linux-kernel - Re: [PATCH] arm: dts: ti: beagleplay: Fix Ethernet PHY RESET GPIOs

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Date: Fri, 1 Mar 2024 22:58:06 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
 Tero Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: srk@...com, s-vadapalli@...com, r-gunasekaran@...com,
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: dts: ti: beagleplay: Fix Ethernet PHY RESET GPIOs



On 29/02/2024 18:25, Roger Quadros wrote:
> The RESET GPIO pinmux should be part of MDIO bus node
> so that they can be in the right state before the PHY
> can be probed via MDIO bus scan.
> 
> Add GPIO reset for the Gigabit Ethernet PHY. As per
> RTL8211F datasheet, reset assert width is 10ms and
> PHY registers can be access accessed after 50ms of
> reset deassert.
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> ---
>  arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
> index a34e0df2ab86..77240cf3ae4d 100644
> --- a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
> @@ -292,6 +292,8 @@ mdio0_pins_default: mdio0-default-pins {
>  		pinctrl-single,pins = <
>  			AM62X_IOPAD(0x0160, PIN_OUTPUT, 0) /* (AD24) MDIO0_MDC */
>  			AM62X_IOPAD(0x015c, PIN_INPUT, 0) /* (AB22) MDIO0_MDIO */
> +			AM62X_IOPAD(0x003c, PIN_INPUT, 7) /* (M25) GPMC0_AD0.GPIO0_15 */

This should be PIN_OUTPUT.
Will fix in next spin.

> +			AM62X_IOPAD(0x018c, PIN_OUTPUT, 7) /* (AC21) RGMII2_RD2.GPIO1_5 */
>  		>;
>  	};
>  
> @@ -383,7 +385,6 @@ AM62X_IOPAD(0x017c, PIN_INPUT, 1) /* (AD22) RGMII2_RX_CTL.RMII2_RX_ER */
>  			AM62X_IOPAD(0x016c, PIN_INPUT, 1) /* (Y18) RGMII2_TD0.RMII2_TXD0 */
>  			AM62X_IOPAD(0x0170, PIN_INPUT, 1) /* (AA18) RGMII2_TD1.RMII2_TXD1 */
>  			AM62X_IOPAD(0x0164, PIN_INPUT, 1) /* (AA19) RGMII2_TX_CTL.RMII2_TX_EN */
> -			AM62X_IOPAD(0x018c, PIN_OUTPUT, 7) /* (AC21) RGMII2_RD2.GPIO1_5 */
>  			AM62X_IOPAD(0x0190, PIN_INPUT, 7) /* (AE22) RGMII2_RD3.GPIO1_6 */
>  			AM62X_IOPAD(0x01f0, PIN_OUTPUT, 5) /* (A18) EXT_REFCLK1.CLKOUT0 */
>  		>;
> @@ -597,6 +598,9 @@ &cpsw3g_mdio {
>  
>  	cpsw3g_phy0: ethernet-phy@0 {
>  		reg = <0>;
> +		reset-gpios = <&main_gpio0 15 GPIO_ACTIVE_LOW>;
> +		reset-assert-us = <10000>;
> +		reset-deassert-us = <50000>;
>  	};
>  
>  	cpsw3g_phy1: ethernet-phy@1 {
> @@ -615,7 +619,7 @@ &main_gpio0 {
>  		"USR0", "USR1", "USR2", "USR3", "", "", "USR4",	/* 3-9 */
>  		"EEPROM_WP",					/* 10 */
>  		"CSI2_CAMERA_GPIO1", "CSI2_CAMERA_GPIO2",	/* 11-12 */
> -		"CC1352P7_BOOT", "CC1352P7_RSTN", "", "", "",	/* 13-17 */
> +		"CC1352P7_BOOT", "CC1352P7_RSTN", "GBE_RSTN", "", "",	/* 13-17 */
>  		"USR_BUTTON", "", "", "", "", "", "", "", "",	/* 18-26 */
>  		"", "", "", "", "", "", "", "", "", "HDMI_INT",	/* 27-36 */
>  		"", "VDD_WLAN_EN", "", "", "WL_IRQ", "GBE_INTN",/* 37-42 */
> 
> ---
> base-commit: bbef42084cc170cbfc035bf784f2ff055c939d7e
> change-id: 20240229-b4-for-v6-9-am65-beagleplay-ethernet-reset-098f274fbf15
> 
> Best regards,

-- 
cheers,
-roger