Re: [PATCH 2/2] i2c: i801: Use new helper acpi_use_parent_companion

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On 16.10.2023 19:32, Rafael J. Wysocki wrote:
> On Mon, Oct 16, 2023 at 6:10 PM Wilczynski, Michal
> <michal.wilczynski@xxxxxxxxx> wrote:
>>
>> Hi,
>>
>> On 10/15/2023 11:36 PM, Heiner Kallweit wrote:
>>> Use new helper acpi_use_parent_companion to simplify the code.
>>>
>>> Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
>>> ---
>>>  drivers/i2c/busses/i2c-i801.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
>>> index a41f5349a..ac223146c 100644
>>> --- a/drivers/i2c/busses/i2c-i801.c
>>> +++ b/drivers/i2c/busses/i2c-i801.c
>>> @@ -1620,7 +1620,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
>>>       priv->adapter.class = I2C_CLASS_HWMON;
>>>       priv->adapter.algo = &smbus_algorithm;
>>>       priv->adapter.dev.parent = &dev->dev;
>>> -     ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
>>> +     acpi_use_parent_companion(&priv->adapter.dev);
>>
>> I think this case is a bit too trivial for a helper, it's one line before, and
>> one line after, so it doesn't really save much.
> 
> If this pattern is repeated in multiple places, the helper makes sense IMO.
> 

I didn't check each usage in detail, but this should be the places where the new
helper can be used.
Another advantage IMO is that the helper, being a function instead of a macro,
is type-safe.

drivers/usb/common/ulpi.c:      ACPI_COMPANION_SET(&ulpi->dev, ACPI_COMPANION(dev));
drivers/usb/dwc3/dwc3-pci.c:    ACPI_COMPANION_SET(&dwc->dwc3->dev, ACPI_COMPANION(dev));
drivers/usb/core/message.c:             ACPI_COMPANION_SET(&intf->dev, ACPI_COMPANION(&dev->dev));
drivers/tty/serial/8250/8250_exar.c:    ACPI_COMPANION_SET(&pdev->dev, ACPI_COMPANION(&pcidev->dev));
drivers/i2c/busses/i2c-imx.c:   ACPI_COMPANION_SET(&i2c_imx->adapter.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-kempld.c:        ACPI_COMPANION_SET(&i2c->adap.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-virtio.c:        ACPI_COMPANION_SET(&vi->adap.dev, ACPI_COMPANION(vdev->dev.parent));
drivers/i2c/busses/i2c-dln2.c:  ACPI_COMPANION_SET(&dln2->adapter.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-i801.c:     ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
drivers/i2c/busses/i2c-ismt.c:  ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-cros-ec-tunnel.c:        ACPI_COMPANION_SET(&bus->adap.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-synquacer.c:     ACPI_COMPANION_SET(&i2c->adapter.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-designware-pcidrv.c:     ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-qup.c:           ACPI_COMPANION_SET(&qup->adap.dev, ACPI_COMPANION(qup->dev));
drivers/i2c/busses/i2c-designware-platdrv.c:    ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-qcom-geni.c:             ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(dev));
drivers/i2c/busses/i2c-amd-mp2-plat.c:  ACPI_COMPANION_SET(&i2c_dev->adap.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-xgene-slimpro.c: ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-tegra.c: ACPI_COMPANION_SET(&i2c_dev->adapter.dev, ACPI_COMPANION(&pdev->dev));
drivers/i2c/busses/i2c-xlp9xx.c:        ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev));


>>
>>>       priv->adapter.retries = 3;
>>>
>>>       priv->pci_dev = dev;
>>





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