media: ov5640: add support of DVP parallel interface

Add support of DVP parallel mode in addition of
existing MIPI CSI mode. The choice between two modes
and configuration is made through device tree.
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/ov5640.c

@@ -34,13 +34,19 @@
 
 #define OV5640_DEFAULT_SLAVE_ID 0x3c
 
+#define OV5640_REG_SYS_CTRL0		0x3008
 #define OV5640_REG_CHIP_ID		0x300a
+#define OV5640_REG_IO_MIPI_CTRL00	0x300e
+#define OV5640_REG_PAD_OUTPUT_ENABLE01	0x3017
+#define OV5640_REG_PAD_OUTPUT_ENABLE02	0x3018
 #define OV5640_REG_PAD_OUTPUT00		0x3019
+#define OV5640_REG_SYSTEM_CONTROL1	0x302e
 #define OV5640_REG_SC_PLL_CTRL0		0x3034
 #define OV5640_REG_SC_PLL_CTRL1		0x3035
 #define OV5640_REG_SC_PLL_CTRL2		0x3036
 #define OV5640_REG_SC_PLL_CTRL3		0x3037
 #define OV5640_REG_SLAVE_ID		0x3100
+#define OV5640_REG_SCCB_SYS_CTRL1	0x3103
 #define OV5640_REG_SYS_ROOT_DIVIDER	0x3108
 #define OV5640_REG_AWB_R_GAIN		0x3400
 #define OV5640_REG_AWB_G_GAIN		0x3402
@@ -70,6 +76,7 @@
 #define OV5640_REG_HZ5060_CTRL01	0x3c01
 #define OV5640_REG_SIGMADELTA_CTRL0C	0x3c0c
 #define OV5640_REG_FRAME_CTRL01		0x4202
+#define OV5640_REG_POLARITY_CTRL00	0x4740
 #define OV5640_REG_MIPI_CTRL00		0x4800
 #define OV5640_REG_DEBUG_MODE		0x4814
 #define OV5640_REG_PRE_ISP_TEST_SET1	0x503d
@@ -982,7 +989,111 @@ static int ov5640_get_gain(struct ov5640_dev *sensor)
 	return gain & 0x3ff;
 }
 
-static int ov5640_set_stream(struct ov5640_dev *sensor, bool on)
+static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
+{
+	int ret;
+	unsigned int flags = sensor->ep.bus.parallel.flags;
+	u8 pclk_pol = 0;
+	u8 hsync_pol = 0;
+	u8 vsync_pol = 0;
+
+	/*
+	 * Note about parallel port configuration.
+	 *
+	 * When configured in parallel mode, the OV5640 will
+	 * output 10 bits data on DVP data lines [9:0].
+	 * If only 8 bits data are wanted, the 8 bits data lines
+	 * of the camera interface must be physically connected
+	 * on the DVP data lines [9:2].
+	 *
+	 * Control lines polarity can be configured through
+	 * devicetree endpoint control lines properties.
+	 * If no endpoint control lines properties are set,
+	 * polarity will be as below:
+	 * - VSYNC:	active high
+	 * - HREF:	active low
+	 * - PCLK:	active low
+	 */
+
+	if (on) {
+		/*
+		 * reset MIPI PCLK/SERCLK divider
+		 *
+		 * SC PLL CONTRL1 0
+		 * - [3..0]:	MIPI PCLK/SERCLK divider
+		 */
+		ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL1, 0x0f, 0);
+		if (ret)
+			return ret;
+
+		/*
+		 * configure parallel port control lines polarity
+		 *
+		 * POLARITY CTRL0
+		 * - [5]:	PCLK polarity (0: active low, 1: active high)
+		 * - [1]:	HREF polarity (0: active low, 1: active high)
+		 * - [0]:	VSYNC polarity (mismatch here between
+		 *		datasheet and hardware, 0 is active high
+		 *		and 1 is active low...)
+		 */
+		if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+			pclk_pol = 1;
+		if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+			hsync_pol = 1;
+		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+			vsync_pol = 1;
+
+		ret = ov5640_write_reg(sensor,
+				       OV5640_REG_POLARITY_CTRL00,
+				       (pclk_pol << 5) |
+				       (hsync_pol << 1) |
+				       vsync_pol);
+
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * powerdown MIPI TX/RX PHY & disable MIPI
+	 *
+	 * MIPI CONTROL 00
+	 * 4:	 PWDN PHY TX
+	 * 3:	 PWDN PHY RX
+	 * 2:	 MIPI enable
+	 */
+	ret = ov5640_write_reg(sensor,
+			       OV5640_REG_IO_MIPI_CTRL00, on ? 0x18 : 0);
+	if (ret)
+		return ret;
+
+	/*
+	 * enable VSYNC/HREF/PCLK DVP control lines
+	 * & D[9:6] DVP data lines
+	 *
+	 * PAD OUTPUT ENABLE 01
+	 * - 6:		VSYNC output enable
+	 * - 5:		HREF output enable
+	 * - 4:		PCLK output enable
+	 * - [3:0]:	D[9:6] output enable
+	 */
+	ret = ov5640_write_reg(sensor,
+			       OV5640_REG_PAD_OUTPUT_ENABLE01,
+			       on ? 0x7f : 0);
+	if (ret)
+		return ret;
+
+	/*
+	 * enable D[5:0] DVP data lines
+	 *
+	 * PAD OUTPUT ENABLE 02
+	 * - [7:2]:	D[5:0] output enable
+	 */
+	return ov5640_write_reg(sensor,
+				OV5640_REG_PAD_OUTPUT_ENABLE02,
+				on ? 0xfc : 0);
+}
+
+static int ov5640_set_stream_mipi(struct ov5640_dev *sensor, bool on)
 {
 	int ret;
 
@@ -1604,17 +1715,19 @@ static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
 		if (ret)
 			goto power_off;
 
+		if (sensor->ep.bus_type == V4L2_MBUS_CSI2) {
 			/*
 			 * start streaming briefly followed by stream off in
 			 * order to coax the clock lane into LP-11 state.
 			 */
-		ret = ov5640_set_stream(sensor, true);
+			ret = ov5640_set_stream_mipi(sensor, true);
 			if (ret)
 				goto power_off;
 			usleep_range(1000, 2000);
-		ret = ov5640_set_stream(sensor, false);
+			ret = ov5640_set_stream_mipi(sensor, false);
 			if (ret)
 				goto power_off;
+		}
 
 		return 0;
 	}
@@ -2188,7 +2301,11 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)
 				goto out;
 		}
 
-		ret = ov5640_set_stream(sensor, enable);
+		if (sensor->ep.bus_type == V4L2_MBUS_CSI2)
+			ret = ov5640_set_stream_mipi(sensor, enable);
+		else
+			ret = ov5640_set_stream_dvp(sensor, enable);
+
 		if (!ret)
 			sensor->streaming = enable;
 	}
@@ -2301,11 +2418,6 @@ static int ov5640_probe(struct i2c_client *client,
 		return ret;
 	}
 
-	if (sensor->ep.bus_type != V4L2_MBUS_CSI2) {
-		dev_err(dev, "invalid bus type, must be MIPI CSI2\n");
-		return -EINVAL;
-	}
-
 	/* get system clock (xclk) */
 	sensor->xclk = devm_clk_get(dev, "xclk");
 	if (IS_ERR(sensor->xclk)) {