linux-kernel - [PATCH v2 0/3] phy: rockchip-snps-pcie3: add support for rockchip,phy-ref-use-pad

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Message-Id: <20250806133824.525871-1-rick.wertenbroek@gmail.com>
Date: Wed,  6 Aug 2025 15:38:20 +0200
From: Rick Wertenbroek <rick.wertenbroek@...il.com>
To: 
Cc: rick.wertenbroek@...g-vd.ch,
	dlemoal@...nel.org,
	alberto.dassatti@...g-vd.ch,
	Rick Wertenbroek <rick.wertenbroek@...il.com>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] phy: rockchip-snps-pcie3: add support for rockchip,phy-ref-use-pad

Add the possibility for the RK3588 PCIe PHYs to use an internal clock instead of
a clock provided on a pin of the device. This allows boards that don't have a
PCIe clock connected to the reference pad to still function in separate clock
mode by using an internal reference clock for the PCIe PHYs.

This was tested with a CM3588 compute module on a custom PCB.

Without the new option, the default behaviour (PHYs using external pad for clock)
is applied, to keep compatibility with existing device trees.

Differences from V1 [1] :

- Documented the phy-ref-use-pad option in the DT bindings.
- Documented the extra optional differential clocks for the PHYs in the DT
  bindings.

[1] https://lore.kernel.org/all/20250715105820.4037272-1-rick.wertenbroek@gmail.com/

Rick Wertenbroek (3):
  dt-bindings: phy: rockchip,pcie3-phy: add optional differential phy
    clocks
  phy: rockchip-snps-pcie3: add support for rockchip,phy-ref-use-pad
  dt-bindings: phy: rockchip,pcie3-phy: add rockchip,phy-ref-use-pad

 .../bindings/phy/rockchip,pcie3-phy.yaml      | 21 ++++++++++--
 .../phy/rockchip/phy-rockchip-snps-pcie3.c    | 32 +++++++++++++++++++
 2 files changed, 50 insertions(+), 3 deletions(-)

-- 
2.25.1