Re: [PATCH v9 5/7] ACPI: Translate the I/O range of non-MMIO devices before scanning

John Garry
2017-06-29T16:17:19Z

On 16/06/2017 12:24, Rafael J. Wysocki wrote:
>>>> >> >
>>>> >> > It causes acpi_default_enumeration() to be called but it should be fine
>>>> >> > as we are dealing with platform device anyway.
>>> >>
>>> >> I do not quite understand how declaring such MFD cell above would make sure
>>> >> that the LPC probe is called before the IPMI device is enumerated...
>> >
>> > In fact it may be that it is not sufficient in this case because the
>> > ACPI core might enumerate child devices before the LPC driver even gets
>> > a chance to probe so you would need to add also scan handler to the
>> > child devices and mark them already enumerated or something like that.
> Or extend the special I2C/SPI handling to them.
>

For this, is it possible to just configure the ACPI table so we spoof
that the LPC slave (IPI0001), is an i2c/spi slave? Could we just add a
resource of type ACPI_RESOURCE_TYPE_SERIAL_BUS, and common serial bus
type i2c/spi to solve this?

This resource would/should need to be ignored for other purposes.

John

> Thanks,
> Rafael