linux-kernel - Re: [PATCH v2 6/6] net: phy: DP83640: Add fiber mode enabling/disabling from device tree

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Message-ID: <c1b17410-b403-4c3a-9c00-de8f2b2b2fa7@bootlin.com>
Date: Thu, 29 Feb 2024 08:31:55 +0100
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Pavel Machek <pavel@....cz>,
 Lee Jones <lee@...nel.org>, Richard Cochran <richardcochran@...il.com>,
 Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-leds@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 herve.codina@...tlin.com, maxime.chevallier@...tlin.com,
 christophercordahi@...ometrics.ca
Subject: Re: [PATCH v2 6/6] net: phy: DP83640: Add fiber mode
 enabling/disabling from device tree

Hi Andrew,

On 2/27/24 17:18, Andrew Lunn wrote:
> On Tue, Feb 27, 2024 at 10:39:45AM +0100, Bastien Curutchet wrote:
>> The PHY is able to use copper or fiber. The fiber mode can be enabled or
>> disabled by hardware strap. If hardware strap is incorrect, PHY can't
>> establish link.
>>
>> Add a DT attribute 'ti,fiber-mode' that can be use to override the
>> hardware strap configuration. If the property is not present, hardware
>> strap configuration is left as is.
> How have you tested this? Do you have a RDK with it connected to an
> SFP cage?

I did not test fiber mode as my board uses copper.

My use case is that I need to explicitly disable the fiber mode because 
the strap hardware is
misconfigured and could possibly enable fiber mode from time to time.

Best regards,

Bastien