diff options
Diffstat (limited to 'drivers/clocksource/armv7m_systick.c')
| -rw-r--r-- | drivers/clocksource/armv7m_systick.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/clocksource/armv7m_systick.c b/drivers/clocksource/armv7m_systick.c index addfd2c64f54..a315491b7047 100644 --- a/drivers/clocksource/armv7m_systick.c +++ b/drivers/clocksource/armv7m_systick.c @@ -7,6 +7,7 @@ #include <linux/kernel.h> #include <linux/clocksource.h> #include <linux/clockchips.h> +#include <linux/io.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/clk.h> @@ -21,7 +22,7 @@ #define SYSTICK_LOAD_RELOAD_MASK 0x00FFFFFF -static void __init system_timer_of_register(struct device_node *np) +static int __init system_timer_of_register(struct device_node *np) { struct clk *clk = NULL; void __iomem *base; @@ -31,22 +32,26 @@ static void __init system_timer_of_register(struct device_node *np) base = of_iomap(np, 0); if (!base) { pr_warn("system-timer: invalid base address\n"); - return; + return -ENXIO; } ret = of_property_read_u32(np, "clock-frequency", &rate); if (ret) { clk = of_clk_get(np, 0); - if (IS_ERR(clk)) + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); goto out_unmap; + } ret = clk_prepare_enable(clk); if (ret) goto out_clk_put; rate = clk_get_rate(clk); - if (!rate) + if (!rate) { + ret = -EINVAL; goto out_clk_disable; + } } writel_relaxed(SYSTICK_LOAD_RELOAD_MASK, base + SYST_RVR); @@ -64,7 +69,7 @@ static void __init system_timer_of_register(struct device_node *np) pr_info("ARM System timer initialized as clocksource\n"); - return; + return 0; out_clk_disable: clk_disable_unprepare(clk); @@ -73,6 +78,8 @@ out_clk_put: out_unmap: iounmap(base); pr_warn("ARM System timer register failed (%d)\n", ret); + + return ret; } CLOCKSOURCE_OF_DECLARE(arm_systick, "arm,armv7m-systick", |