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rtc: rx8025: revise single register write to use offset

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Writing of individual registers was not functioning
correctly as a 0 'offset' byte under DM-managed
I2C was being appended in front of register we
wanted to access.

Signed-off-by: Mathew McBride <matt@traverse.com.au>
This commit is contained in:
Mathew McBride 2021-09-17 06:46:04 +00:00 committed by Tom Rini
parent 771fc0c079
commit 701c04f331
1 changed files with 7 additions and 4 deletions
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11
drivers/rtc/rx8025.c
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@ -214,11 +214,14 @@ static int rx8025_rtc_reset(struct udevice *dev)
*/
static int rtc_write(struct udevice *dev, uchar reg, uchar val)
{
uchar buf[2];
buf[0] = reg << 4;
buf[1] = val;
/* The RX8025/RX8035 uses the top 4 bits of the
* 'offset' byte as the start register address,
* and the bottom 4 bits as a 'transfer' mode setting
* (only applicable for reads)
*/
u8 offset = (reg << 4);
if (dm_i2c_write(dev, 0, buf, 2)) {
if (dm_i2c_reg_write(dev, offset, val)) {
printf("Error writing to RTC\n");
return -EIO;
}