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Date:	Mon, 16 May 2016 08:38:20 -0500
From:	Dan Murphy <dmurphy@...com>
To:	Alexander Graf <agraf@...e.de>, <netdev@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <michal.simek@...inx.com>
Subject: Re: [PATCH] phy dp83867: depend on CONFIG_OF_MDIO

Alexander

On 05/16/2016 06:28 AM, Alexander Graf wrote:
> The DP83867 phy driver doesn't actually work when CONFIG_OF_MDIO isn't enabled.
> It simply passes the device tree test, but leaves all internal configuration
> initialized at 0. Then it configures the phy with those values and renders a
> previously working configuration useless.
>
> This patch makes sure that we only build the DP83867 phy code when
> CONFIG_OF_MDIO is set, to not run into that problem.
>
> Signed-off-by: Alexander Graf <agraf@...e.de>
> ---
>  drivers/net/phy/Kconfig   | 1 +
>  drivers/net/phy/dp83867.c | 7 -------
>  2 files changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 6dad9a9..4265ad5 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -148,6 +148,7 @@ config DP83848_PHY
>  
>  config DP83867_PHY
>  	tristate "Drivers for Texas Instruments DP83867 Gigabit PHY"
> +	depends on OF_MDIO
>  	---help---
>  	  Currently supports the DP83867 PHY.
>  
> diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
> index 2afa61b..ff867ba 100644
> --- a/drivers/net/phy/dp83867.c
> +++ b/drivers/net/phy/dp83867.c
> @@ -99,7 +99,6 @@ static int dp83867_config_intr(struct phy_device *phydev)
>  	return phy_write(phydev, MII_DP83867_MICR, micr_status);
>  }
>  
> -#ifdef CONFIG_OF_MDIO
>  static int dp83867_of_init(struct phy_device *phydev)
>  {
>  	struct dp83867_private *dp83867 = phydev->priv;
> @@ -123,12 +122,6 @@ static int dp83867_of_init(struct phy_device *phydev)
>  	return of_property_read_u32(of_node, "ti,fifo-depth",
>  				   &dp83867->fifo_depth);
>  }
> -#else
> -static int dp83867_of_init(struct phy_device *phydev)
> -{
> -	return 0;
> -}
> -#endif /* CONFIG_OF_MDIO */
>  
>  static int dp83867_config_init(struct phy_device *phydev)
>  {
I don't think we want this to depend solely on OF_MDIO.

The #else case should probably be coded to look at platform data, if
it exists.  I don't have any boards that still used platform data to test this
out so I did not feel comfortable adding code I could not test.

The platform data should contain the RGMII tx/rx delay and FIFO control.


Dan

-- 
------------------
Dan Murphy

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