[PATCH v2 06/10] media: ar0521: Add LINK_FREQ control

[Jacopo Mondi <jacopo@jmondi.org>]

Add support for V4L2_CID_LINK_FREQ which currently reports a single
hard-coded frequency which depends on the fixed pixel clock.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
---
 drivers/media/i2c/ar0521.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/media/i2c/ar0521.c b/drivers/media/i2c/ar0521.c
index fcd852760750..2310346f11d5 100644
--- a/drivers/media/i2c/ar0521.c
+++ b/drivers/media/i2c/ar0521.c
@@ -89,6 +89,10 @@ static const char * const ar0521_supply_names[] = {
 	"vaa",		/* Analog (2.7V) supply */
 };
 
+static const s64 ar0521_link_frequencies[] = {
+	184000000,
+};
+
 struct ar0521_ctrls {
 	struct v4l2_ctrl_handler handler;
 	struct {
@@ -547,6 +551,13 @@ static int ar0521_s_ctrl(struct v4l2_ctrl *ctrl)
 		ret = ar0521_write_reg(sensor, AR0521_REG_TEST_PATTERN_MODE,
 				       ctrl->val);
 		break;
+	case V4L2_CID_LINK_FREQ:
+		/*
+		 * Link frequency index is used at PLL configuration time,
+		 * nothing to do here.
+		 */
+		ret = 0;
+		break;
 	default:
 		dev_err(&sensor->i2c_client->dev,
 			"Unsupported control %x\n", ctrl->id);
@@ -611,6 +622,10 @@ static int ar0521_init_controls(struct ar0521_dev *sensor)
 	ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE, 0,
 					    65535, 1, 360);
 
+	v4l2_ctrl_new_int_menu(hdl, ops, V4L2_CID_LINK_FREQ,
+			       ARRAY_SIZE(ar0521_link_frequencies) - 1,
+			       0, ar0521_link_frequencies);
+
 	ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(hdl, ops,
 					V4L2_CID_TEST_PATTERN,
 					ARRAY_SIZE(test_pattern_menu) - 1,
-- 
2.37.3