| Message ID | 20220401124325.1810108-7-pan@semihalf.com |
|---|---|
| State | Superseded |
| Delegated to: | Simon Goldschmidt |
| Headers | show |
| Series | Add Chameleon V3 support | expand |
On Fri, 1 Apr 2022 at 06:44, Paweł Anikiel <pan@semihalf.com> wrote: > > From the ATSHA204A datasheet (document DS40002025A): > > Wake: If SDA is held low for a period greater than tWLO, the device > exits low-power mode and, after a delay of tWHI, is ready to receive > I2C commands. > > tWHI value can be found in table 7-2. > > Signed-off-by: Paweł Anikiel <pan@semihalf.com> > --- > drivers/misc/atsha204a-i2c.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/atsha204a-i2c.c b/drivers/misc/atsha204a-i2c.c index b89463babb..ba2ae3d85a 100644 --- a/drivers/misc/atsha204a-i2c.c +++ b/drivers/misc/atsha204a-i2c.c @@ -20,7 +20,8 @@ #include <linux/delay.h> #include <u-boot/crc.h> -#define ATSHA204A_TWLO 60 +#define ATSHA204A_TWLO_US 60 +#define ATSHA204A_TWHI_US 2500 #define ATSHA204A_TRANSACTION_TIMEOUT 100000 #define ATSHA204A_TRANSACTION_RETRY 5 #define ATSHA204A_EXECTIME 5000 @@ -225,7 +226,7 @@ int atsha204a_wakeup(struct udevice *dev) continue; } - udelay(ATSHA204A_TWLO); + udelay(ATSHA204A_TWLO_US + ATSHA204A_TWHI_US); res = atsha204a_recv_resp(dev, &resp); if (res) {
From the ATSHA204A datasheet (document DS40002025A): Wake: If SDA is held low for a period greater than tWLO, the device exits low-power mode and, after a delay of tWHI, is ready to receive I2C commands. tWHI value can be found in table 7-2. Signed-off-by: Paweł Anikiel <pan@semihalf.com> --- drivers/misc/atsha204a-i2c.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)