Hi Andy
Thanks for the review!
On 29/01/18 23:30, Andy Shevchenko wrote:
> On Mon, Jan 29, 2018 at 5:54 AM, Andrew Cooks <andrew.cooks@xxxxxxxxxxxx> wrote:
>> 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")
>>
>> In the i2c-piix4 driver the adapters are enumerated as:
>> Main SMBus adapter Port 0, Port 2, ..., aux port (i.e., ASF adapter)
>>
>> However, in the AMD BKDG documentation[1], the implied order of ports is:
>> Main SMBus adapter Port 0, ASF adapter, Port 2, Port 3, ...
>>
>> This ordering difference is unfortunate, and we assume that ACPI
>> developers will use the Linux ordering.
>>
>> [1] 52740 BIOS and Kernel Developer's Guide (BKDG) for AMD Family 16h
>> Models 30h-3Fh Processors
>
>> + if (has_acpi_companion(&dev->dev)) {
>> + acpi_preset_companion(&adap->dev,
>> + ACPI_COMPANION(&dev->dev),
>> + piix4_adapter_count++);
>> + }
>
> Wouldn't be enough just following:
>
> ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&dev->dev));
That seems much cleaner, but it doesn't seem to do what I need (my devices don't show up). I'm still investigating.
>
> ?
>
> Or if this increment is needed:
>
> struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
>
> if (adev) {
> ACPI_COMPANION_SET(&adap->dev, adev);
> piix4_adapter_count++);
> }
>
