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From:   Steve Longerbeam <slongerbeam@gmail.com>
To:     linux-media@vger.kernel.org
Cc:     Steve Longerbeam <steve_longerbeam@mentor.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Sebastian Reichel <sre@kernel.org>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        =?UTF-8?q?Niklas=20S=C3=B6derlund?= 
        <niklas.soderlund+renesas@ragnatech.se>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v6 01/17] media: v4l2-fwnode: ignore endpoints that have no remote port parent
Date:   Mon,  9 Jul 2018 15:39:01 -0700
Message-Id: <1531175957-1973-2-git-send-email-steve_longerbeam@mentor.com>
In-Reply-To: <1531175957-1973-1-git-send-email-steve_longerbeam@mentor.com>
References: <1531175957-1973-1-git-send-email-steve_longerbeam@mentor.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@mentor.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
---
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 3f77aa3..3240c2a 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -363,7 +363,7 @@ 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;
 	}
 
-- 
2.7.4