Subject: Re: [PATCH v8 0/5] airoha: an7581: USB support

From: Christian Marangi <[email-masked]>
Date: Wed, 20 May 2026 17:14:51 +0200

On Wed, May 20, 2026 at 05:09:05PM +0200, Christian Marangi wrote:
> This is a major rework of the old v2 series.
> 
> The SoC always support USB 2.0 but for USB 3.0 it needs additional
> configuration for the Serdes port. Such port can be either configured
> for USB usage or for PCIe lines or HSGMII and these are configured
> in the SCU space.
> 
> The previous implementation of a dedicated SSR driver was too
> complex and fragile for the simple task of configuring a register
> hence it was dropped and the handling is entirely in the PHY driver.
> 
> Everything was reducted to the dt-bindings to describe the Serdes line.
> 
> Also the property for the PHY are renamed to a more suitable name and
> everything is now mandatory to simplify the implementation.
> (the PHY are always present and active on the SoC)
> 
> Also other unrelated patch are dropped from this series.
> 
> Changes v8:
> - Squash header to clk Documentation patch
> - Address comments from AI Bot
> 
> Changes v7:
> - Rework to double PHY implementation
>   (suggested by Rob)
>   Now the clk driver expose a PHY for Serdes port
>   USB PHY driver selects it
> - Rebase on top of linux-next
>   Link: https://lore.kernel.org/all/[email-masked]/

Typo for the link. It's:

  Link: https://lore.kernel.org/all/[email-masked]/

> 
> Changes v6:
> - Fix kernel test robot (sparse warning)
>   Link: https://lore.kernel.org/all/[email-masked]/
> 
> Changes v5:
> - Add Ack and Review tag from Connor
> - Implement Ethernet support in the USB driver
>   (testing support for this Serdes on a special reference board)
> - Use an7581 prefix for USB PHY driver
>   Link: https://lore.kernel.org/all/[email-masked]/
> 
> Changes v4:
> - Rename PCIe and USB PHY to AN7581
> - Drop airoha,scu (handled directly in driver)
> - Drop dt-bindings for monitor clock in favor of raw values
> - Better describe the usage of airoha,usb3-serdes
> - Simplify values of dt-bindings SSR SERDES
>   Link: https://lore.kernel.org/all/[email-masked]/
> 
> Changes v3:
> - Drop clk changes
> - Drop SSR driver
> - Rename property in Documentation
> - Simplify PHY handling
> - Move SSR handling inside the PHY driver
>   Link: https://lore.kernel.org/all/[email-masked]/
> 
> Changes v2:
> - Drop changes for simple-mfd
> - Rework PHY node structure to single node
> - Drop port-id property in favor of serdes-port and
>   usb2-monitor-clock-sel
> - Make the SSR driver probe from the clock driver
> 
> Christian Marangi (5):
>   dt-bindings: clock: airoha: Add PHY binding for Serdes port
>   dt-bindings: phy: Add documentation for Airoha AN7581 USB PHY
>   clk: en7523: Add support for selecting the Serdes port in SCU
>   phy: move and rename Airoha PCIe PHY driver to dedicated directory
>   phy: airoha: Add support for Airoha AN7581 USB PHY
> 
>  .../bindings/clock/airoha,en7523-scu.yaml     |   9 +
>  .../bindings/phy/airoha,an7581-usb-phy.yaml   |  62 ++
>  MAINTAINERS                                   |  11 +-
>  drivers/clk/Kconfig                           |   1 +
>  drivers/clk/clk-en7523.c                      | 216 ++++++-
>  drivers/phy/Kconfig                           |  11 +-
>  drivers/phy/Makefile                          |   4 +-
>  drivers/phy/airoha/Kconfig                    |  24 +
>  drivers/phy/airoha/Makefile                   |   4 +
>  .../phy-an7581-pcie-regs.h}                   |   2 +-
>  .../phy-an7581-pcie.c}                        |   6 +-
>  drivers/phy/airoha/phy-an7581-usb.c           | 554 ++++++++++++++++++
>  include/dt-bindings/soc/airoha,scu-ssr.h      |  11 +
>  13 files changed, 894 insertions(+), 21 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/phy/airoha,an7581-usb-phy.yaml
>  create mode 100644 drivers/phy/airoha/Kconfig
>  create mode 100644 drivers/phy/airoha/Makefile
>  rename drivers/phy/{phy-airoha-pcie-regs.h => airoha/phy-an7581-pcie-regs.h} (99%)
>  rename drivers/phy/{phy-airoha-pcie.c => airoha/phy-an7581-pcie.c} (99%)
>  create mode 100644 drivers/phy/airoha/phy-an7581-usb.c
>  create mode 100644 include/dt-bindings/soc/airoha,scu-ssr.h
> 
> -- 
> 2.53.0
> 

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