[U-Boot] [PATCH v3 02/11] dm: timer: Implement pre_probe()

[Bin Meng]

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

Changes in v3: None
Changes in v2: None

 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),
 };
-- 
1.8.2.1