netdev - RE: [EXT] Re: [PATCH v1 6/7] net: phylink: Introduce phylink_fwnode_phy

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Date:   Wed, 5 Feb 2020 11:33:40 +0000
From:   "Calvin Johnson (OSS)" <calvin.johnson@....nxp.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
CC:     "linux.cj@...il.com" <linux.cj@...il.com>,
        Jon Nettleton <jon@...id-run.com>,
        Makarand Pawagi <makarand.pawagi@....com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Varun Sethi <V.Sethi@....com>,
        Pankaj Bansal <pankaj.bansal@....com>,
        "Rajesh V. Bikkina" <rajesh.bikkina@....com>,
        "Calvin Johnson (OSS)" <calvin.johnson@....nxp.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH v1 6/7] net: phylink: Introduce
 phylink_fwnode_phy_connect()

> -----Original Message-----
> From: Russell King - ARM Linux admin <linux@...linux.org.uk>
> Sent: Tuesday, February 4, 2020 12:11 AM
> To: Calvin Johnson <calvin.johnson@....com>

<snip>

> > Introduce phylink_fwnode_phy_connect API to connect the PHY using
> > fwnode.
> >
> > Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> > ---
> >
> >  drivers/net/phy/phylink.c | 64
> +++++++++++++++++++++++++++++++++++++++
> >  include/linux/phylink.h   |  2 ++
> >  2 files changed, 66 insertions(+)
> >
> > diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> > index ee7a718662c6..f211f62283b5 100644
> > --- a/drivers/net/phy/phylink.c
> > +++ b/drivers/net/phy/phylink.c
> > @@ -18,6 +18,7 @@
> >  #include <linux/spinlock.h>
> >  #include <linux/timer.h>
> >  #include <linux/workqueue.h>
> > +#include <linux/acpi.h>
> >
> >  #include "sfp.h"
> >  #include "swphy.h"
> > @@ -817,6 +818,69 @@ int phylink_connect_phy(struct phylink *pl,
> > struct phy_device *phy)  }  EXPORT_SYMBOL_GPL(phylink_connect_phy);
> >
> > +/**
> > + * phylink_fwnode_phy_connect() - connect the PHY specified in the
> fwnode.
> > + * @pl: a pointer to a &struct phylink returned from phylink_create()
> > + * @dn: a pointer to a &struct device_node.
> > + * @flags: PHY-specific flags to communicate to the PHY device driver
> > + *
> > + * Connect the phy specified in the device node @dn to the phylink
> > +instance
> > + * specified by @pl. Actions specified in phylink_connect_phy() will
> > +be
> > + * performed.
> > + *
> > + * Returns 0 on success or a negative errno.
> > + */
> > +int phylink_fwnode_phy_connect(struct phylink *pl,
> > +                            struct fwnode_handle *fwnode,
> > +                            u32 flags) {
> > +     struct fwnode_handle *phy_node;
> > +     struct phy_device *phy_dev;
> > +     int ret;
> > +     int status;
> > +     struct fwnode_reference_args args;
> > +
> > +     /* Fixed links and 802.3z are handled without needing a PHY */
> > +     if (pl->link_an_mode == MLO_AN_FIXED ||
> > +         (pl->link_an_mode == MLO_AN_INBAND &&
> > +          phy_interface_mode_is_8023z(pl->link_interface)))
> > +             return 0;
> > +
> > +     status = acpi_node_get_property_reference(fwnode, "phy-handle", 0,
> > +                                               &args);
> > +     if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode))
> > +             status = acpi_node_get_property_reference(fwnode, "phy", 0,
> > +                                                       &args);
> > +     if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode))
> > +             status = acpi_node_get_property_reference(fwnode,
> > +                                                       "phy-device", 0,
> > +                                                       &args);
> 
> This is a copy-and-paste of phylink_of_phy_connect() without much thought.
> 
> There is no need to duplicate the legacy DT functionality of phy/phy-
> device/phy-handle in ACPI - there is no legacy to support, so it's pointless
> trying to find one of three properties here.

Ok. I'll remove it.

> I'd prefer both the DT and ACPI variants to be more integrated, so we don't
> have two almost identical functions except for the firmware specific detail.

Did you mean phylink_of_phy_connect replaced with phylink_fwnode_phy_connect?
I can add DT handling also inside phylink_fwnode_phy_connect. Please let me know.

Thanks for pointing out about adding linux-acpi ML. I started added them in my responses.
I was assuming they would be added by get_maintainer.pl. 

Thanks
Calvin