[PATCH v2 5/7] powerpc/corenet: Add MDIO bus muxing support to the board device tree(s)

[Shaohui Xie]

> -----Original Message-----
> From: Linuxppc-dev [mailto:linuxppc-dev-
> bounces+b21989=freescale.com at lists.ozlabs.org] On Behalf Of Scott Wood
> Sent: Friday, August 01, 2014 2:31 AM
> To: Medve Emilian-EMMEDVE1
> Cc: linuxppc-dev at ozlabs.org
> Subject: Re: [PATCH v2 5/7] powerpc/corenet: Add MDIO bus muxing support
> to the board device tree(s)
> 
> On Thu, 2014-07-31 at 00:48 -0500, Emil Medve wrote:
> > Hello Scott,
> >
> >
> > On 07/31/2014 12:28 AM, Scott Wood wrote:
> > > On Wed, 2014-07-30 at 23:35 -0500, Emil Medve wrote:
> > >> Hello Scott,
> > >>
> > >>
> > >> On 07/30/2014 09:30 PM, Scott Wood wrote:
> > >>> On Wed, 2014-07-30 at 16:52 -0500, Emil Medve wrote:
> > >>>>>>>> +			mdio0: mdio <at> fc000 {
> > >>>>>>>> +			};
> > >>>>>>>
> > >>>>>>> Why is the empty node needed?
> > >>>>>>
> > >>>>>> For the label
> > >>>>>
> > >>>>> For mdio-parent-bus, or is there some other dts layer that makes
> > >>>>> this node non-empty?
> > >>>>
> > >>>> 'powerpc/corenet: Create the dts components for the DPAA FMan' -
> > >>>> http://patchwork.ozlabs.org/patch/370872
> > >>>
> > >>> Why does this patch define the mdio0 label for mdio at e1120, but not
> > >>> define a label for any other node?
> > >>
> > >> Only MDIO controllers that are pinned out have these labels. Only
> > >> pinned out MDIO(s) are capable of controlling external PHY(s) via
> > >> these board level MDIO buses
> > >
> > > Is there any reason to describe non-pinned-out MDIO controllers at
> all?
[S.H] Regarding the pinned-out MDIO controllers and non-pinned-out MDIO controllers,
How to differentiate them?

> >
> > Yes. For the internal TBI PHY(s). Each MAC supporting SGMII has a TBI
> > PHY that is attached to the MDIO controller of the respective MAC
> 
[S.H] there are multiple internal PHYs on Fman-v3 SOCs. Each one is used for
Specific function, for ex. on T4 there are XFI, SGMII, QSGMII.
Will all of them be listed in the DTS? 

Thanks!

-Shaohui