linux-kernel - Re: [PATCH net-next v4 13/12] net: lan865x: optional hardware reset

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Date: Tue, 30 Apr 2024 16:14:03 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Parthiban.Veerasooran@...rochip.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, horms@...nel.org, saeedm@...dia.com,
	anthony.l.nguyen@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, corbet@....net,
	linux-doc@...r.kernel.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, Horatiu.Vultur@...rochip.com,
	ruanjinjie@...wei.com, Steen.Hegelund@...rochip.com,
	vladimir.oltean@....com, UNGLinuxDriver@...rochip.com,
	Thorsten.Kummermehr@...rochip.com, Pier.Beruto@...emi.com,
	Selvamani.Rajagopal@...emi.com, Nicolas.Ferre@...rochip.com,
	benjamin.bigler@...nformulastudent.ch,
	ramon.nordin.rodriguez@...roamp.se
Subject: Re: [PATCH net-next v4 13/12] net: lan865x: optional hardware reset

> In the spec, external RESET pin is mentioned as "if implemented", in my 
> understanding it is MAC-PHY vendors choice of implementing it where 
> Microchip is implemented it. Using this reset, can be a application 
> requirement/decision. It can be controlled from an external application 
> where it is not needed SPI to operate.

Since it is optional, controlling the reset pin is clearly not
something for the TC6 core.

However, i doubt having an external application controlling the reset
is a good idea. You don't want to reset during operation. So to me,
this reset should be controlled by the driver. I tend to agree, that
actually performing a reset is optional, but i would expect the driver
to ensure the device is taken out of reset during probe, if the power
on default of the board is to hold it in reset.

   Andrew