From c51423fc067b00d8c8bd0e4e7bc861bf9050511d Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Tue, 24 Apr 2012 10:04:46 +0100 Subject: [PATCH] ARM: ux500: Enable PRCMU Timer 4 (clocksource) for Device Tree In dbx500 based devices the PRCMU Timer 4 is used as a clocksource and sched_clock. Here we fetch all necessary addressing information required for correct PRCMU initialisation from the Device Tree instead of using hard-coded values. CC: Samuel Ortiz Signed-off-by: Lee Jones Signed-off-by: Linus Walleij --- arch/arm/mach-ux500/timer.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm/mach-ux500/timer.c b/arch/arm/mach-ux500/timer.c index d37df98b5c32..885c74231b8d 100644 --- a/arch/arm/mach-ux500/timer.c +++ b/arch/arm/mach-ux500/timer.c @@ -8,6 +8,7 @@ #include #include #include +#include #include @@ -43,10 +44,17 @@ static void __init ux500_twd_init(void) #define ux500_twd_init() do { } while(0) #endif +const static struct of_device_id prcmu_timer_of_match[] __initconst = { + { .compatible = "stericsson,db8500-prcmu-timer-4", }, + { }, +}; + static void __init ux500_timer_init(void) { void __iomem *mtu_timer_base; void __iomem *prcmu_timer_base; + void __iomem *tmp_base; + struct device_node *np; if (cpu_is_u5500()) { mtu_timer_base = __io_address(U5500_MTU0_BASE); @@ -58,6 +66,22 @@ static void __init ux500_timer_init(void) ux500_unknown_soc(); } + /* TODO: Once MTU has been DT:ed place code above into else. */ + if (of_have_populated_dt()) { + 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: + /* Doing it the old fashioned way. */ + /* * Here we register the timerblocks active in the system. * Localtimers (twd) is started when both cpu is up and running. -- 2.20.1