netdev - Re: [PATCH v5] net/phy: micrel: Add OF configuration support for ksz9021

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Date:	Tue, 20 Aug 2013 11:17:20 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Sean Cross <xobs@...agi.com>
Cc:	Duan Fugang-B38611 <B38611@...escale.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v5] net/phy: micrel: Add OF configuration support for
 ksz9021

On Mon, Aug 05, 2013 at 07:04:08AM +0000, Sean Cross wrote:
> Some boards require custom PHY configuration, for example due to trace
> length differences.  Add the ability to configure these registers in
> order to get the PHY to function on boards that need it.
> 
> Because PHYs are auto-detected based on MDIO device IDs, allow PHY
> configuration to be specified in the parent Ethernet device node if no
> PHY device node is present.
> 
> Signed-off-by: Sean Cross <xobs@...agi.com>
> ---
>  .../devicetree/bindings/net/micrel-ksz9021.txt     |   49 ++++++++++
>  drivers/net/phy/micrel.c                           |  101 +++++++++++++++++++-
>  2 files changed, 149 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/net/micrel-ksz9021.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/micrel-ksz9021.txt b/Documentation/devicetree/bindings/net/micrel-ksz9021.txt
> new file mode 100644
> index 0000000..338a7e2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/micrel-ksz9021.txt
> @@ -0,0 +1,49 @@
> +Micrel KSZ9021 Gigabit Ethernet PHY
> +
> +Some boards require special tuning values, particularly when it comes to
> +clock delays.  You can specify clock delay values by adding
> +micrel-specific properties to an Ethernet OF device node.
> +
> +All skew control options are specified in picoseconds.  The minimum
> +value is 0, and the maximum value is 3000.
> +
> +Optional properties:
> + - rxc-skew : Skew control of RXC pad
> + - rxdv-skew : Skew control of RX CTL pad
> + - txc-skew : Skew control of TXC pad
> + - txen-skew : Skew control of TX_CTL pad
> + - rxd0-skew : Skew control of RX data 0 pad
> + - rxd1-skew : Skew control of RX data 1 pad
> + - rxd2-skew : Skew control of RX data 2 pad
> + - rxd3-skew : Skew control of RX data 3 pad
> + - txd0-skew : Skew control of TX data 0 pad
> + - txd1-skew : Skew control of TX data 1 pad
> + - txd2-skew : Skew control of TX data 2 pad
> + - txd3-skew : Skew control of TX data 3 pad
> +
> +Examples:
> +
> +	/* Attach to an Ethernet device with autodetected PHY */
> +	&enet {
> +		rxc-skew = <3000>; // picoseconds
> +		rxdv-skew = <0>;   // picoseconds
> +		txc-skew = <3000>; // picoseconds
> +		txen-skew = <0>;   // picoseconds

I prefer to add a -ps suffix to the property names. This makes the
comments unnecessary and provides the unit information automatically
where it is needed.

> +	if (val1 != -1)
> +		newval = ((newval & 0xfff0) | ((val1/200)&0xf) << 0);

Please add whitespaces at both sides os operators as required in
Documentation/CodingStyle.

Otherwise:

Reviewed-by: Sascha Hauer <s.hauer@...gutronix.de>

Sascha

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