From: Shengyu Qu Date: Sun, 6 Aug 2023 08:50:44 +0000 (+0800) Subject: ARM: dts: am335x-bone-common: Add GPIO PHY reset on revision C3 board X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=623cef652768860bd5f205fb7b741be278585fba;p=linux.git 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 Signed-off-by: Shengyu Qu Message-ID: Signed-off-by: Tony Lindgren --- 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 b958607c71dcf..400424b5d4dcc 100644 --- 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>; }; };