Hi, On 24/02/2021 15:55:00+0100, Bruno Thomsen wrote: > You could be right about that, I don't think the watchdog feature should > be available for use if the alarm feature is enabled due to how CTRL2 > register behaves. > > The hardware I am testing on is a custom board, but it's actually > possible to get a Raspberry Pi module called RasClock that has > the chip. > I have an eval board for the PCF2127 (and PCF2129), the OM13513. > I will test some locking around WD_VAL register access as that is used > in pcf2127_wdt_ping function. > > My initial test shows that spin_lock_irqsave around regmap calls are not > a good idea as it result in: > BUG: scheduling while atomic: watchdog/70/0x00000002 > BUG: scheduling while atomic: systemd/1/0x00000002 > The issue is not only regmap but the fact that i2C and spi accesses are allowed to sleep. -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
