Specifically on AM64 SoM design, the DP83869 phys have a chance to lock up if reset gpio changes state. Update the pinmux to input-only, strongly enforcing that these signals are left floating at all times. This avoids sporadic phy initialisation errors mostly encountered during power-on and reset. In this state the phys respond to all mdio messages with a constant response, recovering only after power-cycle. Signed-off-by: Josua Mayer <josua@xxxxxxxxxxxxx> --- Changes in v2: - update commit message with additional details - rebased on v6.11-rc1 - Link to v1: https://lore.kernel.org/r/20240704-am64-phy-lockup-v1-1-4a38ded44f9d@xxxxxxxxxxxxx --- arch/arm64/boot/dts/ti/k3-am642-sr-som.dtsi | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/boot/dts/ti/k3-am642-sr-som.dtsi b/arch/arm64/boot/dts/ti/k3-am642-sr-som.dtsi index c19d0b8bbf0f..b1f06071df4c 100644 --- a/arch/arm64/boot/dts/ti/k3-am642-sr-som.dtsi +++ b/arch/arm64/boot/dts/ti/k3-am642-sr-som.dtsi @@ -320,7 +320,7 @@ AM64X_IOPAD(0x0278, PIN_INPUT, 7) /* EXTINTn.GPIO1_70 */ ethernet_phy0_default_pins: ethernet-phy0-default-pins { pinctrl-single,pins = < /* reset */ - AM64X_IOPAD(0x0154, PIN_OUTPUT, 7) /* PRG1_PRU1_GPO19.GPIO0_84 */ + AM64X_IOPAD(0x0154, PIN_INPUT, 7) /* PRG1_PRU1_GPO19.GPIO0_84 */ /* reference clock */ AM64X_IOPAD(0x0274, PIN_OUTPUT, 5) /* EXT_REFCLK1.CLKOUT0 */ >; @@ -329,7 +329,7 @@ AM64X_IOPAD(0x0274, PIN_OUTPUT, 5) /* EXT_REFCLK1.CLKOUT0 */ ethernet_phy1_default_pins: ethernet-phy1-default-pins { pinctrl-single,pins = < /* reset */ - AM64X_IOPAD(0x0150, PIN_OUTPUT, 7) /* PRG1_PRU1_GPO18.GPIO0_20 */ + AM64X_IOPAD(0x0150, PIN_INPUT, 7) /* PRG1_PRU1_GPO18.GPIO0_20 */ /* led0, external pull-down on SoM */ AM64X_IOPAD(0x0128, PIN_INPUT, 7) /* PRG1_PRU1_GPO8.GPIO0_73 */ /* led1/rxer */ @@ -340,7 +340,7 @@ AM64X_IOPAD(0x011c, PIN_INPUT, 7) /* PRG1_PRU1_GPO5.GPIO0_70 */ ethernet_phy2_default_pins: ethernet-phy2-default-pins { pinctrl-single,pins = < /* reset */ - AM64X_IOPAD(0x00d4, PIN_OUTPUT, 7) /* PRG1_PRU0_GPO7.GPIO0_52 */ + AM64X_IOPAD(0x00d4, PIN_INPUT, 7) /* PRG1_PRU0_GPO7.GPIO0_52 */ /* led0, external pull-down on SoM */ AM64X_IOPAD(0x00d8, PIN_INPUT, 7) /* PRG1_PRU0_GPO8.GPIO0_53 */ /* led1/rxer */ --- base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b change-id: 20240704-am64-phy-lockup-107ea5ffa228 Best regards, -- Josua Mayer <josua@xxxxxxxxxxxxx>
