dm: timer: Implement pre_probe()

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>
Acked-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
index 82c6897..0218591 100644 (file)
--- 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),
 };