netdev - Re: [PATCH] net: davinci_mdio: add GPIO reset logic

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Message-ID: <4611f957-4de2-ccf6-c9e6-1ace1f3f8ac3@ti.com>
Date:   Thu, 6 Apr 2017 19:48:50 +0300
From:   Roger Quadros <rogerq@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <davem@...emloft.net>, <tony@...mide.com>, <nsekhar@...com>,
        <jsarha@...com>, <netdev@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: davinci_mdio: add GPIO reset logic


On 06/04/17 15:05, Andrew Lunn wrote:
>>> Do you really need more than one GPIO? A single gpio would make all
>>> this code a lot simpler.
>>>
>>
>> Yes we need. Some of our boards have separate GPIO RESET lines for
>> different PHYs on the same MDIO bus.
> 
> If you have a one-to-one mapping of GPIO and PHY, you should really be
> modelling that differently. You want to be able to reset just a single
> PHY, i.e. make it part of the PHY driver, or maybe the PHY core.
> 
>      Andrew
> 


I'm not sure how it would be modelled. We have never had the need to reset
just one PHY on the MDIO bus.
Some boards have a single RESET line to multiple PHYs whereas others have individual
RESET lines. In all cases we just want to do the RESET once per boot.

cheers,
-roger