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...@gmail.com>
Acked-by: Thomas Chou <tho...@wytron.com.tw>
Acked-by: Simon Glass <s...@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
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