linux-kernel - Re: [PATCH net-next v2 3/3] enetc: Add ENETC PF level external MDIO support

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Message-ID: <20190215133459.GH5699@lunn.ch>
Date:   Fri, 15 Feb 2019 14:34:59 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Claudiu Manoil <claudiu.manoil@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        "David S . Miller" <davem@...emloft.net>,
        alexandru.marginean@....com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 3/3] enetc: Add ENETC PF level external MDIO
 support

On Fri, Feb 15, 2019 at 12:10:14PM +0200, Claudiu Manoil wrote:
> Each ENETC PF has its own MDIO interface, the corresponding
> MDIO registers are mapped in the ENETC's Port register block.
> The current patch adds a driver for these PF level MDIO buses,
> so that each PF can manage directly its own external link.
> 
> Signed-off-by: Alex Marginean <alexandru.marginean@....com>
> Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
> ---
> v2 - used readx_poll_timeout()
>    - added mdio node child to the port node

Hi Claudiu

Please document this in the device tree binding.

> +	/* return all Fs if nothing was there */
> +	if (enetc_rd_reg(&regs->mdio_cfg) & MDIO_CFG_RD_ER) {
> +		dev_err(&bus->dev,
> +			"Error while reading PHY%d reg at %d.%hhu\n",
> +			phy_id, dev_addr, regnum);
> +		return 0xffff;

I'm not sure you want a dev_err() here. The device tree binding allows
you to have a phy node without a reg value. When that happens, the
core code will scan all 32 addresses to find the PHY. This is going to
spam the log. dev_dbg() might be better.

     Andrew