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Groups > linux.kernel > #1220666
| From | Marc Zyngier <marc.zyngier@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 1/5] acpi: Add basic device probing infrastructure |
| Date | 2015-09-08 12:00 +0200 |
| Message-ID | <q6nR0-Fh-23@gated-at.bofh.it> (permalink) |
| References | <q52EW-8lv-13@gated-at.bofh.it> <q52EX-8lv-33@gated-at.bofh.it> <q6bPQ-gZ-27@gated-at.bofh.it> |
| Organization | ARM Ltd |
On 07/09/15 22:29, Rafael J. Wysocki wrote: > 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 >> table. >> >> 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? By the time we get to process non-static tables, the whole probing infrastructure (including the ACPI interpreter) should be up and running. I'm not seeing this stuff as a replacement for more dynamic things - quite the opposite. It is only to be used for early bring-up. Thanks, M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCH 1/5] acpi: Add basic device probing infrastructure "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-09-07 23:10 +0200
Re: [PATCH 1/5] acpi: Add basic device probing infrastructure Marc Zyngier <marc.zyngier@arm.com> - 2015-09-08 12:00 +0200
Re: [PATCH 1/5] acpi: Add basic device probing infrastructure Hanjun Guo <hanjun.guo@linaro.org> - 2015-09-08 15:10 +0200
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