On Wed, Feb 24, 2021 at 04:00:14PM +0100, Alexandre Belloni wrote: > 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. > Correct, those would have to be mutexes. Thanks, Guenter
