diff options
Diffstat (limited to 'drivers/net/dsa/ks8995.c')
| -rw-r--r-- | drivers/net/dsa/ks8995.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/net/dsa/ks8995.c b/drivers/net/dsa/ks8995.c index d135b061d810..bdee8c62315f 100644 --- a/drivers/net/dsa/ks8995.c +++ b/drivers/net/dsa/ks8995.c @@ -438,9 +438,15 @@ static int ks8995_probe(struct spi_device *spi) if (err) return err; - /* de-assert switch reset */ - /* FIXME: this likely requires a delay */ - gpiod_set_value_cansleep(ks->reset_gpio, 0); + if (ks->reset_gpio) { + /* + * If a reset line was obtained, wait for 100us after + * de-asserting RESET before accessing any registers, see + * the KS8995MA datasheet, page 44. + */ + gpiod_set_value_cansleep(ks->reset_gpio, 0); + udelay(100); + } spi_set_drvdata(spi, ks); |