linux-kernel - [PATCH v3 0/2] Add motorcomm phy pad-driver-strength-cfg support

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Message-ID: <20230526090502.29835-1-samin.guo@starfivetech.com>
Date:   Fri, 26 May 2023 17:05:00 +0800
From:   Samin Guo <samin.guo@...rfivetech.com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, Peter Geis <pgwipeout@...il.com>,
        Frank <Frank.Sae@...or-comm.com>
CC:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        "Heiner Kallweit" <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "Samin Guo" <samin.guo@...rfivetech.com>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>
Subject: [PATCH v3 0/2] Add motorcomm phy pad-driver-strength-cfg support

The motorcomm phy (YT8531) supports the ability to adjust the drive
strength of the rx_clk/rx_data, and the default strength may not be
suitable for all boards. So add configurable options to better match
the boards.(e.g. StarFive VisionFive 2)

The first patch adds a description of dt-bingding, and the second patch adds
YT8531's parsing and settings for pad-driver-strength-cfg.

'Magic numbers' are used because we haven't been able to get real units
from motorcomm yet, but similar usage has been found in
Documentation/devicetree/bindings/net/qca,ar803x.yaml.

  qca,clk-out-strength:
    description: Clock output driver strength.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2]


Changes since v2:
Patch 2:
- Readjusted the order of YT8531_RGMII_xxx to below YTPHY_PAD_DRIVE_STRENGTH_REG (by Frank Sae)
- Reversed Christmas tree, sort these longest first, shortest last (by Andrew Lunn)
- Rebased on tag v6.4

Changes since v1:
Patch 1:
- Renamed "rx-xxx-driver-strength" to "motorcomm,rx-xxx-driver-strength" (by Frank Sae)
Patch 2:
- Added default values for rxc/rxd driver strength (by Frank Sea/Andrew Lunn)
- Added range checking when val is in DT (by Frank Sea/Andrew Lunn)

Previous versions:
v1 - https://patchwork.kernel.org/project/netdevbpf/cover/20230426063541.15378-1-samin.guo@starfivetech.com
v2 - https://patchwork.kernel.org/project/netdevbpf/cover/20230505090558.2355-1-samin.guo@starfivetech.com

Samin Guo (2):
  dt-bindings: net: motorcomm: Add pad driver strength cfg
  net: phy: motorcomm: Add pad drive strength cfg support

 .../bindings/net/motorcomm,yt8xxx.yaml        | 12 +++++
 drivers/net/phy/motorcomm.c                   | 46 +++++++++++++++++++
 2 files changed, 58 insertions(+)


base-commit: 3201bee3a7171617da7cdbce06c428fb628c9944
--
2.17.1