[PATCH net-next v2 1/2] dt-bindings: net: rockchip-dwmac: allow output clock_in_out for RGMII
From: Jiaxing Hu <hidden>
Date: 2026-07-17 06:59:57
Also in:
linux-arm-kernel, linux-rockchip, lkml
Subsystem:
networking drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
The clock_in_out description said RGMII must use "input". That is no longer true: an RGMII PHY with no crystal can take its 25 MHz reference from the SoC, in which case clock_in_out is "output". Document it. Signed-off-by: Jiaxing Hu <redacted> --- Documentation/devicetree/bindings/net/rockchip-dwmac.yaml | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml b/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
index 80c252845..d5816d6dc 100644
--- a/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml@@ -89,8 +89,9 @@ properties: clock_in_out: description: - For RGMII, it must be "input", means main clock(125MHz) - is not sourced from SoC's PLL, but input from PHY. + For RGMII, "input" means the 125MHz main clock is input from the + PHY, not sourced from the SoC PLL; "output" means the SoC provides + a 25MHz reference clock out to a crystal-less PHY. For RMII, "input" means PHY provides the reference clock(50MHz), "output" means GMAC provides the reference clock. $ref: /schemas/types.yaml#/definitions/string
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2.43.0