linux-kernel - Re: [alsa-devel] [Patch v6 1/7] slimbus: Device management on SLIMbus

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Date:   Wed, 11 Oct 2017 09:37:41 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, mark.rutland@....com,
        michael.opdenacker@...e-electrons.com, poeschel@...onage.de,
        andreas.noever@...il.com, gong.chen@...ux.intel.com, arnd@...db.de,
        kheitke@...ience.com, bp@...e.de, devicetree@...r.kernel.org,
        james.hogan@...tec.com, pawel.moll@....com,
        linux-arm-msm@...r.kernel.org, sharon.dvir1@...l.huji.ac.il,
        robh+dt@...nel.org, sdharia@...eaurora.org, alan@...ux.intel.com,
        treding@...dia.com, mathieu.poirier@...aro.org, jkosina@...e.cz,
        linux-kernel@...r.kernel.org, daniel@...ll.ch, joe@...ches.com,
        davem@...emloft.net
Subject: Re: [alsa-devel] [Patch v6 1/7] slimbus: Device management on SLIMbus

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?

> >>>>+/**
> >>>>+ * 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?

-- 
~Vinod