On 11/10/17 05:07, Vinod Koul wrote:
On Tue, Oct 10, 2017 at 06:21:34PM +0100, Srinivas Kandagatla wrote:
On 10/10/17 17:49, Vinod Koul wrote:
+static int slim_device_probe(struct device *dev)
+{
+ struct slim_device *sbdev;
+ struct slim_driver *sbdrv;
+ int status = 0;
+
+ sbdev = to_slim_device(dev);
+ sbdrv = to_slim_driver(dev->driver);
+
+ sbdev->driver = sbdrv;
+
+ if (sbdrv->probe)
+ status = sbdrv->probe(sbdev);
+
+ if (status)
+ sbdev->driver = NULL;
+ else if (sbdrv->device_up)
+ schedule_slim_report(sbdev->ctrl, sbdev, true);
can you please explain what this is trying to do?
It is scheduling a device_up() callback in workqueue for reporting
discovered device.
any reason for that? Would the device not announce itself on the bus and
then you can synchronously update the device.
You are correct, Device should announce itself in all cases. core should
only call this callback only when device is announced, it does not make
sense for this call in slim_device_probe(). Will remove it from here in next
version.
Okay great. Btw do you need a notify being scheduled in those cases? I guess
your controller would get an interrupt and you will handle that in bottom
half and then cll this, so why not call in the bottom half?
That makes sense, I will optimize this path, It looks like there are 2
workqueues in this path. We should be able to get rid of one work-queue.
+/**
+ * slim_register_controller: Controller bring-up and registration.
...
+
+ mutex_init(&ctrl->m_ctrl);
+ ret = device_register(&ctrl->dev);
one more device_register?? Can you explain why
This is a device for each controller.
wont the controller have its own platform_device?
Reason could be that slim_register controller can be called from any code
not just platform devices..
ah which cases would those be. I was expecting that you would have a
platform_device as a slimbus controller which would call slim_register?
As of now there is only one controller which uses platform driver, but
in future there might be more, but this is something which makes the
slimbus core more flexible.
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