linux-kernel - [PATCH v7 0/5] Introduce SpacemiT K1 PCIe phy support

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Message-ID: <20251218151235.454997-1-elder@riscstar.com>
Date: Thu, 18 Dec 2025 09:12:26 -0600
From: Alex Elder <elder@...cstar.com>
To: dlan@...too.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	vkoul@...nel.org,
	kishon@...nel.org
Cc: ziyao@...root.org,
	aurelien@...el32.net,
	johannes@...felt.com,
	pjw@...nel.org,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	p.zabel@...gutronix.de,
	guodong@...cstar.com,
	devicetree@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	spacemit@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v7 0/5] Introduce SpacemiT K1 PCIe phy support

This series introduces a PHY driver to support PCIe on the SpacemiT K1
SoC.  The PCIe controller implementation is derived from a Synopsys
DesignWare PCIe IP.  The PHY driver supports one combination PCIe/USB
PHY as well as two PCIe-only PHYs.  The combo PHY port uses one PCIe
lane, and the other two ports each have two lanes.  All PCIe ports
operate at 5 GT/second.

The PCIe PHYs must be configured using a value that can only be
determined using the combo PHY, operating in PCIe mode.  To allow
that PHY to be used for USB, the needed calibration step is performed
by the PHY driver automatically at probe time.  Once this step is done,
the PHY can be used for either PCIe or USB.

The PCIe controller driver that was included in earlier versions of
this series has already been accepted upstream:
  a812b09a6b599 ("dt-bindings: pci: spacemit: Introduce PCIe host
		  controller")
  ff64e078e45fa ("PCI: spacemit: Add SpacemiT PCIe host driver")
However this series still includes devicetree patches to enable the
PCIe controller (along with the PHYs).

The patches that remain in version 7 of this series are unchanged;
they are simply rebased on top of Linux v6.19-rc1.  The first two
patches are the DT bindings for the PCIe and combo PCIe/USB PHY.
The third is the PHY driver, and the last two are devicetree updates
to enable the PCIe controller and PHYs.

					-Alex

Alex Elder (5):
  dt-bindings: phy: spacemit: Add SpacemiT PCIe/combo PHY
  dt-bindings: phy: spacemit: Introduce PCIe PHY
  phy: spacemit: Introduce PCIe/combo PHY
  riscv: dts: spacemit: Add a PCIe regulator
  riscv: dts: spacemit: PCIe and PHY-related updates

 .../bindings/phy/spacemit,k1-combo-phy.yaml   | 114 +++
 .../bindings/phy/spacemit,k1-pcie-phy.yaml    |  71 ++
 .../boot/dts/spacemit/k1-bananapi-f3.dts      |  44 ++
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi  |  33 +
 arch/riscv/boot/dts/spacemit/k1.dtsi          | 176 +++++
 drivers/phy/Kconfig                           |  11 +
 drivers/phy/Makefile                          |   1 +
 drivers/phy/phy-spacemit-k1-pcie.c            | 670 ++++++++++++++++++
 8 files changed, 1120 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/spacemit,k1-combo-phy.yaml
 create mode 100644 Documentation/devicetree/bindings/phy/spacemit,k1-pcie-phy.yaml
 create mode 100644 drivers/phy/phy-spacemit-k1-pcie.c

base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
-- 
2.48.1