Hi,
On Tuesday 04 June 2013 07:13 PM, Sylwester Nawrocki wrote:
Hi,
On 06/04/2013 02:26 PM, Kishon Vijay Abraham I wrote:
+static inline int phy_init(struct phy *phy)
+{
+ pm_runtime_get_sync(&phy->dev);
Hmm, no need to check return value here ? Also it looks a bit unexpected to
I purposely dint check the return values in order to support platforms
that don’t enable pm_runtime.
Then I guess this should be called conditionally and any errors returned
if runtime PM is enabled ? Not sure if pm_runtime_enabled() would be
helpful such situation.
Indeed. I think it can be used.
possibly have runtime_resume callback of a PHY device called before ops->init()
call ? It seems a bit unclear what the purpose of init() callback is.
Not really. Anything that is used to initialize the PHY (internal
configuration) can go in phy_init. Usually in runtime_resume callback,
optional functional clocks are enabled and also in some cases context
restore is done. So it really makes sense to enable clocks/module
(pm_runtime_get_sync) before doing a PHY configuration (phy_init).
OK, that makes sense. All PHY device resources must be prepared anyway
before a PHY object is registered with the PHY core.
+ if (phy->ops->init)
+ return phy->ops->init(phy);
+
+ return -EINVAL;
+}
+
+static inline int phy_exit(struct phy *phy)
+{
+ int ret = -EINVAL;
+
+ if (phy->ops->exit)
+ ret = phy->ops->exit(phy);
+
+ pm_runtime_put_sync(&phy->dev);
+
+ return ret;
+}
Do phy_init/phy_exit need to be mandatory ? What if there is really
No. phy_init/phy_exit is not mandatory at all.
nothing to do in those callbacks ? Perhaps -ENOIOCTLCMD should be
returned if a callback is not implemented, so PHY users can recognize
such situation and proceed ?
So currently these APIs return -EINVAL if these callbacks are not
populated which is good enough IMHO.
But -EINVAL could be well returned from the callback function. Perhaps
ENOTSUPP could be used instead ?
hmm.. could be..
Thanks
Kishon
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