2020-03-13  5:22 ` [PATCH v4 3/4] net: mdio: of: export part of of_mdiobus_register_phy() Oleksij Rempel
2020-03-13  5:22 ` [PATCH v4 4/4] net: phy: tja11xx: add delayed registration of TJA1102 PHY1 Oleksij Rempel
2020-03-16  8:44 ` [PATCH v4 0/4] add TJA1102 support David Miller

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