The clk and regulator frameworks expect clk/regulator consumer-devices to have info about the consumed clks/regulators described in the device's fw_node. To work around cases where this info is not present in the firmware tables, which is often the case on x86/ACPI devices, both frameworks allow the provider-driver to attach info about consumers to the clks/regulators when registering these. This causes problems with the probe ordering of the ov8865 driver vs the drivers for these clks/regulators. Since the lookups are only registered when the provider-driver binds, trying to get these clks/regulators before then results in a -ENOENT error for clks and a dummy regulator for regs. On ACPI/x86 where this is a problem, the ov8865 ACPI fw-nodes have a _DEP dependency on the INT3472 ACPI fw-node which describes the hardware which provides the clks/regulators. The drivers/platform/x86/intel/int3472/ code dealing with these ACPI fw-nodes will call acpi_dev_clear_dependencies() to indicate that this _DEP has been "met" when all the clks/regulators have been setup. Call the has_unmet_acpi_deps() helper to check for unmet _DEPs and return -EPROBE_DEFER if this returns true, so that we wait for the clk/regulator setup to be done before continuing with probing. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> --- drivers/media/i2c/ov8865.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c index ce4e0ae2c4d3..fd18d1256f78 100644 --- a/drivers/media/i2c/ov8865.c +++ b/drivers/media/i2c/ov8865.c @@ -2978,6 +2978,9 @@ static int ov8865_probe(struct i2c_client *client) unsigned int i; int ret; + if (has_unmet_acpi_deps(dev)) + return -EPROBE_DEFER; + sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); if (!sensor) return -ENOMEM; -- 2.31.1
