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| author | Hui Wang <hui.wang@canonical.com> | 2023-07-24 06:47:27 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-30 14:53:35 +0300 |
| commit | 77a82cebf0eb023203b4cb2235cab75afc77cccf (patch) | |
| tree | 4dc2124d93a07cd0ae4f364a67cf24914123deff /drivers/tty/serial/sc16is7xx.c | |
| parent | 130a9571aee966ad8ba65719fe6c32db7b26db6a (diff) | |
| download | linux-77a82cebf0eb023203b4cb2235cab75afc77cccf.tar.xz | |
serial: sc16is7xx: Put IOControl register into regmap_volatile
According to the IOControl register bits description in the page 31 of
the product datasheet, we know the bit 3 of IOControl register is
softreset, this bit will self-clearing once the reset finish.
In the probe, the softreset bit is set, and when we read this register
from debugfs/regmap interface, we found the softreset bit is still
setting, this confused us for a while. Finally we found this register
is cached, to read the real value from register, we could put it
into the regmap_volatile().
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Link: https://lore.kernel.org/r/20230724034727.17335-1-hui.wang@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/sc16is7xx.c')
| -rw-r--r-- | drivers/tty/serial/sc16is7xx.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index cfffc730ba34..18a48ce052c2 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -488,6 +488,7 @@ static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg) case SC16IS7XX_TXLVL_REG: case SC16IS7XX_RXLVL_REG: case SC16IS7XX_IOSTATE_REG: + case SC16IS7XX_IOCONTROL_REG: return true; default: break; |