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rtc: add dm_rtc_write() helper

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Similar to dm_rtc_read(), introduce a helper that allows the caller to
write multiple consecutive 8-bit registers with one call. If the
driver provides the ->write method, use that, otherwise loop using
->write8.

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 22:01:11 +02:00 committed by Heiko Schocher
parent d8be08805b
commit 09381829a2
2 changed files with 43 additions and 0 deletions
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19
drivers/rtc/rtc-uclass.c
View file

@ -59,6 +59,25 @@ int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len
return 0;
}
int dm_rtc_write(struct udevice *dev, unsigned int reg,
const u8 *buf, unsigned int len)
{
struct rtc_ops *ops = rtc_get_ops(dev);
assert(ops);
if (ops->write)
return ops->write(dev, reg, buf, len);
if (!ops->write8)
return -ENOSYS;
while (len--) {
int ret = ops->write8(dev, reg++, *buf++);
if (ret < 0)
return ret;
}
return 0;
}
int rtc_read8(struct udevice *dev, unsigned int reg)
{
struct rtc_ops *ops = rtc_get_ops(dev);

24
include/rtc.h
View file

@ -67,6 +67,18 @@ struct rtc_ops {
int (*read)(struct udevice *dev, unsigned int reg,
u8 *buf, unsigned int len);
/**
* write() - Write multiple 8-bit registers
*
* @dev: Device to write to
* @reg: First register to write
* @buf: Input buffer
* @len: Number of registers to write
* @return 0 if OK, -ve on error
*/
int (*write)(struct udevice *dev, unsigned int reg,
const u8 *buf, unsigned int len);
/**
* read8() - Read an 8-bit register
*
@ -132,6 +144,18 @@ int dm_rtc_reset(struct udevice *dev);
*/
int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len);
/**
* dm_rtc_write() - Write multiple 8-bit registers
*
* @dev: Device to write to
* @reg: First register to write
* @buf: Input buffer
* @len: Number of registers to write
* @return 0 if OK, -ve on error
*/
int dm_rtc_write(struct udevice *dev, unsigned int reg,
const u8 *buf, unsigned int len);
/**
* rtc_read8() - Read an 8-bit register
*