On 09. 04. 19 16:22, Stefan Roese wrote:
On 09.04.19 12:45, Michal Simek wrote:
On 08. 04. 19 11:28, 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
This patch depends on the following patches:
[1] watchdog: Move watchdog_dev to data section (BSS may not be cleared) https://patchwork.ozlabs.org/patch/1075500/
[2] watchdog: Handle SPL build with watchdog disabled https://patchwork.ozlabs.org/patch/1074098/
I would like to see [1] applied in this release, since its a real fix on some of the platforms with minimal chances of breakage.
This patch now is a bigger rework and is intended for the next merge window.
Please note that I didn't remove the "timeout-sec" handling from the driver already reading it from the DT (cdns & at91) in this patch. The reason for this is, that in the cdns case, the removal also brings a functional change, which I wanted to do in a separate patch. And in the at91 case its because there are updates to this driver already queued in the at91 next git branch which would most likely cause merge conflict. I'll send a cleanup patch for this driver later after these patches have been applied.
Thanks, Stefan
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 | 40 +++++++++++++++++++ drivers/watchdog/wdt-uclass.c | 26 ++++++++++++ include/asm-generic/global_data.h | 4 ++ 9 files changed, 70 insertions(+), 219 deletions(-)
<snip>
int board_early_init_r(void) { u32 val; diff --git a/common/board_r.c b/common/board_r.c index 472987d5d5..d80f16c3ed 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 +622,42 @@ static int initr_bedbug(void) } #endif +#if defined(CONFIG_WATCHDOG) && defined(CONFIG_WDT)
This is not correct. Here should be just CONFIG_WDT.
Because there are cases where you want just start watchdog in u-boot but never service it by u-boot.
AFAIK, this would change the current behavior. Currently, only when CONFIG_WATCHDOG is enabled the watchdog driver is started automatically in U-Boot (and serviced). If I make the change you suggest above, all boards defining CONFIG_WDT (DM watchdog support) will automatically enable the watchdog. This might make sense, but AFAICT this changes the current behavior.
The question is what default is. Because when I was adding support for Zynq/ZynqMP/Microblaze this logic is used there. I think that WDT should be there and if you think there are boards which want to have both we can cover that by Kconfig.
Thanks, Michal