linux-kernel - Re: [PATCH] ARM: dts: rockchip: add ethernet phy node for tinker board

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Message-ID: <ccf5ad2c-bd56-2d77-4728-d7906045e302@katsuster.net>
Date:   Sat, 22 Jun 2019 23:50:10 +0900
From:   Katsuhiro Suzuki <katsuhiro@...suster.net>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: rockchip: add ethernet phy node for tinker
 board

Hello,

Current linux-next on my environment, 'ifconfig eth0 up' does not
work correctly with following message...

-----
root@...aro-alip:~# ifconfig eth0 up
[  105.028916] rk_gmac-dwmac ff290000.ethernet eth0: stmmac_open: Cannot 
attach to PHY (error: -19)
SIOCSIFFLAGS: No such device
-----

I checked drivers/net/ethernet/stmicro/stmmac/stmmac_main.c and found
stmmac_init_phy() is going to fail if ethernet device node does not
have following property:
   - phy-handle
   - phy
   - phy-device

I salvaged old version of linux-next kernel (5.2.0-rc1-20190523),
network device of my Tinker Board worked correctly if use it.

I have not bisect commit of root cause yet... Is it better to bisect
and find problem instead of sending this patch?

Best Regards,
---
Katsuhiro Suzuki


On 2019/06/22 17:33, Heiko Stuebner wrote:
> Hi,
> 
> Am Freitag, 21. Juni 2019, 20:00:17 CEST schrieb Katsuhiro Suzuki:
>> This patch adds missing mdio and ethernet PHY nodes for rk3328 ASUS
>> tinker board.
>>
>> Signed-off-by: Katsuhiro Suzuki <katsuhiro@...suster.net>
> 
> just for my understanding, which problem does this solve?
> Normally the gmac can establish connections just fine on
> the rk3288 by probing the phy in the automatic way.
> 
> And I also don't see any additional properties like phy
> interrupt line below.
> 
> 
> Thanks
> Heiko
> 
>> ---
>>   arch/arm/boot/dts/rk3288-tinker.dtsi | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/rk3288-tinker.dtsi b/arch/arm/boot/dts/rk3288-tinker.dtsi
>> index 293576869546..3190817e8d5d 100644
>> --- a/arch/arm/boot/dts/rk3288-tinker.dtsi
>> +++ b/arch/arm/boot/dts/rk3288-tinker.dtsi
>> @@ -117,6 +117,7 @@
>>   	assigned-clocks = <&cru SCLK_MAC>;
>>   	assigned-clock-parents = <&ext_gmac>;
>>   	clock_in_out = "input";
>> +	phy-handle = <&phy0>;
>>   	phy-mode = "rgmii";
>>   	phy-supply = <&vcc33_lan>;
>>   	pinctrl-names = "default";
>> @@ -127,6 +128,17 @@
>>   	tx_delay = <0x30>;
>>   	rx_delay = <0x10>;
>>   	status = "ok";
>> +
>> +	mdio0 {
>> +		compatible = "snps,dwmac-mdio";
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +
>> +		phy0: ethernet-phy@0 {
>> +			compatible = "ethernet-phy-ieee802.3-c22";
>> +			reg = <0>;
>> +		};
>> +	};
>>   };
>>   
>>   &gpu {
>>
> 
> 
> 
> 
>