DT enjoys a rather nice probing infrastructure for clocksources, while ACPI is so far stuck into a very distant past.
This patch introduces a declarative API, allowing clocksources to be self-contained and be called when parsing the GTDT table.
Signed-off-by: Marc Zyngier marc.zyngier@arm.com --- drivers/clocksource/clksrc-of.c | 4 ++++ include/asm-generic/vmlinux.lds.h | 1 + include/linux/clocksource.h | 3 +++ 3 files changed, 8 insertions(+)
diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c index 0093a8e..a2105bd 100644 --- a/drivers/clocksource/clksrc-of.c +++ b/drivers/clocksource/clksrc-of.c @@ -14,6 +14,7 @@ * along with this program. If not, see http://www.gnu.org/licenses/. */
+#include <linux/acpi.h> #include <linux/init.h> #include <linux/of.h> #include <linux/clocksource.h> @@ -38,6 +39,9 @@ void __init clocksource_of_init(void) init_func(np); clocksources++; } + + clocksources += acpi_probe_device_table(clksrc); + if (!clocksources) pr_crit("%s: no matching clocksources found\n", __func__); } diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index cd836cd..c4bd0e2 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -525,6 +525,7 @@ KERNEL_DTB() \ IRQCHIP_OF_MATCH_TABLE() \ ACPI_PROBE_TABLE(irqchip) \ + ACPI_PROBE_TABLE(clksrc) \ EARLYCON_TABLE() \ EARLYCON_OF_TABLES()
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 278dd27..8cde048 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -258,4 +258,7 @@ void acpi_generic_timer_init(void); static inline void acpi_generic_timer_init(void) { } #endif
+#define CLOCKSOURCE_ACPI_DECLARE(name, table_id, fn) \ + ACPI_DECLARE_PROBE_ENTRY(clksrc, name, table_id, 0, NULL, 0, fn) + #endif /* _LINUX_CLOCKSOURCE_H */