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rtc: add dm_rtc_read helper and ->read method

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Some users may want to read multiple consecutive 8-bit
registers. Instead of each caller having to implement the loop,
provide a dm_rtc_read() helper. Also, allow a driver to provide a
->read method, which can be more efficient than reading one register
at a time.

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
This commit is contained in:
Rasmus Villemoes
2020-07-06 22:01:10 +02:00
committed by Heiko Schocher
parent 35d3982e23
commit d8be08805b
2 changed files with 42 additions and 0 deletions
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19
drivers/rtc/rtc-uclass.c
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@@ -40,6 +40,25 @@ int dm_rtc_reset(struct udevice *dev)
return ops->reset(dev);
}
int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len)
{
struct rtc_ops *ops = rtc_get_ops(dev);
assert(ops);
if (ops->read)
return ops->read(dev, reg, buf, len);
if (!ops->read8)
return -ENOSYS;
while (len--) {
int ret = ops->read8(dev, reg++);
if (ret < 0)
return ret;
*buf++ = ret;
}
return 0;
}
int rtc_read8(struct udevice *dev, unsigned int reg)
{
struct rtc_ops *ops = rtc_get_ops(dev);