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Fri, 17 Jul 2026 02:59:42 -0400 (EDT) From: Jiaxing Hu To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, heiko@sntech.de, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com Cc: netdev@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-kernel@vger.kernel.org, maxime.chevallier@bootlin.com, Jiaxing Hu Subject: [PATCH net-next v2 1/2] dt-bindings: net: rockchip-dwmac: allow output clock_in_out for RGMII Date: Fri, 17 Jul 2026 18:59:32 +1200 Message-ID: <20260717065933.2629501-2-gahing@gahingwoo.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260717065933.2629501-1-gahing@gahingwoo.com> References: <20260717065933.2629501-1-gahing@gahingwoo.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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 -- 2.43.0