From: Hugo Villeneuve hvilleneuve@dimonoff.com

Bit SRESET (3) is cleared when a reset operation is completed. Having the IOCONTROL register as non-volatile will always read SRESET as 1, which is incorrect.

Also, if IOCONTROL register is not a volatile register, the upcoming patch "serial: sc16is7xx: fix regression with GPIO configuration" doesn't work when setting some shared GPIO lines as modem control lines.

Therefore mark IOCONTROL register as a volatile register.

Cc: stable@vger.kernel.org # 6.1.x Signed-off-by: Hugo Villeneuve hvilleneuve@dimonoff.com Reviewed-by: Lech Perczak lech.perczak@camlingroup.com Tested-by: Lech Perczak lech.perczak@camlingroup.com --- drivers/tty/serial/sc16is7xx.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 8ae2afc76a9b..306ae512b38a 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;