Earlier timer driver needed a clock-frequency property in compatible
device-tree nodes. Another way is to reference a clock via a phandle.
So now timer_pre_probe tries to get clock by reference through device
tree. In case it is impossible to get clock device through the
reference, clock-frequency property of the timer node is read to provide
backward compatibility.
Signed-off-by: Vlad Zakharov <vzak...@synopsys.com>
---
drivers/timer/timer-uclass.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
index f8ddf93..cca41f1 100644
--- a/drivers/timer/timer-uclass.c
+++ b/drivers/timer/timer-uclass.c
@@ -8,6 +8,7 @@
#include <dm.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
+#include <clk.h>
#include <errno.h>
#include <timer.h>
@@ -42,9 +43,17 @@ unsigned long notrace timer_get_rate(struct udevice *dev)
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);
+ struct clk *timer_clk;
+ int err;
+
+ err = clk_get_by_index(dev, 0, timer_clk);
+ if (!err) {
+ uc_priv->clock_rate = clk_get_rate(timer_clk);
+ if (uc_priv->clock_rate < 0)
+ return uc_priv->clock_rate;
+ } else
+ uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob,
+ dev->of_offset, "clock-frequency", 0);
return 0;
}
--
2.7.4
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