On Fri, Oct 29, 2021 at 08:29:49AM +0530, Prasanna Vengateshan wrote:
> On Thu, 2021-10-28 at 18:05 +0100, Russell King (Oracle) wrote:
> > Hi,
> >
> > I've just sent "net: dsa: populate supported_interfaces member"
> > which adds a hook to allow DSA to populate the newly introduced
> > supported_interfaces member of phylink_config. Once this patch is
> > merged, it would be great to see any new drivers setting this
> > member.
> >
> > Essentially, the phylink_get_interfaces method is called with the
> > DSA switch and port number, and a pointer to the supported_interfaces
> > member - which is a bitmap of PHY_INTERFACE_MODEs that are supported
> > by this port.
> >
> > When you have set any bit in the supported interfaces, phylink's
> > behaviour when calling your lan937x_phylink_validate changes - it will
> > no longer call it with PHY_INTERFACE_MODE_NA, but will instead do a
> > bitwalk over the bitmap, and call it for each supported interface type
> > instead.
> >
> > When phylink has a specific interface mode, it will continue to make a
> > single call - but only if the interface mode is indicated as supported
> > in the supported interfaces bitmap.
> >
> > Please keep an eye on "net: dsa: populate supported_interfaces member"
> > and if you need to respin this series after that patch has been merged,
> > please update in regards of this.
>
> Sure, i will watch out for this series and add to my new driver. Do the?
> new drivers need to still return all supported modes if state->interface
> is set?to %PHY_INTERFACE_MODE_NA as per phylink documentation??I?
> understand that supported_interfaces will?not be empty if
> phylink_get_interfaces() is handled. But i just wanted to double check
> with you.
The phylink documentation has already been updated:
* When @config->supported_interfaces has been set, phylink will iterate
* over the supported interfaces to determine the full capability of the
* MAC. The validation function must not print errors if @state->interface
* is set to an unexpected value.
*
* When @config->supported_interfaces is empty, phylink will call this
* function with @state->interface set to %PHY_INTERFACE_MODE_NA, and
* expects the MAC driver to return all supported link modes.
As I state in my initial reply, ->validate will never be called with
PHY_INTERFACE_MODE_NA if supported_interfaces is populated.
--
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