From 047119e3cd631624e04cf251cbafe13bef3f6373 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Wed, 13 Aug 2025 00:45:25 +0300 Subject: [PATCH] media: i2c: imx319: Use V4L2 sensor clock helper Several camera sensor drivers access the "clock-frequency" property directly to retrieve the external clock rate, or modify the clock rate of the external clock programmatically. Both behaviours are valid on a subset of ACPI platforms, but are considered deprecated on OF platforms, and do not support ACPI platforms that implement MIPI DisCo for Imaging. Implementing them manually in drivers is deprecated, as that can encourage cargo-cult and lead to differences in behaviour between drivers. Instead, drivers should use the devm_v4l2_sensor_clk_get() helper. This driver supports ACPI platforms only. It retrieves the clock rate from the "clock-frequency" property. If the rate does not match the expected rate, the driver fails probing. This is correct behaviour for ACPI. Switch to using the devm_v4l2_sensor_clk_get() helper. This does not change the behaviour on ACPI platforms that specify a clock-frequency property and don't provide a clock. On ACPI platforms that provide a clock, the clock rate will be set to the value of the clock-frequency property. This should not change the behaviour either as this driver expects the clock to be set to that rate, and wouldn't operate correctly otherwise. Signed-off-by: Laurent Pinchart Signed-off-by: Sakari Ailus Reviewed-by: Mehdi Djait Signed-off-by: Hans Verkuil --- drivers/media/i2c/imx319.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/media/i2c/imx319.c b/drivers/media/i2c/imx319.c index f404d053873ce..953310ef30460 100644 --- a/drivers/media/i2c/imx319.c +++ b/drivers/media/i2c/imx319.c @@ -2,6 +2,7 @@ // Copyright (C) 2018 Intel Corporation #include +#include #include #include #include @@ -107,7 +108,6 @@ struct imx319_mode { }; struct imx319_hwcfg { - u32 ext_clk; /* sensor external clk */ unsigned long link_freq_bitmap; }; @@ -2347,20 +2347,6 @@ static struct imx319_hwcfg *imx319_get_hwcfg(struct device *dev) if (!cfg) goto out_err; - ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency", - &cfg->ext_clk); - if (ret) { - dev_err(dev, "can't get clock frequency"); - goto out_err; - } - - dev_dbg(dev, "ext clk: %d", cfg->ext_clk); - if (cfg->ext_clk != IMX319_EXT_CLK) { - dev_err(dev, "external clock %d is not supported", - cfg->ext_clk); - goto out_err; - } - ret = v4l2_link_freq_to_bitmap(dev, bus_cfg.link_frequencies, bus_cfg.nr_of_link_frequencies, link_freq_menu_items, @@ -2382,6 +2368,8 @@ out_err: static int imx319_probe(struct i2c_client *client) { struct imx319 *imx319; + unsigned long freq; + struct clk *clk; bool full_power; int ret; @@ -2393,6 +2381,17 @@ static int imx319_probe(struct i2c_client *client) mutex_init(&imx319->mutex); + clk = devm_v4l2_sensor_clk_get(imx319->dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(imx319->dev, PTR_ERR(clk), + "failed to acquire clock\n"); + + freq = clk_get_rate(clk); + if (freq != IMX319_EXT_CLK) + return dev_err_probe(imx319->dev, -EINVAL, + "external clock %lu is not supported", + freq); + /* Initialize subdev */ v4l2_i2c_subdev_init(&imx319->sd, client, &imx319_subdev_ops); -- 2.47.3