* qianfan <qianfanguijin@xxxxxxx> [220212 02:18]: > > 在 2022/2/3 17:07, Tony Lindgren 写道: > > Hi, > > > > * qianfan <qianfanguijin@xxxxxxx> [220119 08:36]: > > > Hi everyone: > > > > > > On my board there has a gpio watchdong connected on am3358. And I found that > > > the omap gpio device ready too later so it takes about 5 seconds when the > > > gpio-wdt is ready. > > > > > > I had tested on some version of linux, check when the OMAP GPIO is ready. > > > Next is the log: > > > > > > v4.19 [ 0.195191] OMAP GPIO hardware version 0.1 > > > > > > v5.4 [ 1.168868] OMAP GPIO hardware version 0.1 > > > > > > v5.9 [ 4.598052] OMAP GPIO hardware version 0.1 > > > > > > v5.15 [ 1.253851] OMAP GPIO hardware version 0.1 > > > > > > I can't find which commit slowdown omap gpio driver. could you please give > > > me some advice? > > We've moved to probe pretty much everything at normal module_init time > > instead of trying to probe everything early. Only clocks and system timers > > need to be probed early for the omap variants. > > > > One of the reasons for the device drivers probing later on during the boot > > is caused by drivers/bus/ti-sysc.c. As ti-sysc is the parent device on the > > interconnect, none of it's child devices probe before it. And there should > > not be any need to probe ti-sysc early. The total boot-up time should be > > about the same, just the probe order has changed. If there are issues with > > the boot-up time in general, then that's a bug. > > > > Maybe you want to configure the watchdog in the bootloader initially until > > the Linux device drivers get probed? > > Yes, the gpio watchdog is alived on bootloader, I want find a good way to > feed it until linux driver ready. gpio-wdt.c has an option > CONFIG_GPIO_WATCHDOG_ARCH_INITCALL which will register gpio-wdt driver on > arch_innitcall, but this feature doesn't work on am335x platform due to the > gpio driver ready too later. Well seems like the boottime of 1.25 seconds to having the gpio probed should be way longer than your bootloader configured watchdog timeout :) What do you have the bootloader set the watchdog timeout? Regards, Tony
