linux-kernel - Re: [PATCH] of_mdio: Fix broken PHY IRQ in case of probe deferral

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Date:   Thu, 18 May 2017 11:21:45 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     geert+renesas@...der.be
Cc:     andrew@...n.ch, f.fainelli@...il.com, robh+dt@...nel.org,
        frowand.list@...il.com, thomas.petazzoni@...e-electrons.com,
        sergei.shtylyov@...entembedded.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of_mdio: Fix broken PHY IRQ in case of probe deferral

From: Geert Uytterhoeven <geert+renesas@...der.be>
Date: Thu, 18 May 2017 14:59:05 +0200

> If an Ethernet PHY is initialized before the interrupt controller it is
> connected to, a message like the following is printed:
> 
>     irq: no irq domain found for /interrupt-controller@...c0000 !
> 
> However, the actual error is ignored, leading to a non-functional (-1)
> PHY interrupt later:
> 
>     Micrel KSZ8041RNLI ee700000.ethernet-ffffffff:01: attached PHY driver [Micrel KSZ8041RNLI] (mii_bus:phy_addr=ee700000.ethernet-ffffffff:01, irq=-1)
> 
> Depending on whether the PHY driver will fall back to polling, Ethernet
> may or may not work.
> 
> To fix this:
>   1. Switch of_mdiobus_register_phy() from irq_of_parse_and_map() to
>      of_irq_get().
>      Unlike the former, the latter returns -EPROBE_DEFER if the
>      interrupt controller is not yet available, so this condition can be
>      detected.
>      Other errors are handled the same as before, i.e. use the passed
>      mdio->irq[addr] as interrupt.
>   2. Propagate and handle errors from of_mdiobus_register_phy() and
>      of_mdiobus_register_device().
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Florian or someone similarly knowledgable, please review.