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

From David Miller <davem@davemloft.net>
Newsgroups linux.kernel
Subject Re: [PATCH] net: davinci_mdio: add GPIO reset logic
Date 2017-04-08 16:00 +0200
Message-ID <ttZ4d-5ZB-1@gated-at.bofh.it> (permalink)
References <tsODU-f3-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Roger Quadros <rogerq@ti.com>
Date: Wed, 5 Apr 2017 11:33:57 +0300

> Some boards [1] leave the PHYs at an invalid state
> during system power-up or reset thus causing unreliability
> issues with the PHY like not being detected by the mdio bus
> or link not functional. To work around these boards have
> a GPIO connected to the PHY's reset pin.
> 
> Implement GPIO reset handling for such cases.
> 
> [1] - am572x-idk, am571x-idk, a437x-idk.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Signed-off-by: Sekhar Nori <nsekhar@ti.com>

I have not seen a resolution in this discussion.

My understanding is that there are several cases (single MDIO bus whose
reset does a reset on all that MDIO bus's PHYs, etc.) and it's unclear
how to handle all such cases cleanly.

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Thread

[PATCH] net: davinci_mdio: add GPIO reset logic Roger Quadros <rogerq@ti.com> - 2017-04-05 10:40 +0200
  Re: [PATCH] net: davinci_mdio: add GPIO reset logic Andrew Lunn <andrew@lunn.ch> - 2017-04-05 17:10 +0200
    Re: [PATCH] net: davinci_mdio: add GPIO reset logic Roger Quadros <rogerq@ti.com> - 2017-04-06 11:30 +0200
      Re: [PATCH] net: davinci_mdio: add GPIO reset logic Andrew Lunn <andrew@lunn.ch> - 2017-04-06 14:10 +0200
        Re: [PATCH] net: davinci_mdio: add GPIO reset logic Roger Quadros <rogerq@ti.com> - 2017-04-06 18:50 +0200
  Re: [PATCH] net: davinci_mdio: add GPIO reset logic David Miller <davem@davemloft.net> - 2017-04-08 16:00 +0200
    Re: [PATCH] net: davinci_mdio: add GPIO reset logic Andrew Lunn <andrew@lunn.ch> - 2017-04-08 17:20 +0200
      Re: [PATCH] net: davinci_mdio: add GPIO reset logic Florian Fainelli <f.fainelli@gmail.com> - 2017-04-08 17:20 +0200
        Re: [PATCH] net: davinci_mdio: add GPIO reset logic Roger Quadros <rogerq@ti.com> - 2017-04-10 10:00 +0200

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