linux-kernel - [PATCH 0/8] phy: zynqmp: Perform complete initialization, including ILL calibration

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Message-Id: <20260203002128.935842-1-sean.anderson@linux.dev>
Date: Mon,  2 Feb 2026 19:21:20 -0500
From: Sean Anderson <sean.anderson@...ux.dev>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Vinod Koul <vkoul@...nel.org>,
	linux-phy@...ts.infradead.org
Cc: Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
	linux-kernel@...r.kernel.org,
	Michal Simek <michal.simek@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Thippeswamy Havalige <thippeswamy.havalige@....com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sean Anderson <sean.anderson@...ux.dev>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	devicetree@...r.kernel.org
Subject: [PATCH 0/8] phy: zynqmp: Perform complete initialization, including ILL calibration

This series completely initializes the GTRs in Linux, making all
bootloader initialization (as performed by init_serdes() in
psu_init_gpl.c) optional. This gives the following advantages:

- On some boards (mine) the reference clocks may not be configured in
  SPL/FSBL. So ILL calibration will fail (and take a long time to do so)
  unless we defer initialization to U-Boot/Linux where the phy driver
  can request the clocks.
- If PCIe/SATA are not used in U-Boot, ILL calibration can be deferred
  until Linux when it can be done it parallel with other initialization.
- We will have flexibility to switch between different configurations at
  runtime. For example, this could allow supporting both SATA and PCIe M.2
  cards with [1].

I have tested this series with DP, PCIe, SGMII, and SATA. USB3 is broken
on my dev board at the moment (independent of this series; need to
investigate) so I have not tested that. I have an equivalent set of
patches for U-Boot that I will try to post soon.

[1] https://lore.kernel.org/linux-pci/20260107-pci-m2-v5-0-8173d8a72641@oss.qualcomm.com/


Sean Anderson (8):
  dt-bindings: pci: xilinx-nwl: Add resets
  phy: zynqmp: Refactor bus width configuration into helper
  phy: zynqmp: Refactor common phy initialization into a helper
  phy: zynqmp: Calibrate ILL if necessary
  phy: zynqmp: Initialize chicken bits
  PCI: xilinx-nwl: Split phy_init from phy_power_on
  PCI: xilinx-nwl: Reset the core during probe
  arm64: zynqmp: Add PCIe resets

 .../bindings/pci/xlnx,nwl-pcie.yaml           |  17 +
 arch/arm64/boot/dts/xilinx/zynqmp.dtsi        |   4 +
 drivers/pci/controller/pcie-xilinx-nwl.c      | 255 +++++++--
 drivers/phy/xilinx/phy-zynqmp.c               | 487 +++++++++++++++++-
 4 files changed, 713 insertions(+), 50 deletions(-)

-- 
2.35.1.1320.gc452695387.dirty