Date:   Wed, 18 Oct 2017 19:23:59 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH net-next v2 2/2] net: ethernet: socionext: add AVE ethernet driver

On Mon, 16 Oct 2017 00:08:21 +0900 <yamada.masahiro@...ionext.com> wrote:

> 2017-10-13 9:35 GMT+09:00 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>:
> > +static int ave_probe(struct platform_device *pdev)
> > +{
> > +       struct device *dev = &pdev->dev;
> > +       struct device_node *np = dev->of_node;
> > +       u32 ave_id;
> > +       struct ave_private *priv;
> > +       const struct ave_soc_data *data;
> > +       phy_interface_t phy_mode;
> > +       struct net_device *ndev;
> > +       struct resource *res;
> > +       void __iomem *base;
> > +       int irq, ret = 0;
> > +       char buf[ETHTOOL_FWVERS_LEN];
> > +       const void *mac_addr;
> > +
> > +       data = of_device_get_match_data(dev);
> > +       if (WARN_ON(!data))
> > +               return -EINVAL;
> > +
> > +       phy_mode = of_get_phy_mode(np);
> > +       if (phy_mode < 0) {
> > +               dev_err(dev, "phy-mode not found\n");
> > +               return -EINVAL;
> > +       }
> > +       if ((!phy_interface_mode_is_rgmii(phy_mode)) &&
> > +           phy_mode != PHY_INTERFACE_MODE_RMII &&
> > +           phy_mode != PHY_INTERFACE_MODE_MII) {
> > +               dev_err(dev, "phy-mode is invalid\n");
> > +               return -EINVAL;
> > +       }
> > +
> > +       irq = platform_get_irq(pdev, 0);
> > +       if (irq < 0) {
> > +               dev_err(dev, "IRQ not found\n");
> > +               return irq;
> > +       }
> > +
> > +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +       base = devm_ioremap_resource(dev, res);
> > +       if (IS_ERR(base))
> > +               return PTR_ERR(base);
> > +
> > +       /* alloc netdevice */
> > +       ndev = alloc_etherdev(sizeof(struct ave_private));
> > +       if (!ndev) {
> > +               dev_err(dev, "can't allocate ethernet device\n");
> > +               return -ENOMEM;
> > +       }
> > +
> > +       ndev->netdev_ops = &ave_netdev_ops;
> > +       ndev->ethtool_ops = &ave_ethtool_ops;
> > +       SET_NETDEV_DEV(ndev, dev);
> > +
> > +       /* support hardware checksum */
> > +       ndev->features    |= (NETIF_F_IP_CSUM | NETIF_F_RXCSUM);
> > +       ndev->hw_features |= (NETIF_F_IP_CSUM | NETIF_F_RXCSUM);
> > +
> > +       ndev->max_mtu = AVE_MAX_ETHFRAME - (ETH_HLEN + ETH_FCS_LEN);
> > +
> > +       /* get mac address */
> > +       mac_addr = of_get_mac_address(np);
> > +       if (mac_addr)
> > +               ether_addr_copy(ndev->dev_addr, mac_addr);
> > +
> > +       /* if the mac address is invalid, use random mac address */
> > +       if (!is_valid_ether_addr(ndev->dev_addr)) {
> > +               eth_hw_addr_random(ndev);
> > +               dev_warn(dev, "Using random MAC address: %pM\n",
> > +                        ndev->dev_addr);
> > +       }
> > +
> > +       priv = netdev_priv(ndev);
> > +       priv->base = base;
> > +       priv->irq = irq;
> > +       priv->ndev = ndev;
> > +       priv->msg_enable = netif_msg_init(-1, AVE_DEFAULT_MSG_ENABLE);
> > +       priv->phy_mode = phy_mode;
> > +       priv->data = data;
> > +
> > +       if (IS_DESC_64BIT(priv)) {
> > +               priv->desc_size = AVE_DESC_SIZE_64;
> > +               priv->tx.daddr  = AVE_TXDM_64;
> > +               priv->rx.daddr  = AVE_RXDM_64;
> > +       } else {
> > +               priv->desc_size = AVE_DESC_SIZE_32;
> > +               priv->tx.daddr  = AVE_TXDM_32;
> > +               priv->rx.daddr  = AVE_RXDM_32;
> > +       }
> > +       priv->tx.ndesc = AVE_NR_TXDESC;
> > +       priv->rx.ndesc = AVE_NR_RXDESC;
> > +
> > +       u64_stats_init(&priv->stats_rx.syncp);
> > +       u64_stats_init(&priv->stats_tx.syncp);
> > +
> > +       /* get clock */
> 
> Please remove this super-obvious comment.

I'll check comments out and remove them unnecessary.

> > +       priv->clk = clk_get(dev, NULL);
> 
> Missing clk_put() in the failure path.
> 
> Why don't you use devm?
> 
> 
> 
> > +       if (IS_ERR(priv->clk))
> > +               priv->clk = NULL;
> 
> So, clk is optional, but
> you need to check EPROBE_DEFER.
> 
> 
> 
> 
> > +       /* get reset */
> 
> Remove.
> 
> 
> > +       priv->rst = reset_control_get(dev, NULL);
> > +       if (IS_ERR(priv->rst))
> > +               priv->rst = NULL;
> 
> 
> reset_control_get() is deprecated.  Do not use it in a new driver.
> 
> Again, missing reset_control_put().   devm?
> 
> 
> The reset seems optional (again, ignoring EPROBE_DEFER)
> but you did not use reset_control_get_optional, why?
> 
> From your code, this reset is used as shared.
> 
> 
> priv->rst = devm_reset_control_get_optional_shared(dev, NULL);
> if (IS_ERR(priv->rst))
>           return PTR_ERR(priv->rst);

The clk and reset are optional in the driver.
Referring to your suggested method, I'll fix the part of clk and reset.

> 
> 
> -- 
> Best Regards
> Masahiro Yamada

---
Best Regards,
Kunihiko Hayashi

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