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ARM/clocksource: use automatic DT probing for ux500 PRCMU 

The ARM core kernel already calls clocksource_of_init() so why
go to all the trouble of locating and probing this node in the
machine. CLOCKSOURCE_OF_DECLARE() will take care of it in the
clocksource driver, and thus we can also get rid of the
dangling header file <linux/clksrc-dbx500-prcmu.h>

Suggested-by: Arnd Bergmann <arndb@linaro.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Linus Walleij 2015-12-01 15:00:24 +01:00 committed by Arnd Bergmann
parent 75305275a7
commit 9d2aa8c796
7 changed files with 7 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/mach-ux500/Makefile
View File

@ -2,7 +2,7 @@
# Makefile for the linux kernel, U8500 machine.
#
obj-y := cpu.o id.o timer.o pm.o
obj-y := cpu.o id.o pm.o
obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o
obj-$(CONFIG_UX500_SOC_DB8500) += cpu-db8500.o
obj-$(CONFIG_MACH_MOP500) += board-mop500-regulators.o \

2
arch/arm/mach-ux500/cpu-db8500.c
View File

@ -156,8 +156,6 @@ static const char * stericsson_dt_platform_compat[] = {
DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
.map_io = u8500_map_io,
.init_irq = ux500_init_irq,
/* we re-use nomadik timer here */
.init_time = ux500_timer_init,
.init_machine = u8500_init_machine,
.init_late = NULL,
.dt_compat = stericsson_dt_platform_compat,

1
arch/arm/mach-ux500/cpu.c
View File

@ -9,7 +9,6 @@
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/mfd/dbx500-prcmu.h>
#include <linux/clksrc-dbx500-prcmu.h>
#include <linux/sys_soc.h>
#include <linux/err.h>
#include <linux/slab.h>

3
arch/arm/mach-ux500/setup.h
View File

@ -12,7 +12,6 @@
#define __ASM_ARCH_SETUP_H
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <linux/init.h>
#include <linux/mfd/abx500/ab8500.h>
@ -24,8 +23,6 @@ extern void __init ux500_init_irq(void);
extern struct device *ux500_soc_device_init(const char *soc_id);
extern void ux500_timer_init(void);
extern void ux500_cpu_die(unsigned int cpu);
#endif /* __ASM_ARCH_SETUP_H */

48
arch/arm/mach-ux500/timer.c
View File

@ -1,48 +0,0 @@
/*
* Copyright (C) ST-Ericsson SA 2011
*
* License Terms: GNU General Public License v2
* Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson
*/
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/clksrc-dbx500-prcmu.h>
#include <linux/clocksource.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "setup.h"
#include "db8500-regs.h"
#include "id.h"
static const struct of_device_id prcmu_timer_of_match[] __initconst = {
{ .compatible = "stericsson,db8500-prcmu-timer-4", },
{ },
};
void __init ux500_timer_init(void)
{
void __iomem *prcmu_timer_base;
void __iomem *tmp_base;
struct device_node *np;
if (cpu_is_u8500_family() || cpu_is_ux540_family())
prcmu_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE);
else
ux500_unknown_soc();
np = of_find_matching_node(NULL, prcmu_timer_of_match);
if (!np)
goto dt_fail;
tmp_base = of_iomap(np, 0);
if (!tmp_base)
goto dt_fail;
prcmu_timer_base = tmp_base;
dt_fail:
clksrc_dbx500_prcmu_init(prcmu_timer_base);
clocksource_probe();
}

9
drivers/clocksource/clksrc-dbx500-prcmu.c
View File

@ -12,8 +12,9 @@
* power domain. We use the Timer 4 for our always-on clock
* source on DB8500.
*/
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clockchips.h>
#include <linux/clksrc-dbx500-prcmu.h>
#include <linux/sched_clock.h>
#define RATE_32K 32768
@ -63,9 +64,9 @@ static u64 notrace dbx500_prcmu_sched_clock_read(void)
#endif
void __init clksrc_dbx500_prcmu_init(void __iomem *base)
static void __init clksrc_dbx500_prcmu_init(struct device_node *node)
{
clksrc_dbx500_timer_base = base;
clksrc_dbx500_timer_base = of_iomap(node, 0);
/*
* The A9 sub system expects the timer to be configured as
@ -85,3 +86,5 @@ void __init clksrc_dbx500_prcmu_init(void __iomem *base)
#endif
clocksource_register_hz(&clocksource_dbx500_prcmu, RATE_32K);
}
CLOCKSOURCE_OF_DECLARE(dbx500_prcmu, "stericsson,db8500-prcmu-timer-4",
clksrc_dbx500_prcmu_init);

20
include/linux/clksrc-dbx500-prcmu.h
View File

@ -1,20 +0,0 @@
/*
* Copyright (C) ST-Ericsson SA 2011
*
* License Terms: GNU General Public License v2
* Author: Mattias Wallin <mattias.wallin@stericsson.com>
*
*/
#ifndef __CLKSRC_DBX500_PRCMU_H
#define __CLKSRC_DBX500_PRCMU_H
#include <linux/init.h>
#include <linux/io.h>
#ifdef CONFIG_CLKSRC_DBX500_PRCMU
void __init clksrc_dbx500_prcmu_init(void __iomem *base);
#else
static inline void __init clksrc_dbx500_prcmu_init(void __iomem *base) {}
#endif
#endif