6.6-stable review patch. If anyone has any objections, please let me know.
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From: Bruno Thomsen bruno.thomsen@gmail.com
[ Upstream commit 87064da2db7be537a7da20a25c18ba912c4db9e1 ]
When using interrupt pin (INT A) as watchdog output all other interrupt sources need to be disabled to avoid additional resets. Resulting INT_A_MASK1 value is 55 (0x37).
Signed-off-by: Bruno Thomsen bruno.thomsen@gmail.com Link: https://lore.kernel.org/r/20250902182235.6825-1-bruno.thomsen@gmail.com Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/rtc/rtc-pcf2127.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c index e793c019fb9d7..05a54f4d4d9a6 100644 --- a/drivers/rtc/rtc-pcf2127.c +++ b/drivers/rtc/rtc-pcf2127.c @@ -528,6 +528,21 @@ static int pcf2127_watchdog_init(struct device *dev, struct pcf2127 *pcf2127) set_bit(WDOG_HW_RUNNING, &pcf2127->wdd.status); }
+ /* + * When using interrupt pin (INT A) as watchdog output, only allow + * watchdog interrupt (PCF2131_BIT_INT_WD_CD) and disable (mask) all + * other interrupts. + */ + if (pcf2127->cfg->type == PCF2131) { + ret = regmap_write(pcf2127->regmap, + PCF2131_REG_INT_A_MASK1, + PCF2131_BIT_INT_BLIE | + PCF2131_BIT_INT_BIE | + PCF2131_BIT_INT_AIE | + PCF2131_BIT_INT_SI | + PCF2131_BIT_INT_MI); + } + return devm_watchdog_register_device(dev, &pcf2127->wdd); }