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Fri, 04 May 2018 10:04:55 -0700 (PDT) Received: from [10.69.41.93] ([192.19.223.250]) by smtp.googlemail.com with ESMTPSA id z42-v6sm9768231edz.36.2018.05.04.10.04.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 04 May 2018 10:04:54 -0700 (PDT) Subject: Re: [PATCH net-next v2 02/13] net: phy: sfp: handle non-wired SFP connectors To: Antoine Tenart , davem@davemloft.net, kishon@ti.com, linux@armlinux.org.uk, gregory.clement@bootlin.com, andrew@lunn.ch, jason@lakedaemon.net, sebastian.hesselbarth@gmail.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com, maxime.chevallier@bootlin.com, miquel.raynal@bootlin.com, nadavh@marvell.com, stefanc@marvell.com, ymarkman@marvell.com, mw@semihalf.com, linux-arm-kernel@lists.infradead.org References: <20180504135643.23466-1-antoine.tenart@bootlin.com> <20180504135643.23466-3-antoine.tenart@bootlin.com> From: Florian Fainelli Openpgp: preference=signencrypt Autocrypt: addr=f.fainelli@gmail.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180504135643.23466-3-antoine.tenart@bootlin.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/04/2018 06:56 AM, Antoine Tenart wrote: > SFP connectors can be solder on a board without having any of their pins > (LOS, i2c...) wired. In such cases the SFP link state cannot be guessed, > and the overall link status reporting is left to other layers. > > In order to achieve this, a new SFP_DEV status is added, named UNKNOWN. > This mode is set when it is not possible for the SFP code to get the > link status and as a result the link status is reported to be always UP > from the SFP point of view. Why represent the SFP in Device Tree then? Why not just declare this is a fixed link which would avoid having to introduce this "unknown" state. -- Florian