linux-kernel - of_mdiobus_register_phy() and deferred probe

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Message-ID: <CAMuHMdX+_0Cf0VwmKDtcfMNwaPEN5jvjZQUXg6MKMJa+cvYz3w@mail.gmail.com>
Date:	Thu, 22 Oct 2015 15:31:34 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: of_mdiobus_register_phy() and deferred probe

Hi,

Due to a probe deferral of an interrupt controller[1], the Micrel
Ethernet PHY on
r8a7791/koelsch started failing to get its IRQ:

    no irq domain found for /interrupt-controller@...c0000 !

However, of_mdiobus_register_phy() uses irq_of_parse_and_map(), which plainly
ignores EPROBE_DEFER, and it just continues.

Later I get:

    sh-eth ee700000.ethernet eth0: attached PHY 1 (IRQ -1) to driver
Micrel KSZ8041RNLI

instead of

    sh-eth ee700000.ethernet eth0: attached PHY 1 (IRQ 408) to driver
Micrel KSZ8041RNLI

Ethernet still works, as the interrupt seems to be unneeded(?).

Has anyone already looked into fixing of_mdio to handle deferred probing?

Thanks!

References:
[1] "Re: [PATCH v4 5/5] [RFC] clk: shmobile: r8a7795: Add new CPG/MSSR driver"
     (http://article.gmane.org/gmane.linux.ports.sh.devel/49979)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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