media: i2c: imx290: Add support for the mono sensor variant

The IMX290 module is available as either mono or colour (Bayer).

Update the driver so that it can advertise the correct mono
formats instead of the colour ones.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/imx290.c

@@ -13,6 +13,7 @@
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
@@ -160,6 +161,21 @@
 
 #define IMX290_NUM_SUPPLIES				3
 
+enum imx290_colour_variant {
+	IMX290_VARIANT_COLOUR,
+	IMX290_VARIANT_MONO,
+	IMX290_VARIANT_MAX
+};
+
+enum imx290_model {
+	IMX290_MODEL_IMX290LQR,
+	IMX290_MODEL_IMX290LLR,
+};
+
+struct imx290_model_info {
+	enum imx290_colour_variant colour_variant;
+};
+
 struct imx290_regval {
 	u32 reg;
 	u32 val;
@@ -180,6 +196,7 @@ struct imx290 {
 	struct clk *xclk;
 	struct regmap *regmap;
 	u8 nlanes;
+	const struct imx290_model_info *model;
 
 	struct v4l2_subdev sd;
 	struct media_pad pad;
@@ -417,7 +434,7 @@ static inline int imx290_modes_num(const struct imx290 *imx290)
 }
 
 struct imx290_format_info {
-	u32 code;
+	u32 code[IMX290_VARIANT_MAX];
 	u8 bpp;
 	const struct imx290_regval *regs;
 	unsigned int num_regs;
@@ -425,26 +442,33 @@ struct imx290_format_info {
 
 static const struct imx290_format_info imx290_formats[] = {
 	{
-		.code = MEDIA_BUS_FMT_SRGGB10_1X10,
+		.code = {
+			[IMX290_VARIANT_COLOUR] = MEDIA_BUS_FMT_SRGGB10_1X10,
+			[IMX290_VARIANT_MONO] = MEDIA_BUS_FMT_Y10_1X10
+		},
 		.bpp = 10,
 		.regs = imx290_10bit_settings,
 		.num_regs = ARRAY_SIZE(imx290_10bit_settings),
 	}, {
-		.code = MEDIA_BUS_FMT_SRGGB12_1X12,
+		.code = {
+			[IMX290_VARIANT_COLOUR] = MEDIA_BUS_FMT_SRGGB12_1X12,
+			[IMX290_VARIANT_MONO] = MEDIA_BUS_FMT_Y12_1X12
+		},
 		.bpp = 12,
 		.regs = imx290_12bit_settings,
 		.num_regs = ARRAY_SIZE(imx290_12bit_settings),
 	}
 };
 
-static const struct imx290_format_info *imx290_format_info(u32 code)
+static const struct imx290_format_info *
+imx290_format_info(const struct imx290 *imx290, u32 code)
 {
 	unsigned int i;
 
 	for (i = 0; i < ARRAY_SIZE(imx290_formats); ++i) {
 		const struct imx290_format_info *info = &imx290_formats[i];
 
-		if (info->code == code)
+		if (info->code[imx290->model->colour_variant] == code)
 			return info;
 	}
 
@@ -541,7 +565,7 @@ static int imx290_set_black_level(struct imx290 *imx290,
 				  const struct v4l2_mbus_framefmt *format,
 				  unsigned int black_level, int *err)
 {
-	unsigned int bpp = imx290_format_info(format->code)->bpp;
+	unsigned int bpp = imx290_format_info(imx290, format->code)->bpp;
 
 	return imx290_write(imx290, IMX290_BLKLEVEL,
 			    black_level >> (16 - bpp), err);
@@ -553,7 +577,7 @@ static int imx290_setup_format(struct imx290 *imx290,
 	const struct imx290_format_info *info;
 	int ret;
 
-	info = imx290_format_info(format->code);
+	info = imx290_format_info(imx290, format->code);
 
 	ret = imx290_set_register_array(imx290, info->regs, info->num_regs);
 	if (ret < 0) {
@@ -654,7 +678,7 @@ static void imx290_ctrl_update(struct imx290 *imx290,
 
 	/* pixel rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
 	pixel_rate = link_freq * 2 * imx290->nlanes;
-	do_div(pixel_rate, imx290_format_info(format->code)->bpp);
+	do_div(pixel_rate, imx290_format_info(imx290, format->code)->bpp);
 
 	__v4l2_ctrl_s_ctrl(imx290->link_freq, mode->link_freq_index);
 	__v4l2_ctrl_s_ctrl_int64(imx290->pixel_rate, pixel_rate);
@@ -849,10 +873,12 @@ static int imx290_enum_mbus_code(struct v4l2_subdev *sd,
 				 struct v4l2_subdev_state *sd_state,
 				 struct v4l2_subdev_mbus_code_enum *code)
 {
+	const struct imx290 *imx290 = to_imx290(sd);
+
 	if (code->index >= ARRAY_SIZE(imx290_formats))
 		return -EINVAL;
 
-	code->code = imx290_formats[code->index].code;
+	code->code = imx290_formats[code->index].code[imx290->model->colour_variant];
 
 	return 0;
 }
@@ -864,7 +890,7 @@ static int imx290_enum_frame_size(struct v4l2_subdev *sd,
 	const struct imx290 *imx290 = to_imx290(sd);
 	const struct imx290_mode *imx290_modes = imx290_modes_ptr(imx290);
 
-	if (!imx290_format_info(fse->code))
+	if (!imx290_format_info(imx290, fse->code))
 		return -EINVAL;
 
 	if (fse->index >= imx290_modes_num(imx290))
@@ -893,8 +919,8 @@ static int imx290_set_fmt(struct v4l2_subdev *sd,
 	fmt->format.width = mode->width;
 	fmt->format.height = mode->height;
 
-	if (!imx290_format_info(fmt->format.code))
-		fmt->format.code = imx290_formats[0].code;
+	if (!imx290_format_info(imx290, fmt->format.code))
+		fmt->format.code = imx290_formats[0].code[imx290->model->colour_variant];
 
 	fmt->format.field = V4L2_FIELD_NONE;
 
@@ -1182,6 +1208,15 @@ static s64 imx290_check_link_freqs(const struct imx290 *imx290,
 	return 0;
 }
 
+static const struct imx290_model_info imx290_models[] = {
+	[IMX290_MODEL_IMX290LQR] = {
+		.colour_variant = IMX290_VARIANT_COLOUR,
+	},
+	[IMX290_MODEL_IMX290LLR] = {
+		.colour_variant = IMX290_VARIANT_MONO,
+	},
+};
+
 static int imx290_parse_dt(struct imx290 *imx290)
 {
 	/* Only CSI2 is supported for now: */
@@ -1192,6 +1227,8 @@ static int imx290_parse_dt(struct imx290 *imx290)
 	int ret;
 	s64 fq;
 
+	imx290->model = of_device_get_match_data(imx290->dev);
+
 	endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(imx290->dev), NULL);
 	if (!endpoint) {
 		dev_err(imx290->dev, "Endpoint node not found\n");
@@ -1357,8 +1394,18 @@ static void imx290_remove(struct i2c_client *client)
 }
 
 static const struct of_device_id imx290_of_match[] = {
-	{ .compatible = "sony,imx290" },
-	{ /* sentinel */ }
+	{
+		/* Deprecated - synonym for "sony,imx290lqr" */
+		.compatible = "sony,imx290",
+		.data = &imx290_models[IMX290_MODEL_IMX290LQR],
+	}, {
+		.compatible = "sony,imx290lqr",
+		.data = &imx290_models[IMX290_MODEL_IMX290LQR],
+	}, {
+		.compatible = "sony,imx290llr",
+		.data = &imx290_models[IMX290_MODEL_IMX290LLR],
+	},
+	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, imx290_of_match);