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Date:   Sun, 10 Oct 2021 20:56:58 +0200
From:   Hans de Goede <>
To:     "Rafael J . Wysocki" <>,
        Mark Gross <>,
        Andy Shevchenko <>,
        Wolfram Sang <>,
        Mika Westerberg <>,
        Daniel Scally <>,
        Laurent Pinchart <>,
        Mauro Carvalho Chehab <>,
        Liam Girdwood <>,
        Mark Brown <>,
        Michael Turquette <>,
        Stephen Boyd <>
Cc:     Hans de Goede <>, Len Brown <>,,,,,
        Sakari Ailus <>,
        Kate Hsuan <>,,
Subject: [PATCH v3 02/11] i2c: acpi: Use acpi_dev_ready_for_enumeration() helper

The clk and regulator frameworks expect clk/regulator consumer-devices
to have info about the consumed clks/regulators described in the device's

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 wrt drivers for consumers
of 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 regulators.

To ensure the correct probe-ordering the ACPI core has code to defer the
enumeration of consumers affected by this until the providers are ready.

Call the new acpi_dev_ready_for_enumeration() helper to avoid
enumerating / instantiating i2c-clients too early.

Signed-off-by: Hans de Goede <>
 drivers/i2c/i2c-core-acpi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index aaeeacc12121..688cc71d650d 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -144,9 +144,12 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
 	struct list_head resource_list;
 	int ret;
-	if (acpi_bus_get_status(adev) || !adev->status.present)
+	if (acpi_bus_get_status(adev))
 		return -EINVAL;
+	if (!acpi_dev_ready_for_enumeration(adev))
+		return -ENODEV;
 	if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0)
 		return -ENODEV;

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