linux-kernel - Re: subdevice config into pointer (was Re: [PATCH 1/4] v4l2: device_register_subdev

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Date:   Sat, 4 Mar 2017 00:24:01 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     sre@...nel.org, pali.rohar@...il.com, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, laurent.pinchart@...asonboard.com,
        mchehab@...nel.org, ivo.g.dimitrov.75@...il.com
Subject: Re: subdevice config into pointer (was Re: [PATCH 1/4] v4l2:
 device_register_subdev_nodes: allow calling multiple times)

Hi!

> > > > > Making the sub-device bus configuration a pointer should be in a separate
> > > > > patch. It makes sense since the entire configuration is not valid for all
> > > > > sub-devices attached to the ISP anymore. I think it originally was a
> > > > > separate patch, but they probably have been merged at some point. I can't
> > > > > find it right now anyway.
> > > > 
> > > > Something like this?
> > > > 
> > > > commit df9141c66678b549fac9d143bd55ed0b242cf36e
> > > > Author: Pavel <pavel@....cz>
> > > > Date:   Wed Mar 1 13:27:56 2017 +0100
> > > > 
> > > >     Turn bus in struct isp_async_subdev into pointer; some of our subdevs
> > > >     (flash, focus) will not need bus configuration.
> > > > 
> > > > Signed-off-by: Pavel Machek <pavel@....cz>
> > > 
> > > I applied this to the ccp2 branch with an improved patch
> > > description.
> > 
> > Thanks!
> > 
> > [But the important part is to get subdevices to work on ccp2 based
> > branch, and it still fails to work at all if I attempt to enable
> > them. I'd like to understand why...]
> 
> Did you add the flash / lens to the async list? The patches currently in the
> ccp branch do not include that --- it should be in parsing the flash /
> lens-focus properties in omap3isp device's node.

I retried, and it fails different way than I assumed. I might be able
to debug this one as sensor (and mplayer) still works.

Best regards,
								Pavel

--

    This is what subdevs support should look like, I guess; but I don't
    know fwnode stuff well enough.
    
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index c80397a..36bd359 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -2166,6 +2166,8 @@ static int isp_fwnodes_parse(struct device *dev,
 			     struct v4l2_async_notifier *notifier)
 {
 	struct fwnode_handle *fwn = NULL;
+	struct device_node *node;
+	int flash = 0;
 
 	notifier->subdevs = devm_kcalloc(
 		dev, ISP_MAX_SUBDEVS, sizeof(*notifier->subdevs), GFP_KERNEL);
@@ -2199,6 +2201,42 @@ static int isp_fwnodes_parse(struct device *dev,
 		notifier->num_subdevs++;
 	}
 
+	printk("Going through camera-flashes\n");
+	while (notifier->num_subdevs < ISP_MAX_SUBDEVS) {
+	       /* FIXME: fwnode_graph_get_remote_endpoint()
+	       (fwn = fwnode_graph_get_next_endpoint(device_fwnode_handle(dev), fwn, ))  */
+		struct isp_async_subdev *isd;
+
+		node = of_parse_phandle(dev->of_node, "ti,camera-flashes", flash++);
+		flash++;
+		if (!node)
+			break;
+
+		printk("Having subdevice: %p\n", node);
+		
+#if 1
+		isd = devm_kzalloc(dev, sizeof(*isd), GFP_KERNEL);
+		if (!isd)
+			goto error;
+
+		notifier->subdevs[notifier->num_subdevs] = &isd->asd;
+
+
+		isd->asd.match.of.node = node;
+		if (!isd->asd.match.of.node) {
+			dev_warn(dev, "bad remote port parent\n");
+			goto error;
+		}
+
+		isd->asd.match_type = V4L2_ASYNC_MATCH_OF;
+		notifier->num_subdevs++;
+#endif
+	}
+
+
+	if (notifier->num_subdevs == ISP_MAX_SUBDEVS) {
+		printk("isp: Maybe too many devices?\n");
+	}
 	return notifier->num_subdevs;
 
 error:


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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