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Subject: media: v4l2: i2c: ov7670: Implement OF mbus configuration
Author:  Jacopo Mondi <jacopo+rene...@jmondi.org>
Date:    Wed Jan 24 04:30:50 2018 -0500

ov7670 driver supports two optional properties supplied through platform
data, but currently does not support any standard video interface
property.

Add support through OF parsing for 2 generic properties (vsync and hsync
polarities) and for one custom property already supported through
platform data to suppress pixel clock output during horizontal
blanking.

While at there, check return value of register writes in set_fmt
function and rationalize spacings.

Signal polarities and pixel clock blanking verified through scope and
image capture.

Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/i2c/Kconfig  |  1 +
 drivers/media/i2c/ov7670.c | 98 +++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 85 insertions(+), 14 deletions(-)

---

diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 26549f765536..ef2e1dea253b 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -692,6 +692,7 @@ config VIDEO_OV7670
        tristate "OmniVision OV7670 sensor support"
        depends on I2C && VIDEO_V4L2
        depends on MEDIA_CAMERA_SUPPORT
+       select V4L2_FWNODE
        ---help---
          This is a Video4Linux2 sensor-level driver for the OmniVision
          OV7670 VGA camera.  It currently only works with the M88ALP01
diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
index 31b0c33cfc5b..3474ef832c1e 100644
--- a/drivers/media/i2c/ov7670.c
+++ b/drivers/media/i2c/ov7670.c
@@ -21,6 +21,7 @@
 #include <linux/gpio/consumer.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ctrls.h>
+#include <media/v4l2-fwnode.h>
 #include <media/v4l2-mediabus.h>
 #include <media/v4l2-image-sizes.h>
 #include <media/i2c/ov7670.h>
@@ -242,6 +243,7 @@ struct ov7670_info {
        struct clk *clk;
        struct gpio_desc *resetb_gpio;
        struct gpio_desc *pwdn_gpio;
+       unsigned int mbus_config;       /* Media bus configuration flags */
        int min_width;                  /* Filter out smaller sizes */
        int min_height;                 /* Filter out smaller sizes */
        int clock_speed;                /* External clock speed (MHz) */
@@ -1014,7 +1016,7 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
        struct v4l2_mbus_framefmt *mbus_fmt;
 #endif
-       unsigned char com7;
+       unsigned char com7, com10 = 0;
        int ret;
 
        if (format->pad)
@@ -1034,7 +1036,6 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
        }
 
        ret = ov7670_try_fmt_internal(sd, &format->format, &ovfmt, &wsize);
-
        if (ret)
                return ret;
        /*
@@ -1045,16 +1046,41 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
         */
        com7 = ovfmt->regs[0].value;
        com7 |= wsize->com7_bit;
-       ov7670_write(sd, REG_COM7, com7);
+       ret = ov7670_write(sd, REG_COM7, com7);
+       if (ret)
+               return ret;
+
+       /*
+        * Configure the media bus through COM10 register
+        */
+       if (info->mbus_config & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+               com10 |= COM10_VS_NEG;
+       if (info->mbus_config & V4L2_MBUS_HSYNC_ACTIVE_LOW)
+               com10 |= COM10_HREF_REV;
+       if (info->pclk_hb_disable)
+               com10 |= COM10_PCLK_HB;
+       ret = ov7670_write(sd, REG_COM10, com10);
+       if (ret)
+               return ret;
+
        /*
         * Now write the rest of the array.  Also store start/stops
         */
-       ov7670_write_array(sd, ovfmt->regs + 1);
-       ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
-                       wsize->vstop);
-       ret = 0;
-       if (wsize->regs)
+       ret = ov7670_write_array(sd, ovfmt->regs + 1);
+       if (ret)
+               return ret;
+
+       ret = ov7670_set_hw(sd, wsize->hstart, wsize->hstop, wsize->vstart,
+                           wsize->vstop);
+       if (ret)
+               return ret;
+
+       if (wsize->regs) {
                ret = ov7670_write_array(sd, wsize->regs);
+               if (ret)
+                       return ret;
+       }
+
        info->fmt = ovfmt;
 
        /*
@@ -1067,8 +1093,10 @@ static int ov7670_set_fmt(struct v4l2_subdev *sd,
         * to write it unconditionally, and that will make the frame
         * rate persistent too.
         */
-       if (ret == 0)
-               ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
+       ret = ov7670_write(sd, REG_CLKRC, info->clkrc);
+       if (ret)
+               return ret;
+
        return 0;
 }
 
@@ -1692,6 +1720,45 @@ static int ov7670_init_gpio(struct i2c_client *client, 
struct ov7670_info *info)
        return 0;
 }
 
+/*
+ * ov7670_parse_dt() - Parse device tree to collect mbus configuration
+ *                     properties
+ */
+static int ov7670_parse_dt(struct device *dev,
+                          struct ov7670_info *info)
+{
+       struct fwnode_handle *fwnode = dev_fwnode(dev);
+       struct v4l2_fwnode_endpoint bus_cfg;
+       struct fwnode_handle *ep;
+       int ret;
+
+       if (!fwnode)
+               return -EINVAL;
+
+       info->pclk_hb_disable = false;
+       if (fwnode_property_present(fwnode, "ov7670,pclk-hb-disable"))
+               info->pclk_hb_disable = true;
+
+       ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
+       if (!ep)
+               return -EINVAL;
+
+       ret = v4l2_fwnode_endpoint_parse(ep, &bus_cfg);
+       if (ret) {
+               fwnode_handle_put(ep);
+               return ret;
+       }
+
+       if (bus_cfg.bus_type != V4L2_MBUS_PARALLEL) {
+               dev_err(dev, "Unsupported media bus type\n");
+               fwnode_handle_put(ep);
+               return ret;
+       }
+       info->mbus_config = bus_cfg.bus.parallel.flags;
+
+       return 0;
+}
+
 static int ov7670_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
 {
@@ -1712,7 +1779,13 @@ static int ov7670_probe(struct i2c_client *client,
 #endif
 
        info->clock_speed = 30; /* default: a guess */
-       if (client->dev.platform_data) {
+
+       if (dev_fwnode(&client->dev)) {
+               ret = ov7670_parse_dt(&client->dev, info);
+               if (ret)
+                       return ret;
+
+       } else if (client->dev.platform_data) {
                struct ov7670_config *config = client->dev.platform_data;
 
                /*
@@ -1779,9 +1852,6 @@ static int ov7670_probe(struct i2c_client *client,
        tpf.denominator = 30;
        info->devtype->set_framerate(sd, &tpf);
 
-       if (info->pclk_hb_disable)
-               ov7670_write(sd, REG_COM10, COM10_PCLK_HB);
-
        v4l2_ctrl_handler_init(&info->hdl, 10);
        v4l2_ctrl_new_std(&info->hdl, &ov7670_ctrl_ops,
                        V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);

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