From: Florian Fainelli <florian@openwrt.org>
To: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
"David S. Miller" <davem@davemloft.net>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
netdev <netdev@vger.kernel.org>,
"devicetree-discuss@lists.ozlabs.org"
<devicetree-discuss@lists.ozlabs.org>,
Lior Amsalem <alior@marvell.com>,
Gregory Clement <gregory.clement@free-electrons.com>,
Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Subject: Re: [RFC PATCH 2/3] net: phy: call mdiobus_scan() after adding a fixed PHY
Date: Mon, 15 Jul 2013 16:46:05 +0100 [thread overview]
Message-ID: <CAGVrzcbn0FASWBbj-zF+pYnUATm02tUurN_wM0YWrWrTBh+dJQ@mail.gmail.com> (raw)
In-Reply-To: <1373902450-11857-3-git-send-email-thomas.petazzoni@free-electrons.com>
Hello Thomas,
2013/7/15 Thomas Petazzoni <thomas.petazzoni@free-electrons.com>:
> The fixed_phy_add() function allows to register a fixed PHY. However,
> when this function gets called *after* fixed_mdio_bus_init() (which
> gets called at the module_init stage), then the fixed PHY is not
> registered into the phylib.
>
> In order to address this, we add a call to mdiobus_scan() in
> fixed_phy_add() to ensure that the PHY indeed gets registered into the
> phylib, even if the fixed_phy_add() is called after
> fixed_mdio_bus_init().
>
> This is needed because until now, the only code that was calling the
> fixed_add_phy() function was PowerPC-specific platform code, which
> could ensure that such fixed PHYs get registered before
> fixed_mdio_bus_init() is called.
arch/mips/ar7/platform.c also calls fixed_phy_add() early enough as
well to ensure that we do not need to rescan the MDIO bus. There is
also another user: arch/m68k/platform/coldfire/m5272.c
>
> However, with the new of_phy_register_fixed_link() function, device
> drivers can parse their 'fixed-link' property and register a fixed PHY
> at ->probe() time, which may happen after fixed_mdio_bus_init() is
> called.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Florian Fainelli <florian@openwrt.org>
> ---
> drivers/net/phy/fixed.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
> index ba55adf..bd1e67a 100644
> --- a/drivers/net/phy/fixed.c
> +++ b/drivers/net/phy/fixed.c
> @@ -195,6 +195,8 @@ int fixed_phy_add(unsigned int irq, int phy_id,
>
> list_add_tail(&fp->node, &fmb->phys);
>
> + mdiobus_scan(fmb->mii_bus, phy_id);
> +
> return 0;
>
> err_regs:
> --
> 1.8.1.2
>
--
Florian
next prev parent reply other threads:[~2013-07-15 15:46 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-15 15:34 [RFC PATCH 0/3] Add DT support for fixed PHYs Thomas Petazzoni
2013-07-15 15:34 ` [RFC PATCH 1/3] of: provide a binding for the 'fixed-link' property Thomas Petazzoni
2013-07-15 15:50 ` Florian Fainelli
2013-07-23 11:22 ` Mark Rutland
2013-07-23 11:39 ` Florian Fainelli
2013-07-30 9:16 ` Thomas Petazzoni
2013-07-30 10:26 ` Florian Fainelli
2013-07-30 15:28 ` Mark Rutland
2013-07-23 11:39 ` Grant Likely
2013-07-30 9:07 ` Thomas Petazzoni
2013-07-30 10:05 ` Florian Fainelli
2013-07-30 11:23 ` Thomas Petazzoni
2013-07-30 11:43 ` Florian Fainelli
2013-07-30 15:31 ` Mark Rutland
2013-08-12 6:38 ` Sascha Hauer
2013-08-12 8:16 ` Thomas Petazzoni
2013-08-12 8:37 ` Sascha Hauer
2013-08-21 10:55 ` Christian Gmeiner
2013-08-21 11:25 ` Florian Fainelli
2013-08-21 11:46 ` Florian Fainelli
2013-07-15 15:34 ` [RFC PATCH 2/3] net: phy: call mdiobus_scan() after adding a fixed PHY Thomas Petazzoni
2013-07-15 15:46 ` Florian Fainelli [this message]
2013-07-15 15:34 ` [RFC PATCH 3/3] net: mvneta: add support for fixed links Thomas Petazzoni
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