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Message-ID: <c75d35c1-13f8-4f79-bf96-9a73e88d1b19@kernel.org>
Date: Fri, 1 Mar 2024 23:29:20 +0200
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Subject: Re: [PATCH] arm: dts: ti: beagleplay: Fix Ethernet PHY RESET GPIOs
Content-Language: en-US
From: Roger Quadros <rogerq@kernel.org>
To: Nishanth Menon <nm@ti.com>, Vignesh Raghavendra <vigneshr@ti.com>,
 Tero Kristo <kristo@kernel.org>, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>
Cc: srk@ti.com, s-vadapalli@ti.com, r-gunasekaran@ti.com,
 linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240229-b4-for-v6-9-am65-beagleplay-ethernet-reset-v1-1-b3e4b33378bd@kernel.org>
 <bfd9b146-061b-4f82-a703-3bd32ffc09b7@kernel.org>
In-Reply-To: <bfd9b146-061b-4f82-a703-3bd32ffc09b7@kernel.org>
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On 01/03/2024 22:58, Roger Quadros wrote:
> 
> 
> 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@kernel.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.

Actually PIN_INPUT is correct else we won't be able to read the correct GPIO pin status
on gpio read.
I observe this issue on u-boot at least.

> 
>> +			AM62X_IOPAD(0x018c, PIN_OUTPUT, 7) /* (AC21) RGMII2_RD2.GPIO1_5 */

This one needs to be fixed to PIN_INPUT.

>>  		>;
>>  	};
>>  
>> @@ -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