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dm: timer: Implement pre_probe()

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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>
This commit is contained in:
Bin Meng 2015-11-13 00:11:15 -08:00 committed by Simon Glass
parent 435ae76edd
commit 579eb5a0cc
1 changed files with 13 additions and 0 deletions
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13
drivers/timer/timer-uclass.c
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@ -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),
};