diff options
| author | Alexander Aring <alex.aring@gmail.com> | 2014-03-15 09:29:05 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-03-17 16:10:26 -0400 |
| commit | 56f023fbe8fff04a46b5486288eaa1dc8bfdd5b9 (patch) | |
| tree | 8de20aaf7622d6019ddc63df13c44c02b6648a5f /drivers | |
| parent | 7e8146189a6c2ba9445b8d848847f2520c6cb028 (diff) | |
| download | linux-56f023fbe8fff04a46b5486288eaa1dc8bfdd5b9.tar.bz2 | |
at86rf230: change reset timings
While checkpatch another patch I got a:
"WARNING: msleep < 20ms can sleep for up to 20ms"
The datasheet of at86rf231 and at86rf212 says a minimum delay for reset
pulse width and spi access latency after reset is 625 nanoseconds.
This patch removes the 1 milliseconds sleep and replace it with a 1
microseconds udelay which should be also okay for the reset pulse width.
To change the state from RESET -> TRX_OFF the at86rf230 device needs 120
microseconds, this is a worst case of all at86rf* chips.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ieee802154/at86rf230.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c index 030bf3995e7e..37442407d948 100644 --- a/drivers/net/ieee802154/at86rf230.c +++ b/drivers/net/ieee802154/at86rf230.c @@ -1080,11 +1080,11 @@ static int at86rf230_probe(struct spi_device *spi) } /* Reset */ - msleep(1); + udelay(1); gpio_set_value(pdata->rstn, 0); - msleep(1); + udelay(1); gpio_set_value(pdata->rstn, 1); - msleep(1); + usleep_range(120, 240); rc = __at86rf230_detect_device(spi, &man_id, &part, &version); if (rc < 0) |