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

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Date:	Thu, 22 Aug 2013 15:14:17 +0200
From:	boris brezillon <b.brezillon@...rkiz.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@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH] phylib: mdio: handle register/unregister/register
 sequence

On 22/08/2013 14:33, Boris BREZILLON wrote:
> Hello,
>
> This patch is a proposal to support the register/unregister/register
> sequence on a given mdio bus.

I forgot to ask, if this limitation was made on purpose ?
In other terms: no one should ever try to register, unregister and 
register again
a given mii_bus structure.

>
> 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
>
> Thanks.
>
> Best Regards,
> Boris
>
> Boris BREZILLON (1):
>    phylib: mdio: handle register/unregister/register sequence
>
>   drivers/net/phy/mdio_bus.c |    6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>

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