netdev - Re: [PATCH v3 net-next 1/8] arm64: dts: mediatek: mt7986: add support for RX Wireless Ethernet Dispatch

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Date:   Fri, 4 Nov 2022 10:10:42 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, nbd@....name, john@...ozen.org,
        sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, matthias.bgg@...il.com,
        linux-mediatek@...ts.infradead.org, lorenzo.bianconi@...hat.com,
        Bo.Jiao@...iatek.com, sujuan.chen@...iatek.com,
        ryder.Lee@...iatek.com, evelyn.tsai@...iatek.com,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        daniel@...rotopia.org, krzysztof.kozlowski+dt@...aro.org,
        Sam.Shih@...iatek.com
Subject: Re: [PATCH v3 net-next 1/8] arm64: dts: mediatek: mt7986: add support
 for RX Wireless Ethernet Dispatch

Il 04/11/22 10:05, Lorenzo Bianconi ha scritto:
>> Il 03/11/22 10:28, Lorenzo Bianconi ha scritto:
>>> Similar to TX Wireless Ethernet Dispatch, introduce RX Wireless Ethernet
>>> Dispatch to offload traffic received by the wlan interface to lan/wan
>>> one.
>>>
>>> Co-developed-by: Sujuan Chen <sujuan.chen@...iatek.com>
>>> Signed-off-by: Sujuan Chen <sujuan.chen@...iatek.com>
>>> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
>>
>> Hello Lorenzo,
> 
> Hi Angelo,
> 
>> thanks for the patch! However, there's something to improve...
>>
>>> ---
>>>    arch/arm64/boot/dts/mediatek/mt7986a.dtsi | 75 +++++++++++++++++++++++
>>>    1 file changed, 75 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
>>> index 72e0d9722e07..b0a593c6020e 100644
>>> --- a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
>>> +++ b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
>>
>> ..snip..
>>
>>> @@ -226,6 +252,12 @@ ethsys: syscon@...00000 {
>>>    			 reg = <0 0x15000000 0 0x1000>;
>>>    			 #clock-cells = <1>;
>>>    			 #reset-cells = <1>;
>>> +
>>> +			ethsysrst: reset-controller {
>>
>> That's not right. It works, yes, but your ethsys rightfully declares #reset-cells,
>> because it is supposed to also be a reset controller (even though I don't see any
>> reset controller registering action in clk-mt7986-eth.c).
>>
>> Please document the ethernet reset in the appropriate dt-bindings header and
>> register the reset controller in clk-mt7986-eth.c.
>>
>> Finally, you won't need any "ti,syscon-reset" node, and resets will look like
>>
>> 	resets = <&ethsys MT7986_ETHSYS_SOMETHING_SWRST>;
>>
>> If you need any hint about how to do that, please check clk-mt8195-infra_ao.c.
> 
> reviewing the code I think we do not have any mt7986-eth reset line consumer at the
> moment, since:
> - mtk_eth_soc driver rely on syscon for resetting the chip writing directly in the register
>    in ethsys_reset()

Ouch :-)

> - we do not rely on reset api in wed wo code.
> 
> I think we can just drop reset support in ethsys/wo-dlm nodes at the moment (since it
> is not used in this series) and convert the driver to reset api as soon as
> we have proper support in clk-mt7986-eth.c (AFAIU sam will work on it).
> 

If you don't need to add resets to devicetree... then I guess dropping it is ok,
let's go with that.

Regards,
Angelo