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From: Stefan Riedmueller <s.riedmueller@phytec.de>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh+dt@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, Christian Hemp <c.hemp@phytec.de>,
	Stefan Riedmueller <s.riedmueller@phytec.de>
Subject: [PATCH v3 2/6] media: mt9p031: Make pixel clock polarity configurable by DT
Date: Fri, 2 Jul 2021 11:59:18 +0200	[thread overview]
Message-ID: <20210702095922.118614-3-s.riedmueller@phytec.de> (raw)
In-Reply-To: <20210702095922.118614-1-s.riedmueller@phytec.de>

From: Christian Hemp <c.hemp@phytec.de>

Evaluate the desired pixel clock polarity from the device tree.

Signed-off-by: Christian Hemp <c.hemp@phytec.de>
Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
---
 drivers/media/i2c/Kconfig   |  1 +
 drivers/media/i2c/mt9p031.c | 20 +++++++++++++++++++-
 include/media/i2c/mt9p031.h |  1 +
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 588f8eb95984..1f9e98be8066 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -1187,6 +1187,7 @@ config VIDEO_MT9P031
 	select MEDIA_CONTROLLER
 	select VIDEO_V4L2_SUBDEV_API
 	select VIDEO_APTINA_PLL
+	select V4L2_FWNODE
 	help
 	  This is a Video4Linux2 sensor driver for the Aptina
 	  (Micron) mt9p031 5 Mpixel camera.
diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
index 3eaaa8d44523..6a6f16df3f4a 100644
--- a/drivers/media/i2c/mt9p031.c
+++ b/drivers/media/i2c/mt9p031.c
@@ -27,6 +27,7 @@
 #include <media/v4l2-async.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
 #include <media/v4l2-subdev.h>
 
 #include "aptina-pll.h"
@@ -398,6 +399,14 @@ static int __mt9p031_set_power(struct mt9p031 *mt9p031, bool on)
 		return ret;
 	}
 
+	/* Configure the pixel clock polarity */
+	if (mt9p031->pdata && mt9p031->pdata->pixclk_pol) {
+		ret = mt9p031_write(client, MT9P031_PIXEL_CLOCK_CONTROL,
+				MT9P031_PIXEL_CLOCK_INVERT);
+		if (ret < 0)
+			return ret;
+	}
+
 	return v4l2_ctrl_handler_setup(&mt9p031->ctrls);
 }
 
@@ -1040,8 +1049,11 @@ static const struct v4l2_subdev_internal_ops mt9p031_subdev_internal_ops = {
 static struct mt9p031_platform_data *
 mt9p031_get_pdata(struct i2c_client *client)
 {
-	struct mt9p031_platform_data *pdata;
+	struct mt9p031_platform_data *pdata = NULL;
 	struct device_node *np;
+	struct v4l2_fwnode_endpoint endpoint = {
+		.bus_type = V4L2_MBUS_PARALLEL
+	};
 
 	if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
 		return client->dev.platform_data;
@@ -1050,6 +1062,9 @@ mt9p031_get_pdata(struct i2c_client *client)
 	if (!np)
 		return NULL;
 
+	if (v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &endpoint) < 0)
+		goto done;
+
 	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		goto done;
@@ -1057,6 +1072,9 @@ mt9p031_get_pdata(struct i2c_client *client)
 	of_property_read_u32(np, "input-clock-frequency", &pdata->ext_freq);
 	of_property_read_u32(np, "pixel-clock-frequency", &pdata->target_freq);
 
+	pdata->pixclk_pol = !!(endpoint.bus.parallel.flags &
+			       V4L2_MBUS_PCLK_SAMPLE_RISING);
+
 done:
 	of_node_put(np);
 	return pdata;
diff --git a/include/media/i2c/mt9p031.h b/include/media/i2c/mt9p031.h
index 7c29c53aa988..f933cd0be8e5 100644
--- a/include/media/i2c/mt9p031.h
+++ b/include/media/i2c/mt9p031.h
@@ -10,6 +10,7 @@ struct v4l2_subdev;
  * @target_freq: Pixel clock frequency
  */
 struct mt9p031_platform_data {
+	unsigned int pixclk_pol:1;
 	int ext_freq;
 	int target_freq;
 };
-- 
2.25.1


  parent reply	other threads:[~2021-07-02  9:59 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-02  9:59 [PATCH v3 0/6] media: mt9p031: Read back the real clock rate Stefan Riedmueller
2021-07-02  9:59 ` [PATCH v3 1/6] " Stefan Riedmueller
2021-07-05  7:13   ` Sakari Ailus
2021-07-05  7:42     ` Stefan Riedmüller
2021-07-02  9:59 ` Stefan Riedmueller [this message]
2021-07-02  9:59 ` [PATCH v3 3/6] dt-bindings: media: mt9p031: Add missing required properties Stefan Riedmueller
2021-07-02 13:15   ` Laurent Pinchart
2021-07-05 15:00     ` Stefan Riedmüller
2021-07-02  9:59 ` [PATCH v3 4/6] dt-bindings: media: mt9p031: add pclk-sample property Stefan Riedmueller
2021-07-02  9:59 ` [PATCH v3 5/6] media: mt9p031: Fix corrupted frame after restarting stream Stefan Riedmueller
2021-07-02  9:59 ` [PATCH v3 6/6] media: mt9p031: Use BIT macro Stefan Riedmueller
2021-07-02 13:13   ` Laurent Pinchart

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