From: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
This macro does the same job as CLOCKSOURCE_OF_DECLARE. The device
name from the ACPI timer table is matched with all the registered
timer controllers and matching initialisation routine is invoked.
Signed-off-by: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
include/asm-generic/vmlinux.lds.h | 10 ++++++++++
include/linux/clocksource.h | 12 ++++++++++++
2 files changed, 22 insertions(+)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index bc2121f..3216bee 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -148,6 +148,15 @@
#define CLKSRC_OF_TABLES()
#endif
+#ifdef CONFIG_ACPI
+#define CLKSRC_ACPI_TABLES() . = ALIGN(8); \
+ VMLINUX_SYMBOL(__clksrc_acpi_table) = .; \
+ *(__clksrc_acpi_table) \
+ *(__clksrc_acpi_table_end)
+#else
+#define CLKSRC_ACPI_TABLES()
+#endif
+
#ifdef CONFIG_IRQCHIP
#define IRQCHIP_OF_MATCH_TABLE() \
. = ALIGN(8); \
@@ -491,6 +500,7 @@
MEM_DISCARD(init.rodata) \
CLK_OF_TABLES() \
CLKSRC_OF_TABLES() \
+ CLKSRC_ACPI_TABLES() \
KERNEL_DTB() \
IRQCHIP_OF_MATCH_TABLE()
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 67301a4..1d500cf 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -341,6 +341,8 @@ extern int clocksource_i8253_init(void);
struct device_node;
typedef void(*clocksource_of_init_fn)(struct device_node *);
+typedef void(*clocksource_acpi_init_fn)(void);
+
#ifdef CONFIG_CLKSRC_OF
extern void clocksource_of_init(void);
@@ -358,4 +360,14 @@ static inline void clocksource_of_init(void) {}
.data = (fn == (clocksource_of_init_fn)NULL) ? fn : fn }
#endif
+#ifdef CONFIG_ACPI
+#define CLOCKSOURCE_ACPI_DECLARE(name, compat, fn) \
+ static const struct acpi_device_id __clksrc_acpi_table_##name \
+ __used __section(__clksrc_acpi_table) \
+ = { .id = compat, \
+ .driver_data = (kernel_ulong_t)fn }
+#else
+#define CLOCKSOURCE_ACPI_DECLARE(name, compat, fn)
+#endif
+
#endif /* _LINUX_CLOCKSOURCE_H */
--
1.7.9.5
--
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