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dm: rtc: Add 16-bit read/write support

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At present there are only 8-bit and 32-bit read/write routines in
the rtc uclass driver. This adds the 16-bit support.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2017-03-16 07:26:27 -07:00
parent c04cf0a571
commit d24c7fbcc5
2 changed files with 50 additions and 0 deletions
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30
drivers/rtc/rtc-uclass.c
View File

@ -60,6 +60,36 @@ int rtc_write8(struct udevice *dev, unsigned int reg, int val)
return ops->write8(dev, reg, val);
}
int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep)
{
u16 value = 0;
int ret;
int i;
for (i = 0; i < sizeof(value); i++) {
ret = rtc_read8(dev, reg + i);
if (ret < 0)
return ret;
value |= ret << (i << 3);
}
*valuep = value;
return 0;
}
int rtc_write16(struct udevice *dev, unsigned int reg, u16 value)
{
int i, ret;
for (i = 0; i < sizeof(value); i++) {
ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff);
if (ret)
return ret;
}
return 0;
}
int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep)
{
u32 value = 0;

20
include/rtc.h
View File

@ -127,6 +127,26 @@ int rtc_read8(struct udevice *dev, unsigned int reg);
*/
int rtc_write8(struct udevice *dev, unsigned int reg, int val);
/**
* rtc_read16() - Read a 16-bit value from the RTC
*
* @dev: Device to read from
* @reg: Offset to start reading from
* @valuep: Place to put the value that is read
* @return 0 if OK, -ve on error
*/
int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep);
/**
* rtc_write16() - Write a 16-bit value to the RTC
*
* @dev: Device to write to
* @reg: Register to start writing to
* @value: Value to write
* @return 0 if OK, -ve on error
*/
int rtc_write16(struct udevice *dev, unsigned int reg, u16 value);
/**
* rtc_read32() - Read a 32-bit value from the RTC
*