[PATCH] netdev/phy: skip disabled mdio-mux nodes
David Daney
ddaney.cavm at gmail.com
Wed Aug 8 02:59:25 EST 2012
On 08/07/2012 09:51 AM, Timur Tabi wrote:
> The mdio-mux driver scans all child mdio nodes, without regard to whether
> the node is actually used. Some device trees include all possible
> mdio-mux nodes and rely on the boot loader to disable those that are not
> present, based on some run-time configuration. Those nodes need to be
> skipped.
>
> Signed-off-by: Timur Tabi<timur at freescale.com>
> ---
> drivers/net/phy/mdio-mux.c | 9 +++++++++
> 1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
> index 5c12018..d0c231e 100644
> --- a/drivers/net/phy/mdio-mux.c
> +++ b/drivers/net/phy/mdio-mux.c
> @@ -135,6 +135,15 @@ int mdio_mux_init(struct device *dev,
> for_each_child_of_node(dev->of_node, child_bus_node) {
> u32 v;
>
> + /*
> + * Some device trees include all possible mdio-mux nodes and
> + * rely on the boot loader to disable those that are not
> + * present, based on some run-time configuration. Those nodes
> + * need to be skipped.
> + */
> + if (!of_device_is_available(child_bus_node))
> + continue;
Although this will get the job done, I don't think it is the cleanest
approach.
Would it be better to create a new iterator
(for_each_available_child_of_node perhaps) that skips the unavailable
nodes? This seems like a general problem that is not restricted to mdio
multiplexers.
David Daney
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