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Subject[PATCH v2 4/5] clocksource/acpi: Add probing infrastructure for ACPI-based clocksources
Date
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..4bd7fe6 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(clksrc, name, table_id, 0, NULL, 0, fn)
+
#endif /* _LINUX_CLOCKSOURCE_H */
--
2.1.4


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