linux-kernel - Re: [PATCH 1/3] netdev/phy: Handle IEEE802.3 clause 45 Ethernet PHYs

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Date:	Wed, 12 Oct 2011 18:21:11 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	David Daney <david.daney@...ium.com>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, davem@...emloft.net, afleming@...il.com
Subject: Re: [PATCH 1/3] netdev/phy: Handle IEEE802.3 clause 45 Ethernet PHYs

On Wed, Oct 12, 2011 at 11:06:21AM -0700, David Daney wrote:
> The IEEE802.3 clause 45 MDIO bus protocol allows for directly
> addressing PHY registers using a 21 bit address, and is used by many
> 10G Ethernet PHYS.  Already existing is the ability of MDIO bus
> drivers to use clause 45, with the MII_ADDR_C45 flag.  Here we add
> some support in the PHY and device tree infrastructure to use these
> PHYs.
> 
> Normally the MII_ADDR_C45 flag is ORed with the register address to
> indicate a clause 45 transaction.  Here we also use this flag in the
> *device* address passed to get_phy_id() and get_phy_device() to
> indicate that probing should be done with clause 45 transactions.  If
> a PHY is successfully probed with MII_ADDR_C45, the new struct
> phy_device is_c45 flag is set for the PHY.
> 
> Signed-off-by: David Daney <david.daney@...ium.com>

Minor comment below, but otherwise,

Acked-by: Grant Likely <grant.likely@...retlab.ca>

> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index e4c3844..0a25e2c 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -246,6 +246,7 @@ struct sk_buff;
>   * phy_id: UID for this device found during discovery
>   * state: state of the PHY for management purposes
>   * dev_flags: Device-specific flags used by the PHY driver.
> + * is_c45:  Set to 1 if this phy uses clause 45 addressing.

"Set to true if ..."

>   * addr: Bus address of PHY
>   * link_timeout: The number of timer firings to wait before the
>   * giving up on the current attempt at acquiring a link
> @@ -283,6 +284,8 @@ struct phy_device {
>  
>  	u32 dev_flags;
>  
> +	unsigned int is_c45:1;
> +

bool

>  	phy_interface_t interface;
>  
>  	/* Bus address of the PHY (0-31) */
> -- 
> 1.7.2.3
> 
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