linux-kernel - [PATCH v2 07/11] media: exynos4-is: Add support for multiple sensors on one port

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Date:   Thu, 30 Jul 2020 16:01:10 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     kyungmin.park@...sung.com, s.nawrocki@...sung.com,
        mchehab@...nel.org, kgene@...nel.org, krzk@...nel.org,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     devicetree@...r.kernel.org, robh+dt@...nel.org,
        Jonathan Bakker <xc-racer2@...e.ca>
Subject: [PATCH v2 07/11] media: exynos4-is: Add support for multiple sensors on one port

On some devices, there may be multiple camera sensors attached
to the same port.  Make sure we probe all of them, not just the
first one.

Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
---
Changes from v1:
- Separated parsing each endpoint into separate func
---
 drivers/media/platform/exynos4-is/media-dev.c | 28 +++++++++++++------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index 70b0a70840cf..6d9b8fe3ac79 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -394,21 +394,15 @@ static void fimc_md_pipelines_free(struct fimc_md *fmd)
 	}
 }
 
-/* Parse port node and register as a sub-device any sensor specified there. */
-static int fimc_md_parse_port_node(struct fimc_md *fmd,
-				   struct device_node *port)
+static int fimc_md_parse_one_endpoint(struct fimc_md *fmd,
+				   struct device_node *ep)
 {
 	int index = fmd->num_sensors;
 	struct fimc_source_info *pd = &fmd->sensor[index].pdata;
-	struct device_node *rem, *ep, *np;
+	struct device_node *rem, *np;
 	struct v4l2_fwnode_endpoint endpoint = { .bus_type = 0 };
 	int ret;
 
-	/* Assume here a port node can have only one endpoint node. */
-	ep = of_get_next_child(port, NULL);
-	if (!ep)
-		return 0;
-
 	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &endpoint);
 	if (ret) {
 		of_node_put(ep);
@@ -482,6 +476,22 @@ static int fimc_md_parse_port_node(struct fimc_md *fmd,
 	return 0;
 }
 
+/* Parse port node and register as a sub-device any sensor specified there. */
+static int fimc_md_parse_port_node(struct fimc_md *fmd,
+				   struct device_node *port)
+{
+	struct device_node *ep;
+	int ret;
+
+	for_each_child_of_node(port, ep) {
+		ret = fimc_md_parse_one_endpoint(fmd, ep);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
 /* Register all SoC external sub-devices */
 static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
 {
-- 
2.20.1