Re: [PATCH v3 1/7] acpi: Add early device probing infrastructure

From: Lorenzo Pieralisi
Date: Tue Sep 29 2015 - 07:05:15 EST

On Mon, Sep 28, 2015 at 03:49:12PM +0100, 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
> table.
> A acpi_probe_device_table() is provided, taking an identifier for
> a set of acpi_prove_entries, and iterating over the registered
> entries.
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> drivers/acpi/scan.c | 39 +++++++++++++++++++++++
> include/asm-generic/ | 10 ++++++
> include/linux/acpi.h | 66 +++++++++++++++++++++++++++++++++++++++

Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
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