linux-kernel - [PATCH v1 41/55] media: i2c: ov8865: Use the v4l2 helper for obtaining the clock

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Message-ID: <273d77cc78cbe9fd144f96e68407f0f7b41d3895.1750352394.git.mehdi.djait@linux.intel.com>
Date: Thu, 19 Jun 2025 19:59:34 +0200
From: Mehdi Djait <mehdi.djait@...ux.intel.com>
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Subject: [PATCH v1 41/55] media: i2c: ov8865: Use the v4l2 helper for obtaining the clock

devm_clk_get() fails on ACPI-based platforms, where firmware does not
provide a direct reference to the clock producer.

Replace devm_clk_get() with the new v4l2 helper
devm_v4l2_sensor_clk_get() that works on both DT- and ACPI-based
platforms to retrieve a reference to the clock producer from firmware.

Signed-off-by: Mehdi Djait <mehdi.djait@...ux.intel.com>

diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c
index 95ffe7536aa6..5cc278c3e169 100644
--- a/drivers/media/i2c/ov8865.c
+++ b/drivers/media/i2c/ov8865.c
@@ -2956,7 +2956,6 @@ static int ov8865_probe(struct i2c_client *client)
 	struct ov8865_sensor *sensor;
 	struct v4l2_subdev *subdev;
 	struct media_pad *pad;
-	unsigned int rate = 0;
 	unsigned int i;
 	int ret;
 
@@ -3019,39 +3018,14 @@ static int ov8865_probe(struct i2c_client *client)
 
 	/* External Clock */
 
-	sensor->extclk = devm_clk_get(dev, NULL);
-	if (PTR_ERR(sensor->extclk) == -ENOENT) {
-		dev_info(dev, "no external clock found, continuing...\n");
-		sensor->extclk = NULL;
-	} else if (IS_ERR(sensor->extclk)) {
+	sensor->extclk = devm_v4l2_sensor_clk_get(dev, NULL);
+	if (IS_ERR(sensor->extclk)) {
 		dev_err(dev, "failed to get external clock\n");
 		ret = PTR_ERR(sensor->extclk);
 		goto error_endpoint;
 	}
 
-	/*
-	 * We could have either a 24MHz or 19.2MHz clock rate from either dt or
-	 * ACPI...but we also need to support the weird IPU3 case which will
-	 * have an external clock AND a clock-frequency property. Check for the
-	 * clock-frequency property and if found, set that rate if we managed
-	 * to acquire a clock. This should cover the ACPI case. If the system
-	 * uses devicetree then the configured rate should already be set, so
-	 * we can just read it.
-	 */
-	ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
-				       &rate);
-	if (!ret && sensor->extclk) {
-		ret = clk_set_rate(sensor->extclk, rate);
-		if (ret) {
-			dev_err_probe(dev, ret, "failed to set clock rate\n");
-			goto error_endpoint;
-		}
-	} else if (ret && !sensor->extclk) {
-		dev_err_probe(dev, ret, "invalid clock config\n");
-		goto error_endpoint;
-	}
-
-	sensor->extclk_rate = rate ? rate : clk_get_rate(sensor->extclk);
+	sensor->extclk_rate = clk_get_rate(sensor->extclk);
 
 	for (i = 0; i < ARRAY_SIZE(supported_extclk_rates); i++) {
 		if (sensor->extclk_rate == supported_extclk_rates[i])