netdev - Re: [PATCH v2 2/2] phy dp83867: Make rgmii parameters optional

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Date:	Mon, 16 May 2016 12:04:04 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Alexander Graf <agraf@...e.de>, netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, michal.simek@...inx.com,
	Dan Murphy <dmurphy@...com>, andrew@...n.ch
Subject: Re: [PATCH v2 2/2] phy dp83867: Make rgmii parameters optional

On 05/16/2016 11:52 AM, Alexander Graf wrote:
> If you compile without OF_MDIO support in an RGMII configuration, we fail
> to configure the dp83867 phy today by writing garbage into its configuration
> registers.
> 
> On the other hand if you do compile with OF_MDIO and the phy gets loaded via
> device tree, you have to have the properties set in the device tree, otherwise
> we fail to load the driver and don't even attach the generic phy driver to
> the interface anymore.
> 
> To make things slightly more consistent, make the rgmii configuration properties
> optional and allow a user to omit them in their device tree.
> 
> Signed-off-by: Alexander Graf <agraf@...e.de>
> ---
>  drivers/net/phy/dp83867.c | 31 ++++++++++++++++++++++++++++---
>  1 file changed, 28 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
> index 94cc278..1b01680 100644
> --- a/drivers/net/phy/dp83867.c
> +++ b/drivers/net/phy/dp83867.c
> @@ -65,6 +65,7 @@ struct dp83867_private {
>  	int rx_id_delay;
>  	int tx_id_delay;
>  	int fifo_depth;
> +	int values_are_sane;

This could be a boolean type.

>  };
>  
>  static int dp83867_ack_interrupt(struct phy_device *phydev)
> @@ -113,15 +114,30 @@ static int dp83867_of_init(struct phy_device *phydev)
>  	ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
>  				   &dp83867->rx_id_delay);
>  	if (ret)
> -		return ret;
> +		goto invalid_dt;
>  
>  	ret = of_property_read_u32(of_node, "ti,tx-internal-delay",
>  				   &dp83867->tx_id_delay);
>  	if (ret)
> -		return ret;
> +		goto invalid_dt;
>  
> -	return of_property_read_u32(of_node, "ti,fifo-depth",
> +	ret = of_property_read_u32(of_node, "ti,fifo-depth",
>  				   &dp83867->fifo_depth);
> +	if (ret)
> +		goto invalid_dt;
> +
> +	dp83867->values_are_sane = 1;
> +
> +	return 0;
> +
> +invalid_dt:
> +	phydev_err(phydev, "missing properties in device tree");

phydev_warn() maybe?

Other than that, this looks okay to me.
-- 
Florian