linux-kernel - [PATCH v7 01/17] media: v4l2-fwnode: ignore endpoints that have no remote port parent

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Date:   Sat, 29 Sep 2018 11:40:36 -0700
From:   Steve Longerbeam <steve_longerbeam@...tor.com>
To:     <linux-media@...r.kernel.org>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Sebastian Reichel <sre@...nel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH v7 01/17] media: v4l2-fwnode: ignore endpoints that have no remote port parent

Documentation/devicetree/bindings/media/video-interfaces.txt states that
the 'remote-endpoint' property is optional.

So v4l2_async_notifier_fwnode_parse_endpoint() should not return error
if the endpoint has no remote port parent. Just ignore the endpoint,
skip adding an asd to the notifier and return 0.
__v4l2_async_notifier_parse_fwnode_endpoints() will then continue
parsing the remaining port endpoints of the device.

Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
Acked-by: Hans Verkuil <hans.verkuil@...co.com>
---
Changes since v6:
- none
Changes since v5:
- none
Changes since v4:
- none
Changes since v3:
- none
Changes since v2:
- none
Changes since v1:
- don't pass an empty endpoint to the parse_endpoint callback,
  v4l2_async_notifier_fwnode_parse_endpoint() now just ignores them
  and returns success. The current users of
  v4l2_async_notifier_parse_fwnode_endpoints() (omap3isp, rcar-vin,
  intel-ipu3) no longer need modification.
---
 drivers/media/v4l2-core/v4l2-fwnode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index 169bdbb1f61a..0b8c736b1606 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -367,7 +367,7 @@ static int v4l2_async_notifier_fwnode_parse_endpoint(
 		fwnode_graph_get_remote_port_parent(endpoint);
 	if (!asd->match.fwnode) {
 		dev_warn(dev, "bad remote port parent\n");
-		ret = -EINVAL;
+		ret = -ENOTCONN;
 		goto out_err;
 	}
 
-- 
2.17.1