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From:   Steve Longerbeam <slongerbeam@gmail.com>
To:     linux-media@vger.kernel.org, Rui Miguel Silva <rmfrfs@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>
Cc:     Steve Longerbeam <slongerbeam@gmail.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        devel@driverdev.osuosl.org (open list:STAGING SUBSYSTEM),
        linux-arm-kernel@lists.infradead.org (moderated list:ARM/FREESCALE IMX
        / MXC ARM ARCHITECTURE), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v3 03/17] media: imx: csi: Implement get_fwnode_pad op
Date:   Tue,  4 Feb 2020 15:49:04 -0800
Message-Id: <20200204234918.20425-4-slongerbeam@gmail.com>
In-Reply-To: <20200204234918.20425-1-slongerbeam@gmail.com>
References: <20200204234918.20425-1-slongerbeam@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The CSI does not have a 1:1 relationship between fwnode port numbers and
pad indexes. In fact the CSI fwnode device is itself a port which is the
sink, containing only a single fwnode endpoint. Implement media_entity
operation get_fwnode_pad to first verify the given endpoint is the CSI's
sink endpoint, and if so return the CSI sink pad index.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index b60ed4f22f6d..dc5fe25fe7b8 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1825,9 +1825,32 @@ static void csi_unregistered(struct v4l2_subdev *sd)
 		ipu_csi_put(priv->csi);
 }
 
+/*
+ * The CSI has only one fwnode endpoint, at the sink pad. Verify the
+ * endpoint belongs to us, and return CSI_SINK_PAD.
+ */
+static int csi_get_fwnode_pad(struct media_entity *entity,
+			      struct fwnode_endpoint *endpoint)
+{
+	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+	struct fwnode_handle *csi_port = dev_fwnode(priv->dev);
+	struct fwnode_handle *csi_ep;
+	int ret;
+
+	csi_ep = fwnode_get_next_child_node(csi_port, NULL);
+
+	ret = endpoint->local_fwnode == csi_ep ? CSI_SINK_PAD : -ENXIO;
+
+	fwnode_handle_put(csi_ep);
+
+	return ret;
+}
+
 static const struct media_entity_operations csi_entity_ops = {
 	.link_setup = csi_link_setup,
 	.link_validate = v4l2_subdev_link_validate,
+	.get_fwnode_pad = csi_get_fwnode_pad,
 };
 
 static const struct v4l2_subdev_core_ops csi_core_ops = {
-- 
2.17.1