netdev - Re: [patch net-next 05/11] net: hns: add uniform interface for phy connection

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Date:	Fri, 13 May 2016 16:07:25 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Yisen Zhuang <Yisen.Zhuang@...wei.com>, davem@...emloft.net,
	rjw@...ysocki.net, lenb@...nel.org
Cc:	arnd@...db.de, andrew@...n.ch, geliangtang@....com,
	ivecera@...hat.com, fengguang.wu@...el.com,
	charles.chenxin@...wei.com, haifeng.wei@...wei.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxarm@...wei.com
Subject: Re: [patch net-next 05/11] net: hns: add uniform interface for phy
 connection

On Fri, 2016-05-13 at 16:19 +0800, Yisen Zhuang wrote:
> From: Kejian Yan <yankejian@...wei.com>
> 
> As device_node is only used by OF case, HNS needs to treat the others
> cases including ACPI. It needs to use uniform ways to handle both of
> OF and ACPI. This patch chooses phy_device, and of_phy_connect and
> of_phy_attach are only used by OF case. It needs to add uniform
> interface
> to handle that sequence by both OF and ACPI.

--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> @@ -987,6 +987,41 @@ static void hns_nic_adjust_link(struct net_device
> *ndev)
>  	h->dev->ops->adjust_link(h, ndev->phydev->speed, ndev-
> >phydev->duplex);
>  }
>  
> +static
> +struct phy_device *hns_nic_phy_attach(struct net_device *dev,
> +				      struct phy_device *phy,
> +				      u32 flags,
> +				      phy_interface_t iface)
> +{
> +	int ret;
> +
> +	if (!phy)
> +		return NULL;

No need to use defensive programming here.

> +
> +	ret = phy_attach_direct(dev, phy, flags, iface);
> +
> +	return ret ? NULL : phy;

Shouldn't it return an error?


> +}
> +
> +static
> +struct phy_device *hns_nic_phy_connect(struct net_device *dev,
> +				       struct phy_device *phy,
> +				       void (*hndlr)(struct
> net_device *),
> +				       u32 flags,
> +				       phy_interface_t iface)
> +{
> +	int ret;
> +
> +	if (!phy)
> +		return NULL;
> +
> +	phy->dev_flags = flags;
> +
> +	ret = phy_connect_direct(dev, phy, hndlr, iface);
> +
> +	return ret ? NULL : phy;
> +}
> +

For now looks that above functions are redundant and you may call them
directly in below code.

>  /**
>   *hns_nic_init_phy - init phy
>   *@...v: net device
> @@ -996,16 +1031,17 @@ static void hns_nic_adjust_link(struct
> net_device *ndev)
>  int hns_nic_init_phy(struct net_device *ndev, struct hnae_handle *h)
>  {
>  	struct hns_nic_priv *priv = netdev_priv(ndev);
> -	struct phy_device *phy_dev = NULL;
> +	struct phy_device *phy_dev = h->phy_dev;
>  
> -	if (!h->phy_node)
> +	if (!h->phy_dev)
>  		return 0;
>  
>  	if (h->phy_if != PHY_INTERFACE_MODE_XGMII)
> -		phy_dev = of_phy_connect(ndev, h->phy_node,
> -					 hns_nic_adjust_link, 0, h-
> >phy_if);
> +		phy_dev = hns_nic_phy_connect(ndev, phy_dev,
> +					      hns_nic_adjust_link,
> +					      0, h->phy_if);
>  	else
> -		phy_dev = of_phy_attach(ndev, h->phy_node, 0, h-
> >phy_if);
> +		phy_dev = hns_nic_phy_attach(ndev, phy_dev, 0, h-
> >phy_if);


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy