Ything-RepoMirrors/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-01-25 07:47:50 +00:00
Code Issues Packages Projects Releases Wiki Activity

media: i2c: gc08a3: Use V4L2 legacy sensor clock helper

Browse Source 
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 copying deprecated behaviour for OF platforms in new drivers,
and lead to differences in behaviour between drivers. Instead, drivers
that need to preserve the deprecated OF behaviour should use the
devm_v4l2_sensor_clk_get_legacy() helper.

This driver supports OF platforms only. The "clocks" and
"clock-frequency" properties were initially mandatory in the DT bindings
and were both set in the upstream DT sources. The driver retrieves the
clock, retrieves and ignores the clock rate from the clock-frequency
property, and sets the clock rate to a fixed value. This is deprecated
behaviour for OF.

Switch to using the devm_v4l2_sensor_clk_get_legacy() helper. This
preserves setting the clock rate on OF platforms. Should support for OF
platforms that set the clock rate through clock-frequency be considered
unneeded in the future, the driver will only need to switch to
devm_v4l2_sensor_clk_get() without any other change.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Mehdi Djait <mehdi.djait@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Laurent Pinchart
2025-08-13 00:45:57 +03:00
committed by Mauro Carvalho Chehab
parent 30dbc53167
commit d2d7488bf5
1 changed files with 2 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/media/i2c/gc08a3.c
View File

@@ -1199,16 +1199,12 @@ static int gc08a3_probe(struct i2c_client *client)
return dev_err_probe(dev, PTR_ERR(gc08a3->regmap),
"failed to init CCI\n");
gc08a3->xclk = devm_v4l2_sensor_clk_get(dev, NULL);
gc08a3->xclk = devm_v4l2_sensor_clk_get_legacy(dev, NULL, true,
GC08A3_DEFAULT_CLK_FREQ);
if (IS_ERR(gc08a3->xclk))
return dev_err_probe(dev, PTR_ERR(gc08a3->xclk),
"failed to get xclk\n");
ret = clk_set_rate(gc08a3->xclk, GC08A3_DEFAULT_CLK_FREQ);
if (ret)
return dev_err_probe(dev, ret,
"failed to set xclk frequency\n");
ret = gc08a3_get_regulators(dev, gc08a3);
if (ret < 0)
return dev_err_probe(dev, ret,