netdev - Re: [PATCH v2 net-next 1/3] net: macb: Reorganize macb

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Date:   Sat, 10 Mar 2018 16:19:20 -0600
From:   Brad Mouring <brad.mouring@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Mark Rutland <mark.rutland@....com>, <netdev@...r.kernel.org>,
        Julia Cartwright <julia@...com>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 net-next 1/3] net: macb: Reorganize macb_mii bringup

Hi Andrew,

On Sat, Mar 10, 2018 at 05:17:18PM +0100, Andrew Lunn wrote:
> On Fri, Mar 09, 2018 at 04:12:31PM -0600, Brad Mouring wrote:
> > The macb mii setup (mii_probe() and mii_init()) previously was
> > somewhat interspersed, likely a result of organic growth and hacking.
> 
> Hi Brad
> 
> For netdev it is normal to include a cover note for patch series,
> which explains the big picture of the series. The cover note is then
> used as the merge commit message.
> 
> > 
> > This change moves mii bus registration into mii_init and probing the
> > bus for devices into mii_probe.
> > 
> > Signed-off-by: Brad Mouring <brad.mouring@...com>
> > Suggested-by: Andrew Lunn <andrew@...n.ch>
> > ---
> >  drivers/net/ethernet/cadence/macb_main.c | 89 ++++++++++++++++----------------
> >  1 file changed, 45 insertions(+), 44 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> > index e84afcf1ecb5..7b69a291ab7a 100644
> > --- a/drivers/net/ethernet/cadence/macb_main.c
> > +++ b/drivers/net/ethernet/cadence/macb_main.c
> > @@ -470,10 +470,48 @@ static void macb_handle_link_change(struct net_device *dev)
> >  static int macb_mii_probe(struct net_device *dev)
> >  {
> >  	struct macb *bp = netdev_priv(dev);
> > -	struct macb_platform_data *pdata;
> > +	struct macb_platform_data *pdata = dev_get_platdata(&bp->pdev->dev);
> >  	struct phy_device *phydev;
> > +	struct device_node *np = bp->pdev->dev.of_node;
> >  	int phy_irq;
> > -	int ret;
> > +	int ret, i;
> 
> These should be in 'Reverse Christmas Tree' order. i.e. longest
> first. That makes pdata tricky, so do the assignment in the body of
> the function.
> 
> > +
> > +	if (np) {
> > +		if (of_phy_is_fixed_link(np)) {
> > +			if (of_phy_register_fixed_link(np) < 0) {
> > +				dev_err(&bp->pdev->dev,
> > +					"broken fixed-link specification\n");
> > +				return -ENODEV;
> > +			}
> > +			bp->phy_node = of_node_get(np);
> > +		} else {
> > +			/* fallback to standard phy registration if no phy were
> > +			 * found during dt phy registration
> > +			 */
> > +			if (!phy_find_first(bp->mii_bus)) {
> > +				for (i = 0; i < PHY_MAX_ADDR; i++) {
> > +					struct phy_device *phydev;
> > +
> > +					phydev = mdiobus_scan(bp->mii_bus, i);
> > +					if (IS_ERR(phydev) &&
> > +					    PTR_ERR(phydev) != -ENODEV) {
> > +						ret = PTR_ERR(phydev);
> > +						break;
> > +					}
> > +				}
> > +
> > +				if (ret)
> > +					return -ENODEV;
> > +			}
> > +		}
> > +	} else {
> > +		for (i = 0; i < PHY_MAX_ADDR; i++)
> > +			bp->mii_bus->irq[i] = PHY_POLL;
> > +
> > +		if (pdata)
> > +			bp->mii_bus->phy_mask = pdata->phy_mask;
> 
> I would say these two are to do with the mdio bus setup. Setting irq
> to POLL is not required, the core will do that. So you could add one
> patch removing that.
> 
>       Andrew

Thank you for the excellent feedback and patience. I've prepped a set
of patches addressing your points, but I'd like to test the changes
on hardware first (both with a DT that calls out the phys and one
that depends on default discovery) prior to a v3 (with appropriate
cover letter).

Brad