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ARM: dts: am335x-bone-common: Add GPIO PHY reset on revision C3 board

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This patch adds ethernet PHY reset GPIO config for Beaglebone Black
series boards with revision C3. This fixes a random phy startup failure
bug discussed at [1]. The GPIO pin used for reset is not used on older
revisions, so it is ok to apply to all board revisions. The reset timing
was discussed and tested at [2].

[1] https://forum.digikey.com/t/ethernet-device-is-not-detecting-on-ubuntu-20-04-lts-on-bbg/19948
[2] https://forum.beagleboard.org/t/recognizing-a-beaglebone-black-rev-c3-board/31249/

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
Signed-off-by: Shengyu Qu <wiagn233@outlook.com>
Message-ID: <TY3P286MB26113797A3B2EC7E0348BBB2980FA@TY3P286MB2611.JPNP286.PROD.OUTLOOK.COM>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Shengyu Qu 2023-08-06 16:50:44 +08:00 committed by Tony Lindgren
parent 27c146e3de
commit 623cef6527
1 changed files with 8 additions and 0 deletions
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8
arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi
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@ -145,6 +145,8 @@
/* MDIO */
AM33XX_PADCONF(AM335X_PIN_MDIO, PIN_INPUT_PULLUP | SLEWCTRL_FAST, MUX_MODE0)
AM33XX_PADCONF(AM335X_PIN_MDC, PIN_OUTPUT_PULLUP, MUX_MODE0)
/* Added to support GPIO controlled PHY reset */
AM33XX_PADCONF(AM335X_PIN_UART0_CTSN, PIN_OUTPUT_PULLUP, MUX_MODE7)
>;
};
@ -153,6 +155,8 @@
/* MDIO reset value */
AM33XX_PADCONF(AM335X_PIN_MDIO, PIN_INPUT_PULLDOWN, MUX_MODE7)
AM33XX_PADCONF(AM335X_PIN_MDC, PIN_INPUT_PULLDOWN, MUX_MODE7)
/* Added to support GPIO controlled PHY reset */
AM33XX_PADCONF(AM335X_PIN_UART0_CTSN, PIN_INPUT_PULLDOWN, MUX_MODE7)
>;
};
@ -377,6 +381,10 @@
ethphy0: ethernet-phy@0 {
reg = <0>;
/* Support GPIO reset on revision C3 boards */
reset-gpios = <&gpio1 8 GPIO_ACTIVE_LOW>;
reset-assert-us = <300>;
reset-deassert-us = <6500>;
};
};