Every timer device needs to have a valid clock frequency and it can be specified in the device tree. Use pre_probe() to get this in the timer uclass driver.
Signed-off-by: Bin Meng bmeng.cn@gmail.com ---
drivers/timer/timer-uclass.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c index 82c6897..0218591 100644 --- a/drivers/timer/timer-uclass.c +++ b/drivers/timer/timer-uclass.c @@ -9,6 +9,8 @@ #include <errno.h> #include <timer.h>
+DECLARE_GLOBAL_DATA_PTR; + /* * Implement a timer uclass to work with lib/time.c. The timer is usually * a 32 bits free-running up counter. The get_rate() method is used to get @@ -35,8 +37,19 @@ unsigned long timer_get_rate(struct udevice *dev) return uc_priv->clock_rate; }
+static int timer_pre_probe(struct udevice *dev) +{ + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); + + uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "clock-frequency", 0); + + return 0; +} + UCLASS_DRIVER(timer) = { .id = UCLASS_TIMER, .name = "timer", + .pre_probe = timer_pre_probe, .per_device_auto_alloc_size = sizeof(struct timer_dev_priv), };