linux-kernel - Re: [PATCH net-next 2/2] net: stmmac: dwmac-imx: add support for PHY WOL

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Message-ID: <bbe3e611-a310-41f5-a037-4b7d5e914b94@gmail.com>
Date: Wed, 6 Mar 2024 09:41:46 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Catalin Popescu <catalin.popescu@...ca-geosystems.com>,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, robh@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
 kernel@...gutronix.de, festevam@...il.com, xiaoning.wang@....com,
 linux-imx@....com, alexandre.torgue@...s.st.com, joabreu@...opsys.com,
 mcoquelin.stm32@...il.com
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 bsp-development.geo@...ca-geosystems.com, m.felsch@...gutronix.de
Subject: Re: [PATCH net-next 2/2] net: stmmac: dwmac-imx: add support for PHY
 WOL

On 3/6/24 09:24, Catalin Popescu wrote:
> Add support for PHY WOL capability into dwmac-imx MAC driver.
> This is required to enable WOL feature on a platform where MAC
> WOL capability is not sufficient and WOL capability built into
> the PHY is actually needed.
> 
> Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>

Nope, this is not about how to do this. You use a Device Tree property 
as a policy rather than properly describe your systems capabilities.

What sort of Wake-on-LAN do you want to be done by the PHY exactly? Does 
the PHY have packet matching capabilities, or do you want to wake-up 
from a PHY event like link up/down/any interrupt?

If the former, then you would need to interrogate the PHY driver via 
phy_ethtool_get_wol() to figure out what Wake-on-LAN modes it is capable 
of supporting and then make a decision whether to prioritize Wake-on-LAN 
from the PHY or the MAC, or maybe only the PHY can actually wake-up the 
system in your case.

If the latter, then you need to add support for WAKE_PHY to the stmmac
driver.

pw-bot: cr
-- 
Florian