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timer: Support clocks via phandle

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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 <vzakhar@synopsys.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Zakharov Vlad 2016-12-09 17:18:32 +03:00 • committed by Tom Rini
parent bd2e9714c8
commit a5acafb255
1 changed files with 13 additions and 2 deletions
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15
drivers/timer/timer-uclass.c
View file

@ -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 +43,19 @@ 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);
struct clk timer_clk;
int err;
ulong ret;
uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"clock-frequency", 0);
err = clk_get_by_index(dev, 0, &timer_clk);
if (!err) {
ret = clk_get_rate(&timer_clk);
if (IS_ERR_VALUE(ret))
return ret;
uc_priv->clock_rate = ret;
} else
uc_priv->clock_rate = fdtdec_get_int(gd->fdt_blob,
dev->of_offset, "clock-frequency", 0);
return 0;
}