linux-kernel - [PATCH net-next 0/9] XPCS polarity inversion via generic device tree properties

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Message-Id: <20251122193341.332324-1-vladimir.oltean@nxp.com>
Date: Sat, 22 Nov 2025 21:33:32 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-phy@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Daniel Golle <daniel@...rotopia.org>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Eric Woudstra <ericwouds@...il.com>,
	Marek Behún <kabel@...nel.org>,
	Lee Jones <lee@...nel.org>,
	Patrice Chotard <patrice.chotard@...s.st.com>
Subject: [PATCH net-next 0/9] XPCS polarity inversion via generic device tree properties

Polarity inversion (described in patch 3/6) is a feature with at least 3
potential new users waiting for a generic description:
- Horatiu Vultur with the lan966x SerDes
- Daniel Golle with the MaxLinear GSW1xx switches
- Me with a custom SJA1105 board, switch which uses the DesignWare XPCS

I became interested in exploring the problem space because I was averse
to the idea of adding vendor-specific device tree properties to describe
a common need.

This set contains an implementation of a generic feature that should
cater to all known needs that were identified during my documentation
phase. I've added a new user - the XPCS - and I've converted an existing
user - the EN8811H Ethernet PHY.

I haven't converted the rest due to various reasons:
- "mediatek,pnswap" is defined bidirectionally and the underlying
  SGMII_PN_SWAP_TX_RX register field doesn't make it clear which bit is
  RX and which is TX. Needs more work and expert knowledge from maintainer.
- "st,px_rx_pol_inv" - its binding is a .txt file and I don't have time
  for such a large detour to convert it to dtschema.
- "st,pcie-tx-pol-inv" and "st,sata-tx-pol-inv" - these are defined in a
  .txt schema but are not implemented in any driver. My verdict would be
  "delete the properties" but again, I would prefer not introducing such
  dependency to this series.

Vladimir Oltean (9):
  dt-bindings: phy: rename transmit-amplitude.yaml to
    phy-common-props.yaml
  dt-bindings: phy-common-props: create a reusable "protocol-names"
    definition
  dt-bindings: phy-common-props: RX and TX lane polarity inversion
  dt-bindings: net: xpcs: allow properties from phy-common-props.yaml
  phy: add phy_get_rx_polarity() and phy_get_tx_polarity()
  net: pcs: xpcs: promote SJA1105 TX polarity inversion to core
  net: pcs: xpcs: allow lane polarity inversion
  net: phy: air_en8811h: deprecate "airoha,pnswap-rx" and
    "airoha,pnswap-tx"
  dt-bindings: net: airoha,en8811h: deprecate "airoha,pnswap-rx" and
    "airoha,pnswap-tx"

 .../bindings/net/airoha,en8811h.yaml          |  11 +-
 .../bindings/net/pcs/snps,dw-xpcs.yaml        |   5 +-
 .../bindings/phy/phy-common-props.yaml        | 152 ++++++++++++++++++
 .../bindings/phy/transmit-amplitude.yaml      | 103 ------------
 MAINTAINERS                                   |  21 +++
 drivers/net/pcs/Kconfig                       |   1 +
 drivers/net/pcs/pcs-xpcs-nxp.c                |  11 --
 drivers/net/pcs/pcs-xpcs.c                    |  58 ++++++-
 drivers/net/pcs/pcs-xpcs.h                    |   2 +-
 drivers/net/phy/Kconfig                       |   1 +
 drivers/net/phy/air_en8811h.c                 |  50 ++++--
 drivers/phy/Kconfig                           |   9 ++
 drivers/phy/Makefile                          |   1 +
 drivers/phy/phy-common-props.c                | 117 ++++++++++++++
 include/dt-bindings/phy/phy.h                 |   4 +
 include/linux/phy/phy-common-props.h          |  20 +++
 16 files changed, 426 insertions(+), 140 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/phy/phy-common-props.yaml
 delete mode 100644 Documentation/devicetree/bindings/phy/transmit-amplitude.yaml
 create mode 100644 drivers/phy/phy-common-props.c
 create mode 100644 include/linux/phy/phy-common-props.h

-- 
2.34.1