linux-kernel - Re: [RFC PATCH] phylib: mdio: handle register/unregister/register sequence

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Message-ID: <CAGVrzcaByva=8xiswcsW1B8G4dL=jY0RdaHKzNqaT_0Lrwbprg@mail.gmail.com>
Date:	Thu, 22 Aug 2013 13:43:37 +0100
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Boris BREZILLON <b.brezillon@...rkiz.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Mark Brown <broonie@...nel.org>,
	Nick Bowler <nbowler@...iptictech.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH] phylib: mdio: handle register/unregister/register sequence

Hello Boris,

2013/8/22 Boris BREZILLON <b.brezillon@...rkiz.com>:
> Hello,
>
> This patch is a proposal to support the register/unregister/register
> sequence on a given mdio bus.
>
> I use the register/unregister/register sequence to add a fallback when the
> of_mdiobus_register (this function calls mdiobus_register with phy_mask
> set to ~0) does not register any phy device (because the device tree does
> not define any phy).
> In this case I call mdiobus_unregister and then call mdiobus_register with
> a phy_mask set to 0 to trigger a full mdio bus scan.
>
> I'm not sure this is the right way to do it (this is why I added RFC in the
> subject).
>
> Could someone help me figuring out what I should use to implement my fallback ?
>
> 1) use the register/unregister/register sequence
> 2) reimplement the "for (i = 0; i < PHY_MAX_ADDR; i++)" mdiobus_scan loop

I think solution 2 is nicer, in that case, would it be enough in your
case to export a function called mdiobus_scan()? You could call at a
time you know PHY devices have a chance of having been probed?
-- 
Florian
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