Commit ae278a93 authored by Stephen Warren's avatar Stephen Warren
Browse files

clocksource: add common of_clksrc_init() function 



It is desirable to move all clocksource drivers to drivers/clocksource,
yet each requires its own initialization function. We'd rather not
pollute <linux/> with a header for each function. Instead, create a
single of_clksrc_init() function which will determine which clocksource
driver to initialize based on device tree.

Based on a similar patch for drivers/irqchip by Thomas Petazzoni.

Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
parent 6bb27d73

drivers/clocksource/Kconfig

+3 −0
Original line number Diff line number Diff line 
config CLKSRC_OF

	bool



config CLKSRC_I8253

	bool

drivers/clocksource/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_CLKSRC_OF)	+= clksrc-of.o

obj-$(CONFIG_ATMEL_TCB_CLKSRC)	+= tcb_clksrc.o

obj-$(CONFIG_X86_CYCLONE_TIMER)	+= cyclone.o

obj-$(CONFIG_X86_PM_TIMER)	+= acpi_pm.o

drivers/clocksource/clksrc-of.c

0 → 100644
+35 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/init.h>

#include <linux/of.h>



extern struct of_device_id __clksrc_of_table[];



static const struct of_device_id __clksrc_of_table_sentinel

	__used __section(__clksrc_of_table_end);



void __init clocksource_of_init(void)

{

	struct device_node *np;

	const struct of_device_id *match;

	void (*init_func)(void);



	for_each_matching_node_and_match(np, __clksrc_of_table, &match) {

		init_func = match->data;

		init_func();

	}

}

include/asm-generic/vmlinux.lds.h

+9 −0
Original line number Diff line number Diff line
@@ -149,6 +149,14 @@ 
#define TRACE_SYSCALLS()

#endif



#ifdef CONFIG_CLKSRC_OF

#define CLKSRC_OF_TABLES() . = ALIGN(8);				\

			   VMLINUX_SYMBOL(__clksrc_of_table) = .;	\

			   *(__clksrc_of_table)				\

			   *(__clksrc_of_table_end)

#else

#define CLKSRC_OF_TABLES()

#endif



#define KERNEL_DTB()							\

	STRUCT_ALIGN();							\
@@ -493,6 +501,7 @@ 
	DEV_DISCARD(init.rodata)					\

	CPU_DISCARD(init.rodata)					\

	MEM_DISCARD(init.rodata)					\

	CLKSRC_OF_TABLES()						\

	KERNEL_DTB()



#define INIT_TEXT							\

include/linux/clocksource.h

+9 −0
Original line number Diff line number Diff line
@@ -332,4 +332,13 @@ extern int clocksource_mmio_init(void __iomem *, const char *, 


extern int clocksource_i8253_init(void);



#ifdef CONFIG_CLKSRC_OF

extern void clocksource_of_init(void);



#define CLOCKSOURCE_OF_DECLARE(name, compat, fn)			\

	static const struct of_device_id __clksrc_of_table_##name	\

		__used __section(__clksrc_of_table)			\

		 = { .compatible = compat, .data = fn };

#endif



#endif /* _LINUX_CLOCKSOURCE_H */

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