| Message ID | 20190411135847.24884-1-sr@denx.de |
|---|---|
| State | Superseded |
| Delegated to: | Stefan Roese |
| Headers | show |
| Series | [U-Boot,1/4,v4] watchdog: Implement generic watchdog_reset() version | expand |
On 11. 04. 19 15:58, Stefan Roese wrote: > This patch tries to implement a generic watchdog_reset() function that > can be used by all boards that want to service the watchdog device in > U-Boot. This watchdog servicing is enabled via CONFIG_WATCHDOG. > > Without this approach, new boards or platforms needed to implement a > board specific version of this functionality, mostly copy'ing the same > code over and over again into their board or platforms code base. > > With this new generic function, the scattered other functions are now > removed to be replaced by the generic one. The new version also enables > the configuration of the watchdog timeout via the DT "timeout-sec" > property (if enabled via CONFIG_OF_CONTROL). > > This patch also adds a new flag to the GD flags, to flag that the > watchdog is ready to use and adds the pointer to the watchdog device > to the GD. This enables us to remove the global "watchdog_dev" > variable, which was prone to cause problems because of its potentially > very early use in watchdog_reset(), even before the BSS is cleared. > > Signed-off-by: Stefan Roese <sr@denx.de> > Cc: Heiko Schocher <hs@denx.de> > Cc: Tom Rini <trini@konsulko.com> > Cc: Michal Simek <michal.simek@xilinx.com> > Cc: "Marek Behún" <marek.behun@nic.cz> > Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> > Cc: Maxim Sloyko <maxims@google.com> > Cc: Erik van Luijk <evanluijk@interact.nl> > Cc: Ryder Lee <ryder.lee@mediatek.com> > Cc: Weijie Gao <weijie.gao@mediatek.com> > Cc: Simon Glass <sjg@chromium.org> > Cc: "Álvaro Fernández Rojas" <noltari@gmail.com> > Cc: Philippe Reynes <philippe.reynes@softathome.com> > Cc: Christophe Leroy <christophe.leroy@c-s.fr> > --- > This patch depends on the following patch: > > [1] watchdog: Handle SPL build with watchdog disabled > https://patchwork.ozlabs.org/patch/1074098/ > > We have a few boards that have CONFIG_WDT (DM watchdog driver) enabled > and CONFIG_WATCHDOG (U-Boot watchdog servicing) disabled. This might > lead to a watchdog reboot, if the board does not boot fast enough into > some OS (like Linux) which services the watchdog. With this patch > now, the watchdog is started on all those boards (if found via the DT) > and also serviced as this patch also "implies" CONFIG_WATCHDOG. If > this is not desired, then please send a patch to disable > CONFIG_WATCHDOG for this board. Here the list of those boards with > their maintainers: > > taurus: Heiko Schocher <hs@denx.de> > smartweb: Heiko Schocher <hs@denx.de> > ast2500: Maxim Sloyko <maxims@google.com> > picosam9g45: Erik van Luijk <evanluijk@interact.nl> > mt7623n_bpir2: Ryder Lee <ryder.lee@mediatek.com> Weijie Gao <weijie.gao@mediatek.com> > mt7629_rfb: Ryder Lee <ryder.lee@mediatek.com> Weijie Gao <weijie.gao@mediatek.com> > bitmain_antminer_s9: Michal Simek <monstr@monstr.eu> > sandbox64: Simon Glass <sjg@chromium.org> > sandbox: Simon Glass <sjg@chromium.org> > comtrend_ct5361_ram: "Álvaro Fernández Rojas" <noltari@gmail.com> > netgear_cg3100d_ram: "Álvaro Fernández Rojas" <noltari@gmail.com> > bcm968380gerg_ram: Philippe Reynes <philippe.reynes@softathome.com> > bcm963158_ram: Philippe Reynes <philippe.reynes@softathome.com> > bcm968580xref_ram: Philippe Reynes <philippe.reynes@softathome.com> > MCR3000: Christophe Leroy <christophe.leroy@c-s.fr> > > Thanks, > Stefan > > v4: > - No change > > v3: > - Use already available CONFIG_WATCHDOG_TIMEOUT_MSECS option vs the > newly introduced WDT_DEFAULT_TIMEOUT default timeout value (if not > provided via DT property). > - Guard initr_watchdog by CONFIG_WDT instead of CONFIG_WATCHDOG && > CONFIG_WDT as suggested by Michal. This makes it possible to enable > and start the U-Boot watchdog without enabling the U-Boot watchdog > servicing. > - Add imply CONFIG_WATCHDOG to CONFIG_WDT, as this restores the > current behaviour to use the U-Boot watchdog servicing feature, if > the DM watchdog is enabled (CONFIG_WDT). If this is not desired, > CONFIG_WATCHDOG can be disabled in the board defconfig. > - Remove CONFIG_WATCHDOG from include/configs/turris_omnia.h > > v2: > - Rename watchdog_start() to initr_watchdog() and move it to board_r.c. > This way its only called once, after the DM subsystem has bound all > watchdog drivers. This enables the use of the currently implemented > logic of using the correct watchdog in U-Boot (via alias etc). > > arch/mips/mach-mt7620/cpu.c | 36 ---------------- > board/CZ.NIC/turris_mox/turris_mox.c | 30 -------------- > board/CZ.NIC/turris_omnia/turris_omnia.c | 35 ---------------- > .../microblaze-generic/microblaze-generic.c | 40 ------------------ > board/xilinx/zynq/board.c | 39 ------------------ > board/xilinx/zynqmp/zynqmp.c | 39 ------------------ > common/board_r.c | 41 +++++++++++++++++++ > drivers/watchdog/Kconfig | 1 + > drivers/watchdog/wdt-uclass.c | 26 ++++++++++++ > include/asm-generic/global_data.h | 4 ++ > include/configs/turris_omnia.h | 5 --- > 11 files changed, 72 insertions(+), 224 deletions(-) > > diff --git a/arch/mips/mach-mt7620/cpu.c b/arch/mips/mach-mt7620/cpu.c > index fe74f26a54..fcd0484a6d 100644 > --- a/arch/mips/mach-mt7620/cpu.c > +++ b/arch/mips/mach-mt7620/cpu.c > @@ -69,28 +69,6 @@ int print_cpuinfo(void) > return 0; > } > > -#ifdef CONFIG_WATCHDOG > -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; > - > -/* Called by macro WATCHDOG_RESET */ > -void watchdog_reset(void) > -{ > - static ulong next_reset; > - ulong now; > - > - if (!watchdog_dev) > - return; > - > - now = get_timer(0); > - > - /* Do not reset the watchdog too often */ > - if (now > next_reset) { > - next_reset = now + 1000; /* reset every 1000ms */ > - wdt_reset(watchdog_dev); > - } > -} > -#endif > - > int arch_misc_init(void) > { > /* > @@ -103,19 +81,5 @@ int arch_misc_init(void) > flush_dcache_range(gd->bd->bi_memstart, > gd->bd->bi_memstart + gd->ram_size - 1); > > -#ifdef CONFIG_WATCHDOG > - /* Init watchdog */ > - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { > - debug("Watchdog: Not found by seq!\n"); > - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { > - puts("Watchdog: Not found!\n"); > - return 0; > - } > - } > - > - wdt_start(watchdog_dev, 60000, 0); /* 60 seconds */ > - printf("Watchdog: Started\n"); > -#endif > - > return 0; > } > diff --git a/board/CZ.NIC/turris_mox/turris_mox.c b/board/CZ.NIC/turris_mox/turris_mox.c > index 96cb9c7e5c..8a4872343b 100644 > --- a/board/CZ.NIC/turris_mox/turris_mox.c > +++ b/board/CZ.NIC/turris_mox/turris_mox.c > @@ -119,41 +119,11 @@ int board_fix_fdt(void *blob) > } > #endif > > -#ifdef CONFIG_WDT_ARMADA_37XX > -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; > - > -void watchdog_reset(void) > -{ > - static ulong next_reset; > - ulong now; > - > - if (!watchdog_dev) > - return; > - > - now = timer_get_us(); > - > - /* Do not reset the watchdog too often */ > - if (now > next_reset) { > - wdt_reset(watchdog_dev); > - next_reset = now + 100000; > - } > -} > -#endif > - > int board_init(void) > { > /* address of boot parameters */ > gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100; > > -#ifdef CONFIG_WDT_ARMADA_37XX > - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { > - printf("Cannot find Armada 3720 watchdog!\n"); > - } else { > - printf("Enabling Armada 3720 watchdog (3 minutes timeout).\n"); > - wdt_start(watchdog_dev, 180000, 0); > - } > -#endif > - > return 0; > } > > diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c > index c7f6479a0c..8101cfd88a 100644 > --- a/board/CZ.NIC/turris_omnia/turris_omnia.c > +++ b/board/CZ.NIC/turris_omnia/turris_omnia.c > @@ -364,25 +364,12 @@ static bool disable_mcu_watchdog(void) > } > #endif > > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION) > -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; > -#endif > - > int board_init(void) > { > /* adress of boot parameters */ > gd->bd->bi_boot_params = mvebu_sdram_bar(0) + 0x100; > > #ifndef CONFIG_SPL_BUILD > -# ifdef CONFIG_WDT_ORION > - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { > - puts("Cannot find Armada 385 watchdog!\n"); > - } else { > - puts("Enabling Armada 385 watchdog.\n"); > - wdt_start(watchdog_dev, (u32) 25000000 * 120, 0); > - } > -# endif > - > if (disable_mcu_watchdog()) > puts("Disabled MCU startup watchdog.\n"); > > @@ -392,28 +379,6 @@ int board_init(void) > return 0; > } > > -#ifdef CONFIG_WATCHDOG > -/* Called by macro WATCHDOG_RESET */ > -void watchdog_reset(void) > -{ > -# if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION) > - static ulong next_reset = 0; > - ulong now; > - > - if (!watchdog_dev) > - return; > - > - now = timer_get_us(); > - > - /* Do not reset the watchdog too often */ > - if (now > next_reset) { > - wdt_reset(watchdog_dev); > - next_reset = now + 1000; > - } > -# endif > -} > -#endif > - > int board_late_init(void) > { > #ifndef CONFIG_SPL_BUILD > diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c b/board/xilinx/microblaze-generic/microblaze-generic.c > index 28c9efa3a2..ba82292e35 100644 > --- a/board/xilinx/microblaze-generic/microblaze-generic.c > +++ b/board/xilinx/microblaze-generic/microblaze-generic.c > @@ -24,10 +24,6 @@ > > DECLARE_GLOBAL_DATA_PTR; > > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) > -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; > -#endif /* !CONFIG_SPL_BUILD && CONFIG_WDT */ > - > ulong ram_base; > > int dram_init_banksize(void) > @@ -43,44 +39,8 @@ int dram_init(void) > return 0; > }; > > -#ifdef CONFIG_WDT > -/* Called by macro WATCHDOG_RESET */ > -void watchdog_reset(void) > -{ > -#if !defined(CONFIG_SPL_BUILD) > - ulong now; > - static ulong next_reset; > - > - if (!watchdog_dev) > - return; > - > - now = timer_get_us(); > - > - /* Do not reset the watchdog too often */ > - if (now > next_reset) { > - wdt_reset(watchdog_dev); > - next_reset = now + 1000; > - } > -#endif /* !CONFIG_SPL_BUILD */ > -} > -#endif /* CONFIG_WDT */ > - > int board_late_init(void) > { > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) > - watchdog_dev = NULL; > - > - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { > - debug("Watchdog: Not found by seq!\n"); > - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { > - puts("Watchdog: Not found!\n"); > - return 0; > - } > - } > - > - wdt_start(watchdog_dev, 0, 0); > - puts("Watchdog: Started\n"); > -#endif /* !CONFIG_SPL_BUILD && CONFIG_WDT */ > #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SYSRESET_MICROBLAZE) > int ret; > > diff --git a/board/xilinx/zynq/board.c b/board/xilinx/zynq/board.c > index ea26aad16f..6857f2c0b8 100644 > --- a/board/xilinx/zynq/board.c > +++ b/board/xilinx/zynq/board.c > @@ -18,10 +18,6 @@ > > DECLARE_GLOBAL_DATA_PTR; > > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) > -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; > -#endif > - > #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_BOARD_EARLY_INIT_F) > int board_early_init_f(void) > { > @@ -31,19 +27,6 @@ int board_early_init_f(void) > > int board_init(void) > { > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) > - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { > - debug("Watchdog: Not found by seq!\n"); > - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { > - puts("Watchdog: Not found!\n"); > - return 0; > - } > - } > - > - wdt_start(watchdog_dev, 0, 0); > - puts("Watchdog: Started\n"); > -# endif > - > return 0; > } > > @@ -127,25 +110,3 @@ int dram_init(void) > return 0; > } > #endif > - > -#if defined(CONFIG_WATCHDOG) > -/* Called by macro WATCHDOG_RESET */ > -void watchdog_reset(void) > -{ > -# if !defined(CONFIG_SPL_BUILD) > - static ulong next_reset; > - ulong now; > - > - if (!watchdog_dev) > - return; > - > - now = timer_get_us(); > - > - /* Do not reset the watchdog too often */ > - if (now > next_reset) { > - wdt_reset(watchdog_dev); > - next_reset = now + 1000; > - } > -# endif > -} > -#endif > diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c > index db27247850..1c12891b82 100644 > --- a/board/xilinx/zynqmp/zynqmp.c > +++ b/board/xilinx/zynqmp/zynqmp.c > @@ -24,10 +24,6 @@ > > DECLARE_GLOBAL_DATA_PTR; > > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) > -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; > -#endif > - > #if defined(CONFIG_FPGA) && defined(CONFIG_FPGA_ZYNQMPPL) && \ > !defined(CONFIG_SPL_BUILD) > static xilinx_desc zynqmppl = XILINX_ZYNQMP_DESC; > @@ -340,44 +336,9 @@ int board_init(void) > } > #endif > > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) > - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { > - debug("Watchdog: Not found by seq!\n"); > - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { > - puts("Watchdog: Not found!\n"); > - return 0; > - } > - } > - > - wdt_start(watchdog_dev, 0, 0); > - puts("Watchdog: Started\n"); > -#endif > - > return 0; > } > > -#ifdef CONFIG_WATCHDOG > -/* Called by macro WATCHDOG_RESET */ > -void watchdog_reset(void) > -{ > -# if !defined(CONFIG_SPL_BUILD) > - static ulong next_reset; > - ulong now; > - > - if (!watchdog_dev) > - return; > - > - now = timer_get_us(); > - > - /* Do not reset the watchdog too often */ > - if (now > next_reset) { > - wdt_reset(watchdog_dev); > - next_reset = now + 1000; > - } > -# endif > -} > -#endif > - > int board_early_init_r(void) > { > u32 val; > diff --git a/common/board_r.c b/common/board_r.c > index 472987d5d5..d457b6715f 100644 > --- a/common/board_r.c > +++ b/common/board_r.c > @@ -48,6 +48,7 @@ > #include <linux/compiler.h> > #include <linux/err.h> > #include <efi_loader.h> > +#include <wdt.h> > > DECLARE_GLOBAL_DATA_PTR; > > @@ -621,6 +622,43 @@ static int initr_bedbug(void) > } > #endif > > +#if defined(CONFIG_WDT) > +#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS > +#define CONFIG_WATCHDOG_TIMEOUT_MSECS (60 * 1000) > +#endif > +#define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000) > + > +static int initr_watchdog(void) > +{ > + u32 timeout = WATCHDOG_TIMEOUT_SECS; > + > + /* > + * Init watchdog: This will call the probe function of the > + * watchdog driver, enabling the use of the device > + */ > + if (uclass_get_device_by_seq(UCLASS_WDT, 0, > + (struct udevice **)&gd->watchdog_dev)) { > + debug("WDT: Not found by seq!\n"); > + if (uclass_get_device(UCLASS_WDT, 0, > + (struct udevice **)&gd->watchdog_dev)) { > + printf("WDT: Not found!\n"); > + return 0; > + } > + } > + > + if (CONFIG_IS_ENABLED(OF_CONTROL)) { > + timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec", > + WATCHDOG_TIMEOUT_SECS); > + } > + > + wdt_start(gd->watchdog_dev, timeout * 1000, 0); > + gd->flags |= GD_FLG_WDT_READY; > + printf("WDT: Started (%ds timeout)\n", timeout); > + > + return 0; > +} > +#endif > + > static int run_main_loop(void) > { > #ifdef CONFIG_SANDBOX > @@ -670,6 +708,9 @@ static init_fnc_t init_sequence_r[] = { > #ifdef CONFIG_DM > initr_dm, > #endif > +#if defined(CONFIG_WDT) > + initr_watchdog, > +#endif > #if defined(CONFIG_ARM) || defined(CONFIG_NDS32) || defined(CONFIG_RISCV) || \ > defined(CONFIG_SANDBOX) > board_init, /* Setup chipselects */ > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > index 34e78beb2a..82080d3867 100644 > --- a/drivers/watchdog/Kconfig > +++ b/drivers/watchdog/Kconfig > @@ -51,6 +51,7 @@ config ULP_WATCHDOG > config WDT > bool "Enable driver model for watchdog timer drivers" > depends on DM > + imply WATCHDOG > help > Enable driver model for watchdog timer. At the moment the API > is very simple and only supports four operations: > diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c > index 23b7e3360d..bbfac4f0f9 100644 > --- a/drivers/watchdog/wdt-uclass.c > +++ b/drivers/watchdog/wdt-uclass.c > @@ -10,6 +10,8 @@ > #include <dm/device-internal.h> > #include <dm/lists.h> > > +DECLARE_GLOBAL_DATA_PTR; > + > int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) > { > const struct wdt_ops *ops = device_get_ops(dev); > @@ -63,6 +65,30 @@ int wdt_expire_now(struct udevice *dev, ulong flags) > return ret; > } > > +#if defined(CONFIG_WATCHDOG) > +/* > + * Called by macro WATCHDOG_RESET. This function be called *very* early, > + * so we need to make sure, that the watchdog driver is ready before using > + * it in this function. > + */ > +void watchdog_reset(void) > +{ > + static ulong next_reset; > + ulong now; > + > + /* Exit if GD is not ready or watchdog is not initialized yet */ > + if (!gd || !(gd->flags & GD_FLG_WDT_READY)) > + return; > + > + /* Do not reset the watchdog too often */ > + now = get_timer(0); > + if (now > next_reset) { > + next_reset = now + 1000; /* reset every 1000ms */ > + wdt_reset(gd->watchdog_dev); > + } > +} > +#endif > + > static int wdt_post_bind(struct udevice *dev) > { > #if defined(CONFIG_NEEDS_MANUAL_RELOC) > diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h > index 78dcf40bff..d16f50f677 100644 > --- a/include/asm-generic/global_data.h > +++ b/include/asm-generic/global_data.h > @@ -133,6 +133,9 @@ typedef struct global_data { > struct spl_handoff *spl_handoff; > # endif > #endif > +#if defined(CONFIG_WDT) > + struct udevice *watchdog_dev; > +#endif > } gd_t; > #endif > > @@ -161,5 +164,6 @@ typedef struct global_data { > #define GD_FLG_ENV_DEFAULT 0x02000 /* Default variable flag */ > #define GD_FLG_SPL_EARLY_INIT 0x04000 /* Early SPL init is done */ > #define GD_FLG_LOG_READY 0x08000 /* Log system is ready for use */ > +#define GD_FLG_WDT_READY 0x10000 /* Watchdog is ready for use */ > > #endif /* __ASM_GENERIC_GBL_DATA_H */ > diff --git a/include/configs/turris_omnia.h b/include/configs/turris_omnia.h > index 038f6398eb..78e3cf2ff4 100644 > --- a/include/configs/turris_omnia.h > +++ b/include/configs/turris_omnia.h > @@ -29,11 +29,6 @@ > #define CONFIG_SPL_I2C_MUX > #define CONFIG_SYS_I2C_MVTWSI > > -/* Watchdog support */ > -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION) > -# define CONFIG_WATCHDOG > -#endif > - > /* SPI NOR flash default params, used by sf commands */ > #define CONFIG_SPI_FLASH_SPANSION > > Reviewed-by: Michal Simek <michal.simek@xilinx.com> Tested-by: Michal Simek <michal.simek@xilinx.com> (on zcu100) Maybe at some point we should extend this message to also state that it is not serviced. Something like: WDT: Started without servicing (10s timeout) Thanks, Michal
On 12.04.19 10:22, Michal Simek wrote: > On 11. 04. 19 15:58, Stefan Roese wrote: >> This patch tries to implement a generic watchdog_reset() function that >> can be used by all boards that want to service the watchdog device in >> U-Boot. This watchdog servicing is enabled via CONFIG_WATCHDOG. >> >> Without this approach, new boards or platforms needed to implement a >> board specific version of this functionality, mostly copy'ing the same >> code over and over again into their board or platforms code base. >> >> With this new generic function, the scattered other functions are now >> removed to be replaced by the generic one. The new version also enables >> the configuration of the watchdog timeout via the DT "timeout-sec" >> property (if enabled via CONFIG_OF_CONTROL). >> >> This patch also adds a new flag to the GD flags, to flag that the >> watchdog is ready to use and adds the pointer to the watchdog device >> to the GD. This enables us to remove the global "watchdog_dev" >> variable, which was prone to cause problems because of its potentially >> very early use in watchdog_reset(), even before the BSS is cleared. <snip> > Reviewed-by: Michal Simek <michal.simek@xilinx.com> > Tested-by: Michal Simek <michal.simek@xilinx.com> (on zcu100) > > Maybe at some point we should extend this message to also state that it > is not serviced. > > Something like: > WDT: Started without servicing (10s timeout) I also have thought about adding this state information to the message. I like your idea. To not "disturb" this series any more, I'll send a follow-up patch for this, once this patchset lands in mainline. Thanks, Stefan
On 12. 04. 19 10:32, Stefan Roese wrote: > On 12.04.19 10:22, Michal Simek wrote: >> On 11. 04. 19 15:58, Stefan Roese wrote: >>> This patch tries to implement a generic watchdog_reset() function that >>> can be used by all boards that want to service the watchdog device in >>> U-Boot. This watchdog servicing is enabled via CONFIG_WATCHDOG. >>> >>> Without this approach, new boards or platforms needed to implement a >>> board specific version of this functionality, mostly copy'ing the same >>> code over and over again into their board or platforms code base. >>> >>> With this new generic function, the scattered other functions are now >>> removed to be replaced by the generic one. The new version also enables >>> the configuration of the watchdog timeout via the DT "timeout-sec" >>> property (if enabled via CONFIG_OF_CONTROL). >>> >>> This patch also adds a new flag to the GD flags, to flag that the >>> watchdog is ready to use and adds the pointer to the watchdog device >>> to the GD. This enables us to remove the global "watchdog_dev" >>> variable, which was prone to cause problems because of its potentially >>> very early use in watchdog_reset(), even before the BSS is cleared. > > <snip> > >> Reviewed-by: Michal Simek <michal.simek@xilinx.com> >> Tested-by: Michal Simek <michal.simek@xilinx.com> (on zcu100) >> >> Maybe at some point we should extend this message to also state that it >> is not serviced. >> >> Something like: >> WDT: Started without servicing (10s timeout) > > I also have thought about adding this state information to the message. > I like your idea. To not "disturb" this series any more, I'll send a > follow-up patch for this, once this patchset lands in mainline. follow up make sense. Thanks, Michal
On 12.04.19 11:46, Michal Simek wrote: > On 12. 04. 19 10:32, Stefan Roese wrote: >> On 12.04.19 10:22, Michal Simek wrote: >>> On 11. 04. 19 15:58, Stefan Roese wrote: >>>> This patch tries to implement a generic watchdog_reset() function that >>>> can be used by all boards that want to service the watchdog device in >>>> U-Boot. This watchdog servicing is enabled via CONFIG_WATCHDOG. >>>> >>>> Without this approach, new boards or platforms needed to implement a >>>> board specific version of this functionality, mostly copy'ing the same >>>> code over and over again into their board or platforms code base. >>>> >>>> With this new generic function, the scattered other functions are now >>>> removed to be replaced by the generic one. The new version also enables >>>> the configuration of the watchdog timeout via the DT "timeout-sec" >>>> property (if enabled via CONFIG_OF_CONTROL). >>>> >>>> This patch also adds a new flag to the GD flags, to flag that the >>>> watchdog is ready to use and adds the pointer to the watchdog device >>>> to the GD. This enables us to remove the global "watchdog_dev" >>>> variable, which was prone to cause problems because of its potentially >>>> very early use in watchdog_reset(), even before the BSS is cleared. >> >> <snip> >> >>> Reviewed-by: Michal Simek <michal.simek@xilinx.com> >>> Tested-by: Michal Simek <michal.simek@xilinx.com> (on zcu100) >>> >>> Maybe at some point we should extend this message to also state that it >>> is not serviced. >>> >>> Something like: >>> WDT: Started without servicing (10s timeout) >> >> I also have thought about adding this state information to the message. >> I like your idea. To not "disturb" this series any more, I'll send a >> follow-up patch for this, once this patchset lands in mainline. > > follow up make sense. I need to do a v5, since we now have a board with watchdog support in SPL in mainline (x530) and I need to make a few changes to support this with the generic approach as well. I'll fold the "with/out servicing" message into this new version as well. Stay tuned... Thanks, Stefan
Hi Stefan, Just noticed something when updating our internal u-boot repo On Fri, Apr 12, 2019 at 2:00 AM Stefan Roese <sr@denx.de> wrote: > > This patch tries to implement a generic watchdog_reset() function that > can be used by all boards that want to service the watchdog device in > U-Boot. This watchdog servicing is enabled via CONFIG_WATCHDOG. > > Without this approach, new boards or platforms needed to implement a > board specific version of this functionality, mostly copy'ing the same > code over and over again into their board or platforms code base. > > With this new generic function, the scattered other functions are now > removed to be replaced by the generic one. The new version also enables > the configuration of the watchdog timeout via the DT "timeout-sec" > property (if enabled via CONFIG_OF_CONTROL). > > This patch also adds a new flag to the GD flags, to flag that the > watchdog is ready to use and adds the pointer to the watchdog device > to the GD. This enables us to remove the global "watchdog_dev" > variable, which was prone to cause problems because of its potentially > very early use in watchdog_reset(), even before the BSS is cleared. <snip> > diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c > index 23b7e3360d..bbfac4f0f9 100644 > --- a/drivers/watchdog/wdt-uclass.c > +++ b/drivers/watchdog/wdt-uclass.c > @@ -10,6 +10,8 @@ > #include <dm/device-internal.h> > #include <dm/lists.h> > > +DECLARE_GLOBAL_DATA_PTR; > + > int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) > { > const struct wdt_ops *ops = device_get_ops(dev); > @@ -63,6 +65,30 @@ int wdt_expire_now(struct udevice *dev, ulong flags) > return ret; > } > > +#if defined(CONFIG_WATCHDOG) > +/* > + * Called by macro WATCHDOG_RESET. This function be called *very* early, > + * so we need to make sure, that the watchdog driver is ready before using > + * it in this function. > + */ > +void watchdog_reset(void) > +{ > + static ulong next_reset; > + ulong now; > + > + /* Exit if GD is not ready or watchdog is not initialized yet */ > + if (!gd || !(gd->flags & GD_FLG_WDT_READY)) > + return; > + > + /* Do not reset the watchdog too often */ > + now = get_timer(0); > + if (now > next_reset) { If the counter wraps we stop tickling the watchdog and the board will reset. On our 32-bit arm boards this is only about 72 minutes so it got noticed in production testing. The fix we had in our board code was: +#ifndef time_after +#define time_after(a,b) \ + ((long)((b) - (a)) < 0) +#endif @@ -202,7 +208,7 @@ void watchdog_reset(void) now = timer_get_us(); /* Do not reset the watchdog too often */ - if (now > next_reset) { + if (time_after(now, next_reset)) { wdt_reset(watchdog_dev); next_reset = now + 1000; } I'll send a proper patch (gmail will eat the whitespace in the inline diff). > + next_reset = now + 1000; /* reset every 1000ms */ > + wdt_reset(gd->watchdog_dev); > + } > +} > +#endif > + > static int wdt_post_bind(struct udevice *dev) > { > #if defined(CONFIG_NEEDS_MANUAL_RELOC)
diff --git a/arch/mips/mach-mt7620/cpu.c b/arch/mips/mach-mt7620/cpu.c index fe74f26a54..fcd0484a6d 100644 --- a/arch/mips/mach-mt7620/cpu.c +++ b/arch/mips/mach-mt7620/cpu.c @@ -69,28 +69,6 @@ int print_cpuinfo(void) return 0; } -#ifdef CONFIG_WATCHDOG -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; - -/* Called by macro WATCHDOG_RESET */ -void watchdog_reset(void) -{ - static ulong next_reset; - ulong now; - - if (!watchdog_dev) - return; - - now = get_timer(0); - - /* Do not reset the watchdog too often */ - if (now > next_reset) { - next_reset = now + 1000; /* reset every 1000ms */ - wdt_reset(watchdog_dev); - } -} -#endif - int arch_misc_init(void) { /* @@ -103,19 +81,5 @@ int arch_misc_init(void) flush_dcache_range(gd->bd->bi_memstart, gd->bd->bi_memstart + gd->ram_size - 1); -#ifdef CONFIG_WATCHDOG - /* Init watchdog */ - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { - debug("Watchdog: Not found by seq!\n"); - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { - puts("Watchdog: Not found!\n"); - return 0; - } - } - - wdt_start(watchdog_dev, 60000, 0); /* 60 seconds */ - printf("Watchdog: Started\n"); -#endif - return 0; } diff --git a/board/CZ.NIC/turris_mox/turris_mox.c b/board/CZ.NIC/turris_mox/turris_mox.c index 96cb9c7e5c..8a4872343b 100644 --- a/board/CZ.NIC/turris_mox/turris_mox.c +++ b/board/CZ.NIC/turris_mox/turris_mox.c @@ -119,41 +119,11 @@ int board_fix_fdt(void *blob) } #endif -#ifdef CONFIG_WDT_ARMADA_37XX -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; - -void watchdog_reset(void) -{ - static ulong next_reset; - ulong now; - - if (!watchdog_dev) - return; - - now = timer_get_us(); - - /* Do not reset the watchdog too often */ - if (now > next_reset) { - wdt_reset(watchdog_dev); - next_reset = now + 100000; - } -} -#endif - int board_init(void) { /* address of boot parameters */ gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100; -#ifdef CONFIG_WDT_ARMADA_37XX - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { - printf("Cannot find Armada 3720 watchdog!\n"); - } else { - printf("Enabling Armada 3720 watchdog (3 minutes timeout).\n"); - wdt_start(watchdog_dev, 180000, 0); - } -#endif - return 0; } diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c index c7f6479a0c..8101cfd88a 100644 --- a/board/CZ.NIC/turris_omnia/turris_omnia.c +++ b/board/CZ.NIC/turris_omnia/turris_omnia.c @@ -364,25 +364,12 @@ static bool disable_mcu_watchdog(void) } #endif -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION) -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; -#endif - int board_init(void) { /* adress of boot parameters */ gd->bd->bi_boot_params = mvebu_sdram_bar(0) + 0x100; #ifndef CONFIG_SPL_BUILD -# ifdef CONFIG_WDT_ORION - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { - puts("Cannot find Armada 385 watchdog!\n"); - } else { - puts("Enabling Armada 385 watchdog.\n"); - wdt_start(watchdog_dev, (u32) 25000000 * 120, 0); - } -# endif - if (disable_mcu_watchdog()) puts("Disabled MCU startup watchdog.\n"); @@ -392,28 +379,6 @@ int board_init(void) return 0; } -#ifdef CONFIG_WATCHDOG -/* Called by macro WATCHDOG_RESET */ -void watchdog_reset(void) -{ -# if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION) - static ulong next_reset = 0; - ulong now; - - if (!watchdog_dev) - return; - - now = timer_get_us(); - - /* Do not reset the watchdog too often */ - if (now > next_reset) { - wdt_reset(watchdog_dev); - next_reset = now + 1000; - } -# endif -} -#endif - int board_late_init(void) { #ifndef CONFIG_SPL_BUILD diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c b/board/xilinx/microblaze-generic/microblaze-generic.c index 28c9efa3a2..ba82292e35 100644 --- a/board/xilinx/microblaze-generic/microblaze-generic.c +++ b/board/xilinx/microblaze-generic/microblaze-generic.c @@ -24,10 +24,6 @@ DECLARE_GLOBAL_DATA_PTR; -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; -#endif /* !CONFIG_SPL_BUILD && CONFIG_WDT */ - ulong ram_base; int dram_init_banksize(void) @@ -43,44 +39,8 @@ int dram_init(void) return 0; }; -#ifdef CONFIG_WDT -/* Called by macro WATCHDOG_RESET */ -void watchdog_reset(void) -{ -#if !defined(CONFIG_SPL_BUILD) - ulong now; - static ulong next_reset; - - if (!watchdog_dev) - return; - - now = timer_get_us(); - - /* Do not reset the watchdog too often */ - if (now > next_reset) { - wdt_reset(watchdog_dev); - next_reset = now + 1000; - } -#endif /* !CONFIG_SPL_BUILD */ -} -#endif /* CONFIG_WDT */ - int board_late_init(void) { -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) - watchdog_dev = NULL; - - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { - debug("Watchdog: Not found by seq!\n"); - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { - puts("Watchdog: Not found!\n"); - return 0; - } - } - - wdt_start(watchdog_dev, 0, 0); - puts("Watchdog: Started\n"); -#endif /* !CONFIG_SPL_BUILD && CONFIG_WDT */ #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SYSRESET_MICROBLAZE) int ret; diff --git a/board/xilinx/zynq/board.c b/board/xilinx/zynq/board.c index ea26aad16f..6857f2c0b8 100644 --- a/board/xilinx/zynq/board.c +++ b/board/xilinx/zynq/board.c @@ -18,10 +18,6 @@ DECLARE_GLOBAL_DATA_PTR; -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; -#endif - #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_BOARD_EARLY_INIT_F) int board_early_init_f(void) { @@ -31,19 +27,6 @@ int board_early_init_f(void) int board_init(void) { -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { - debug("Watchdog: Not found by seq!\n"); - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { - puts("Watchdog: Not found!\n"); - return 0; - } - } - - wdt_start(watchdog_dev, 0, 0); - puts("Watchdog: Started\n"); -# endif - return 0; } @@ -127,25 +110,3 @@ int dram_init(void) return 0; } #endif - -#if defined(CONFIG_WATCHDOG) -/* Called by macro WATCHDOG_RESET */ -void watchdog_reset(void) -{ -# if !defined(CONFIG_SPL_BUILD) - static ulong next_reset; - ulong now; - - if (!watchdog_dev) - return; - - now = timer_get_us(); - - /* Do not reset the watchdog too often */ - if (now > next_reset) { - wdt_reset(watchdog_dev); - next_reset = now + 1000; - } -# endif -} -#endif diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c index db27247850..1c12891b82 100644 --- a/board/xilinx/zynqmp/zynqmp.c +++ b/board/xilinx/zynqmp/zynqmp.c @@ -24,10 +24,6 @@ DECLARE_GLOBAL_DATA_PTR; -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) -static struct udevice *watchdog_dev __attribute__((section(".data"))) = NULL; -#endif - #if defined(CONFIG_FPGA) && defined(CONFIG_FPGA_ZYNQMPPL) && \ !defined(CONFIG_SPL_BUILD) static xilinx_desc zynqmppl = XILINX_ZYNQMP_DESC; @@ -340,44 +336,9 @@ int board_init(void) } #endif -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT) - if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { - debug("Watchdog: Not found by seq!\n"); - if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) { - puts("Watchdog: Not found!\n"); - return 0; - } - } - - wdt_start(watchdog_dev, 0, 0); - puts("Watchdog: Started\n"); -#endif - return 0; } -#ifdef CONFIG_WATCHDOG -/* Called by macro WATCHDOG_RESET */ -void watchdog_reset(void) -{ -# if !defined(CONFIG_SPL_BUILD) - static ulong next_reset; - ulong now; - - if (!watchdog_dev) - return; - - now = timer_get_us(); - - /* Do not reset the watchdog too often */ - if (now > next_reset) { - wdt_reset(watchdog_dev); - next_reset = now + 1000; - } -# endif -} -#endif - int board_early_init_r(void) { u32 val; diff --git a/common/board_r.c b/common/board_r.c index 472987d5d5..d457b6715f 100644 --- a/common/board_r.c +++ b/common/board_r.c @@ -48,6 +48,7 @@ #include <linux/compiler.h> #include <linux/err.h> #include <efi_loader.h> +#include <wdt.h> DECLARE_GLOBAL_DATA_PTR; @@ -621,6 +622,43 @@ static int initr_bedbug(void) } #endif +#if defined(CONFIG_WDT) +#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS +#define CONFIG_WATCHDOG_TIMEOUT_MSECS (60 * 1000) +#endif +#define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000) + +static int initr_watchdog(void) +{ + u32 timeout = WATCHDOG_TIMEOUT_SECS; + + /* + * Init watchdog: This will call the probe function of the + * watchdog driver, enabling the use of the device + */ + if (uclass_get_device_by_seq(UCLASS_WDT, 0, + (struct udevice **)&gd->watchdog_dev)) { + debug("WDT: Not found by seq!\n"); + if (uclass_get_device(UCLASS_WDT, 0, + (struct udevice **)&gd->watchdog_dev)) { + printf("WDT: Not found!\n"); + return 0; + } + } + + if (CONFIG_IS_ENABLED(OF_CONTROL)) { + timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec", + WATCHDOG_TIMEOUT_SECS); + } + + wdt_start(gd->watchdog_dev, timeout * 1000, 0); + gd->flags |= GD_FLG_WDT_READY; + printf("WDT: Started (%ds timeout)\n", timeout); + + return 0; +} +#endif + static int run_main_loop(void) { #ifdef CONFIG_SANDBOX @@ -670,6 +708,9 @@ static init_fnc_t init_sequence_r[] = { #ifdef CONFIG_DM initr_dm, #endif +#if defined(CONFIG_WDT) + initr_watchdog, +#endif #if defined(CONFIG_ARM) || defined(CONFIG_NDS32) || defined(CONFIG_RISCV) || \ defined(CONFIG_SANDBOX) board_init, /* Setup chipselects */ diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 34e78beb2a..82080d3867 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -51,6 +51,7 @@ config ULP_WATCHDOG config WDT bool "Enable driver model for watchdog timer drivers" depends on DM + imply WATCHDOG help Enable driver model for watchdog timer. At the moment the API is very simple and only supports four operations: diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c index 23b7e3360d..bbfac4f0f9 100644 --- a/drivers/watchdog/wdt-uclass.c +++ b/drivers/watchdog/wdt-uclass.c @@ -10,6 +10,8 @@ #include <dm/device-internal.h> #include <dm/lists.h> +DECLARE_GLOBAL_DATA_PTR; + int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) { const struct wdt_ops *ops = device_get_ops(dev); @@ -63,6 +65,30 @@ int wdt_expire_now(struct udevice *dev, ulong flags) return ret; } +#if defined(CONFIG_WATCHDOG) +/* + * Called by macro WATCHDOG_RESET. This function be called *very* early, + * so we need to make sure, that the watchdog driver is ready before using + * it in this function. + */ +void watchdog_reset(void) +{ + static ulong next_reset; + ulong now; + + /* Exit if GD is not ready or watchdog is not initialized yet */ + if (!gd || !(gd->flags & GD_FLG_WDT_READY)) + return; + + /* Do not reset the watchdog too often */ + now = get_timer(0); + if (now > next_reset) { + next_reset = now + 1000; /* reset every 1000ms */ + wdt_reset(gd->watchdog_dev); + } +} +#endif + static int wdt_post_bind(struct udevice *dev) { #if defined(CONFIG_NEEDS_MANUAL_RELOC) diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h index 78dcf40bff..d16f50f677 100644 --- a/include/asm-generic/global_data.h +++ b/include/asm-generic/global_data.h @@ -133,6 +133,9 @@ typedef struct global_data { struct spl_handoff *spl_handoff; # endif #endif +#if defined(CONFIG_WDT) + struct udevice *watchdog_dev; +#endif } gd_t; #endif @@ -161,5 +164,6 @@ typedef struct global_data { #define GD_FLG_ENV_DEFAULT 0x02000 /* Default variable flag */ #define GD_FLG_SPL_EARLY_INIT 0x04000 /* Early SPL init is done */ #define GD_FLG_LOG_READY 0x08000 /* Log system is ready for use */ +#define GD_FLG_WDT_READY 0x10000 /* Watchdog is ready for use */ #endif /* __ASM_GENERIC_GBL_DATA_H */ diff --git a/include/configs/turris_omnia.h b/include/configs/turris_omnia.h index 038f6398eb..78e3cf2ff4 100644 --- a/include/configs/turris_omnia.h +++ b/include/configs/turris_omnia.h @@ -29,11 +29,6 @@ #define CONFIG_SPL_I2C_MUX #define CONFIG_SYS_I2C_MVTWSI -/* Watchdog support */ -#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION) -# define CONFIG_WATCHDOG -#endif - /* SPI NOR flash default params, used by sf commands */ #define CONFIG_SPI_FLASH_SPANSION
This patch tries to implement a generic watchdog_reset() function that can be used by all boards that want to service the watchdog device in U-Boot. This watchdog servicing is enabled via CONFIG_WATCHDOG. Without this approach, new boards or platforms needed to implement a board specific version of this functionality, mostly copy'ing the same code over and over again into their board or platforms code base. With this new generic function, the scattered other functions are now removed to be replaced by the generic one. The new version also enables the configuration of the watchdog timeout via the DT "timeout-sec" property (if enabled via CONFIG_OF_CONTROL). This patch also adds a new flag to the GD flags, to flag that the watchdog is ready to use and adds the pointer to the watchdog device to the GD. This enables us to remove the global "watchdog_dev" variable, which was prone to cause problems because of its potentially very early use in watchdog_reset(), even before the BSS is cleared. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Heiko Schocher <hs@denx.de> Cc: Tom Rini <trini@konsulko.com> Cc: Michal Simek <michal.simek@xilinx.com> Cc: "Marek Behún" <marek.behun@nic.cz> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Maxim Sloyko <maxims@google.com> Cc: Erik van Luijk <evanluijk@interact.nl> Cc: Ryder Lee <ryder.lee@mediatek.com> Cc: Weijie Gao <weijie.gao@mediatek.com> Cc: Simon Glass <sjg@chromium.org> Cc: "Álvaro Fernández Rojas" <noltari@gmail.com> Cc: Philippe Reynes <philippe.reynes@softathome.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> --- This patch depends on the following patch: [1] watchdog: Handle SPL build with watchdog disabled https://patchwork.ozlabs.org/patch/1074098/ We have a few boards that have CONFIG_WDT (DM watchdog driver) enabled and CONFIG_WATCHDOG (U-Boot watchdog servicing) disabled. This might lead to a watchdog reboot, if the board does not boot fast enough into some OS (like Linux) which services the watchdog. With this patch now, the watchdog is started on all those boards (if found via the DT) and also serviced as this patch also "implies" CONFIG_WATCHDOG. If this is not desired, then please send a patch to disable CONFIG_WATCHDOG for this board. Here the list of those boards with their maintainers: taurus: Heiko Schocher <hs@denx.de> smartweb: Heiko Schocher <hs@denx.de> ast2500: Maxim Sloyko <maxims@google.com> picosam9g45: Erik van Luijk <evanluijk@interact.nl> mt7623n_bpir2: Ryder Lee <ryder.lee@mediatek.com> Weijie Gao <weijie.gao@mediatek.com> mt7629_rfb: Ryder Lee <ryder.lee@mediatek.com> Weijie Gao <weijie.gao@mediatek.com> bitmain_antminer_s9: Michal Simek <monstr@monstr.eu> sandbox64: Simon Glass <sjg@chromium.org> sandbox: Simon Glass <sjg@chromium.org> comtrend_ct5361_ram: "Álvaro Fernández Rojas" <noltari@gmail.com> netgear_cg3100d_ram: "Álvaro Fernández Rojas" <noltari@gmail.com> bcm968380gerg_ram: Philippe Reynes <philippe.reynes@softathome.com> bcm963158_ram: Philippe Reynes <philippe.reynes@softathome.com> bcm968580xref_ram: Philippe Reynes <philippe.reynes@softathome.com> MCR3000: Christophe Leroy <christophe.leroy@c-s.fr> Thanks, Stefan v4: - No change v3: - Use already available CONFIG_WATCHDOG_TIMEOUT_MSECS option vs the newly introduced WDT_DEFAULT_TIMEOUT default timeout value (if not provided via DT property). - Guard initr_watchdog by CONFIG_WDT instead of CONFIG_WATCHDOG && CONFIG_WDT as suggested by Michal. This makes it possible to enable and start the U-Boot watchdog without enabling the U-Boot watchdog servicing. - Add imply CONFIG_WATCHDOG to CONFIG_WDT, as this restores the current behaviour to use the U-Boot watchdog servicing feature, if the DM watchdog is enabled (CONFIG_WDT). If this is not desired, CONFIG_WATCHDOG can be disabled in the board defconfig. - Remove CONFIG_WATCHDOG from include/configs/turris_omnia.h v2: - Rename watchdog_start() to initr_watchdog() and move it to board_r.c. This way its only called once, after the DM subsystem has bound all watchdog drivers. This enables the use of the currently implemented logic of using the correct watchdog in U-Boot (via alias etc). arch/mips/mach-mt7620/cpu.c | 36 ---------------- board/CZ.NIC/turris_mox/turris_mox.c | 30 -------------- board/CZ.NIC/turris_omnia/turris_omnia.c | 35 ---------------- .../microblaze-generic/microblaze-generic.c | 40 ------------------ board/xilinx/zynq/board.c | 39 ------------------ board/xilinx/zynqmp/zynqmp.c | 39 ------------------ common/board_r.c | 41 +++++++++++++++++++ drivers/watchdog/Kconfig | 1 + drivers/watchdog/wdt-uclass.c | 26 ++++++++++++ include/asm-generic/global_data.h | 4 ++ include/configs/turris_omnia.h | 5 --- 11 files changed, 72 insertions(+), 224 deletions(-)