5.4-stable review patch. If anyone has any objections, please let me know.
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From: Shengyu Qu wiagn233@outlook.com
commit 623cef652768860bd5f205fb7b741be278585fba upstream.
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... [2] https://forum.beagleboard.org/t/recognizing-a-beaglebone-black-rev-c3-board/...
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 Signed-off-by: Nobuhiro Iwamatsu (CIP) nobuhiro1.iwamatsu@toshiba.co.jp Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm/boot/dts/am335x-bone-common.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/arch/arm/boot/dts/am335x-bone-common.dtsi +++ b/arch/arm/boot/dts/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) >; };
@@ -396,6 +400,10 @@
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>; }; };