[PATCH] arm64: dts: imx8mp: Fix LAN8740Ai PHY reference clock on DH electronics i.MX8M Plus DHCOM

[PATCH] arm64: dts: imx8mp: Fix LAN8740Ai PHY reference clock on DH electronics i.MX8M Plus DHCOM

[Marek Vasut]

Add missing 'clocks' property to LAN8740Ai PHY node, to allow the PHY driver
to manage LAN8740Ai CLKIN reference clock supply. This fixes sporadic link
bouncing caused by interruptions on the PHY reference clock, by letting the
PHY driver manage the reference clock and assure there are no interruptions.

This follows the matching PHY driver recommendation described in commit
bedd8d78aba3 ("net: phy: smsc: LAN8710/20: add phy refclk in support")

Fixes: 8d6712695bc8 ("arm64: dts: imx8mp: Add support for DH electronics i.MX8M Plus DHCOM and PDK2")
Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>
---
Cc: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: imx@lists.linux.dev
Cc: kernel@dh-electronics.com
Cc: linux-arm-kernel@lists.infradead.org
---
 arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi
index 68c2e0156a5c8..f8303b7e2bd22 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi
@@ -113,6 +113,7 @@ mdio {
 		ethphy0f: ethernet-phy@1 { /* SMSC LAN8740Ai */
 			compatible = "ethernet-phy-id0007.c110",
 				     "ethernet-phy-ieee802.3-c22";
+			clocks = <&clk IMX8MP_CLK_ENET_QOS>;
 			interrupt-parent = <&gpio3>;
 			interrupts = <19 IRQ_TYPE_LEVEL_LOW>;
 			pinctrl-0 = <&pinctrl_ethphy0>;
-- 
2.51.0

RE: [PATCH] arm64: dts: imx8mp: Fix LAN8740Ai PHY reference clock on DH electronics i.MX8M Plus DHCOM

[Christoph Niedermaier]

From: Marek Vasut <marek.vasut@mailbox.org>
Sent: Tuesday, December 2, 2025 2:42 PM
> Add missing 'clocks' property to LAN8740Ai PHY node, to allow the PHY driver
> to manage LAN8740Ai CLKIN reference clock supply. This fixes sporadic link
> bouncing caused by interruptions on the PHY reference clock, by letting the
> PHY driver manage the reference clock and assure there are no interruptions.
> 
> This follows the matching PHY driver recommendation described in commit
> bedd8d78aba3 ("net: phy: smsc: LAN8710/20: add phy refclk in support")
> 
> Fixes: 8d6712695bc8 ("arm64: dts: imx8mp: Add support for DH electronics i.MX8M Plus DHCOM
> and PDK2")
> Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>
> ---
> Cc: Christoph Niedermaier <cniedermaier@dh-electronics.com>
> Cc: Conor Dooley <conor+dt@kernel.org>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: imx@lists.linux.dev
> Cc: kernel@dh-electronics.com
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi
> index 68c2e0156a5c8..f8303b7e2bd22 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-dhcom-som.dtsi
> @@ -113,6 +113,7 @@ mdio {
>                 ethphy0f: ethernet-phy@1 { /* SMSC LAN8740Ai */
>                         compatible = "ethernet-phy-id0007.c110",
>                                      "ethernet-phy-ieee802.3-c22";
> +                       clocks = <&clk IMX8MP_CLK_ENET_QOS>;
>                         interrupt-parent = <&gpio3>;
>                         interrupts = <19 IRQ_TYPE_LEVEL_LOW>;
>                         pinctrl-0 = <&pinctrl_ethphy0>;

Tested-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>

Regards
Christoph

Re: [PATCH] arm64: dts: imx8mp: Fix LAN8740Ai PHY reference clock on DH electronics i.MX8M Plus DHCOM

[Shawn Guo]

On Tue, Dec 02, 2025 at 02:41:51PM +0100, Marek Vasut wrote:
> Add missing 'clocks' property to LAN8740Ai PHY node, to allow the PHY driver
> to manage LAN8740Ai CLKIN reference clock supply. This fixes sporadic link
> bouncing caused by interruptions on the PHY reference clock, by letting the
> PHY driver manage the reference clock and assure there are no interruptions.
> 
> This follows the matching PHY driver recommendation described in commit
> bedd8d78aba3 ("net: phy: smsc: LAN8710/20: add phy refclk in support")
> 
> Fixes: 8d6712695bc8 ("arm64: dts: imx8mp: Add support for DH electronics i.MX8M Plus DHCOM and PDK2")
> Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>

Applied, thanks!