netdev - Re: [PATCH v4 08/18] net: davinci_emac: potentially get the MAC address from MTD

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Message-ID: <20180704070919.GA14051@lenoch>
Date:   Wed, 4 Jul 2018 09:09:19 +0200
From:   Ladislav Michl <ladis@...ux-mips.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Lukas Wunner <lukas@...ner.de>, Rob Herring <robh@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        David Lechner <david@...hnology.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Lunn <andrew@...n.ch>, Jonathan Corbet <corbet@....net>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v4 08/18] net: davinci_emac: potentially get the MAC
 address from MTD

On Tue, Jul 03, 2018 at 09:39:51AM -0700, Florian Fainelli wrote:
> 
> 
> On 06/29/2018 02:40 AM, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > 
> > On da850-evm board we can read the MAC address from MTD. It's currently
> > done in the relevant board file, but we want to get rid of all the MAC
> > reading callbacks from the board file (SPI and NAND). Move the reading
> > of the MAC address from SPI to the emac driver's probe function.
> 
> This should be made something generic to all drivers, not just something
> the davinci_emac driver does, something like this actually:
> 
> https://lkml.org/lkml/2018/3/24/312

...and that's would also make it work when MAC address is stored
in 24c08 EEPROM, which is quite common.

> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > ---
> >  drivers/net/ethernet/ti/davinci_emac.c | 20 ++++++++++++++++++--
> >  1 file changed, 18 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
> > index a1a6445b5a7e..48e6a7755811 100644
> > --- a/drivers/net/ethernet/ti/davinci_emac.c
> > +++ b/drivers/net/ethernet/ti/davinci_emac.c
> > @@ -67,7 +67,7 @@
> >  #include <linux/of_irq.h>
> >  #include <linux/of_net.h>
> >  #include <linux/mfd/syscon.h>
> > -
> > +#include <linux/mtd/mtd.h>
> >  #include <asm/irq.h>
> >  #include <asm/page.h>
> >  
> > @@ -1783,7 +1783,10 @@ static int davinci_emac_probe(struct platform_device *pdev)
> >  	struct cpdma_params dma_params;
> >  	struct clk *emac_clk;
> >  	unsigned long emac_bus_frequency;
> > -
> > +#ifdef CONFIG_MTD
> > +	size_t mac_addr_len;
> > +	struct mtd_info *mtd;
> > +#endif /* CONFIG_MTD */
> >  
> >  	/* obtain emac clock from kernel */
> >  	emac_clk = devm_clk_get(&pdev->dev, NULL);
> > @@ -1815,6 +1818,19 @@ static int davinci_emac_probe(struct platform_device *pdev)
> >  		goto err_free_netdev;
> >  	}
> >  
> > +#ifdef CONFIG_MTD
> > +	mtd = get_mtd_device_nm("MAC-Address");
> > +	if (!IS_ERR(mtd)) {
> > +		rc = mtd_read(mtd, 0, ETH_ALEN,
> > +			      &mac_addr_len, priv->mac_addr);
> > +		if (rc == 0)
> > +			dev_info(&pdev->dev,
> > +				 "Read MAC addr from SPI Flash: %pM\n",
> > +				 priv->mac_addr);
> > +		put_mtd_device(mtd);
> > +	}
> > +#endif /* CONFIG_MTD */
> > +
> >  	/* MAC addr and PHY mask , RMII enable info from platform_data */
> >  	memcpy(priv->mac_addr, pdata->mac_addr, ETH_ALEN);
> >  	priv->phy_id = pdata->phy_id;
> > 
> 
> -- 
> Florian
> --
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