linux-kernel - Re: [PATCH v2 net-next 7/9] net: korina: Add support for device tree

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Date:   Wed, 14 Apr 2021 11:33:25 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next 7/9] net: korina: Add support for device tree



On 4/14/2021 8:29 AM, Thomas Bogendoerfer wrote:
> If there is no mac address passed via platform data try to get it via
> device tree and fall back to a random mac address, if all fail.
> 
> Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> ---
>  drivers/net/ethernet/korina.c | 29 ++++++++++++++++++++++++++---
>  1 file changed, 26 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
> index 69c8baa87a6e..c4590b2c65aa 100644
> --- a/drivers/net/ethernet/korina.c
> +++ b/drivers/net/ethernet/korina.c
> @@ -42,6 +42,8 @@
>  #include <linux/interrupt.h>
>  #include <linux/ioport.h>
>  #include <linux/in.h>
> +#include <linux/of_device.h>
> +#include <linux/of_net.h>
>  #include <linux/slab.h>
>  #include <linux/string.h>
>  #include <linux/delay.h>
> @@ -1056,7 +1058,7 @@ static const struct net_device_ops korina_netdev_ops = {
>  
>  static int korina_probe(struct platform_device *pdev)
>  {
> -	u8 *mac_addr = dev_get_platdata(&pdev->dev);
> +	const u8 *mac_addr = dev_get_platdata(&pdev->dev);
>  	struct korina_private *lp;
>  	struct net_device *dev;
>  	void __iomem *p;
> @@ -1069,7 +1071,15 @@ static int korina_probe(struct platform_device *pdev)
>  	SET_NETDEV_DEV(dev, &pdev->dev);
>  	lp = netdev_priv(dev);
>  
> -	memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
> +	if (mac_addr) {
> +		ether_addr_copy(dev->dev_addr, mac_addr);
> +	} else {
> +		mac_addr = of_get_mac_address(pdev->dev.of_node);
> +		if (!IS_ERR(mac_addr))
> +			ether_addr_copy(dev->dev_addr, mac_addr);
> +		else
> +			eth_hw_addr_random(dev);
> +	}
>  
>  	lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
>  	lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
> @@ -1149,8 +1159,21 @@ static int korina_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_OF
> +static const struct of_device_id korina_match[] = {
> +	{
> +		.compatible = "korina",
> +	},

If you add Device Tree, you might as well provide a binding document for
this controller and possibly pick up a better name than what this driver
had to begin with (in hindsight rb532 is also a bad name since it was
just one board instance), how about using idt,rc32434-emac or something
along these lines?
-- 
Florian