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rtc: fall back to ->{read, write} if ->{read, write}8 are not provided

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Similar to how the dm_rtc_{read,write} functions fall back to using
the {read,write}8 methods, do the opposite in the rtc_{read,write}8
functions.

This way, each driver only needs to provide either ->read8 or ->read
to make both rtc_read8() and dm_rtc_read() work - without this, a
driver that provides ->read() would most likely just duplicate the
logic here for implementing a ->read8() method in term of its ->read()
method. The same remarks of course apply to the write case.

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 22:01:12 +02:00 committed by Heiko Schocher
parent 09381829a2
commit 5113f0b65a
1 changed files with 19 additions and 6 deletions
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25
drivers/rtc/rtc-uclass.c
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@ -83,9 +83,17 @@ int rtc_read8(struct udevice *dev, unsigned int reg)
struct rtc_ops *ops = rtc_get_ops(dev);
assert(ops);
if (!ops->read8)
return -ENOSYS;
return ops->read8(dev, reg);
if (ops->read8)
return ops->read8(dev, reg);
if (ops->read) {
u8 buf[1];
int ret = ops->read(dev, reg, buf, 1);
if (ret < 0)
return ret;
return buf[0];
}
return -ENOSYS;
}
int rtc_write8(struct udevice *dev, unsigned int reg, int val)
@ -93,9 +101,14 @@ int rtc_write8(struct udevice *dev, unsigned int reg, int val)
struct rtc_ops *ops = rtc_get_ops(dev);
assert(ops);
if (!ops->write8)
return -ENOSYS;
return ops->write8(dev, reg, val);
if (ops->write8)
return ops->write8(dev, reg, val);
if (ops->write) {
u8 buf[1] = { val };
return ops->write(dev, reg, buf, 1);
}
return -ENOSYS;
}
int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep)