netdev - Re: [PATCH 1/2] net/cadence/macb: add support for dt phy definition

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Message-ID: <5216359F.8000603@overkiz.com>
Date:	Thu, 22 Aug 2013 18:00:31 +0200
From:	boris brezillon <b.brezillon@...rkiz.com>
To:	Florian Fainelli <f.fainelli@...il.com>
CC:	Boris BREZILLON <b.brezillon@...rkiz.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Russell King <linux@....linux.org.uk>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] net/cadence/macb: add support for dt phy definition

Hello Florian,

On 22/08/2013 17:57, Boris BREZILLON wrote:
> The macb driver only handle PHY description through platform_data
> (macb_platform_data).
> Thus, when using dt you cannot define phy properties like phy address or
> phy irq pin.
>
> This patch makes use of the of_mdiobus_register to add support for
> phy device definition using dt.
> A fallback to the autoscan procedure is added in case there is no phy
> devices defined in dt.
>
> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
> ---
>   drivers/net/ethernet/cadence/macb.c |   41 +++++++++++++++++++++++++++++------
>   1 file changed, 34 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index e866608..fe06ab0 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -27,6 +27,7 @@
>   #include <linux/phy.h>
>   #include <linux/of.h>
>   #include <linux/of_device.h>
> +#include <linux/of_mdio.h>
>   #include <linux/of_net.h>
>   #include <linux/pinctrl/consumer.h>
>   
> @@ -314,6 +315,7 @@ static int macb_mii_probe(struct net_device *dev)
>   int macb_mii_init(struct macb *bp)
>   {
>   	struct macb_platform_data *pdata;
> +	struct device_node *np;
>   	int err = -ENXIO, i;
>   
>   	/* Enable management port */
> @@ -335,21 +337,46 @@ int macb_mii_init(struct macb *bp)
>   	bp->mii_bus->parent = &bp->dev->dev;
>   	pdata = bp->pdev->dev.platform_data;
>   
> -	if (pdata)
> -		bp->mii_bus->phy_mask = pdata->phy_mask;
> -
>   	bp->mii_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
>   	if (!bp->mii_bus->irq) {
>   		err = -ENOMEM;
>   		goto err_out_free_mdiobus;
>   	}
>   
> -	for (i = 0; i < PHY_MAX_ADDR; i++)
> -		bp->mii_bus->irq[i] = PHY_POLL;
> -
>   	dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
>   
> -	if (mdiobus_register(bp->mii_bus))
> +	np = bp->pdev->dev.of_node;
> +	if (np) {
> +		/* try dt phy registration */
> +		err = of_mdiobus_register(bp->mii_bus, np);
> +
> +		/* fallback to standard phy registration if no phy were
> +		   found during dt phy registration */
> +		if (!err && !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)) {
> +					err = PTR_ERR(phydev);
> +					break;
> +				}
> +			}
> +

This is were I need the mdiobus_full_scan function.

> +			if (err)
> +				goto err_out_unregister_bus;
> +		}
> +	} 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;
> +
> +		err = mdiobus_register(bp->mii_bus);
> +	}
> +
> +	if (err)
>   		goto err_out_free_mdio_irq;
>   
>   	if (macb_mii_probe(bp->dev) != 0) {

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