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

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>

diff --git a/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi b/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi
index b958607..400424b 100644 (file)
--- a/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi
+++ b/arch/arm/boot/dts/ti/omap/am335x-bone-common.dtsi
@@ -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>;
        };
 };