From: Rafał Miłecki <[email protected]> On some devices using arch code for reading clock rate doesn't work. So far the only option was to specify clock-frequency in a DT. This works only if a clock frequency doesn't have to be calculated on runtime.
On BCM53573 SoC (with Cortex-A7) there is ILP clock that needs its own driver. With this change we can query such clocks by using a standard: clocks = <&foo>; Signed-off-by: Rafał Miłecki <[email protected]> --- drivers/clocksource/arm_arch_timer.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 5effd30..5ed98a2 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -14,6 +14,7 @@ #include <linux/smp.h> #include <linux/cpu.h> #include <linux/cpu_pm.h> +#include <linux/clk.h> #include <linux/clockchips.h> #include <linux/clocksource.h> #include <linux/interrupt.h> @@ -405,6 +406,16 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) arch_timer_rate = arch_timer_get_cntfrq(); } + /* Get clk rate through clk driver if present */ + if (!arch_timer_rate) { + struct clk *clk = of_clk_get(np, 0); + + if (!IS_ERR(clk)) { + if (!clk_prepare_enable(clk)) + arch_timer_rate = clk_get_rate(clk); + } + } + /* Check the timer frequency. */ if (arch_timer_rate == 0) pr_warn("Architected timer frequency not available\n"); -- 1.8.4.5
