Re: [PATCH 1/5] acpi: Add basic device probing infrastructure
From: Rafael J. Wysocki
Date: Mon Sep 07 2015 - 17:01:52 EST
On Friday, September 04, 2015 06:06:48 PM Marc Zyngier wrote:
> IRQ controllers and timers are the two types of device the kernel
> requires before being able to use the device driver model.
> ACPI so far lacks a proper probing infrastructure similar to the one
> we have with DT, where we're able to declare IRQ chips and
> clocksources inside the driver code, and let the core code pick it up
> and call us back on a match. This leads to all kind of really ugly
> hacks all over the arm64 code and even in the ACPI layer.
> In order to allow some basic probing based on the ACPI tables,
> introduce "struct acpi_probe_entry" which contains just enough
> data and callbacks to match a table, an optional subtable, and
> call a probe function. A driver can, at build time, register itself
> and expect being called if the right entry exists in the ACPI
> A acpi_probe_device_init() is provided, taking an ACPI table
> identifier, and iterating over the registered entries.
What about things that are provided by the ACPI namespace (eg. via _MAT) rather
than in static tables?
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