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Date:   Thu, 23 Nov 2017 13:09:37 +1000
From:   Andrew Cooks <>
To:     Jean Delvare <>
Cc:     Andrew Cooks <>,
        Wolfram Sang <>, (open list:I2C/SMBUS CONTROLLER DRIVERS FOR
        PC), (open list)
Subject: [PATCH 1/2] i2c: add ACPI support for i2c-piix4

This enables the i2c-piix4 SMBus controller driver to enumerate I2C
slave devices using ACPI. It builds on the related I2C mux device work
in commit 8eb5c87a92c0 ("i2c: add ACPI support for I2C mux ports")

Signed-off-by: Andrew Cooks <>
 drivers/i2c/busses/i2c-piix4.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 174579d..9260cfa 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -837,6 +837,12 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
 	/* set up the sysfs linkage to our parent device */
 	adap->dev.parent = &dev->dev;
+	if (has_acpi_companion(&dev->dev)) {
+		acpi_preset_companion(&adap->dev,
+				      ACPI_COMPANION(&dev->dev),
+				      port);
+	}
 	snprintf(adap->name, sizeof(adap->name),
 		"SMBus PIIX4 adapter%s at %04x", name, smba);

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