[PATCH RESEND] powerpc: dts: turris1x.dts: Set lower priority for CPLD syscon-reboot
From: Pali Rohár <pali@kernel.org>
Date: 2023-02-20 08:15:21
Due to CPLD firmware bugs, set CPLD syscon-reboot priority level to 64
(between rstcr and watchdog) to ensure that rstcr's global-utilities reset
method which is preferred stay as default one, and to ensure that CPLD
syscon-reboot is more preferred than watchdog reset method.
Fixes: 0531a4abd1c6 ("powerpc: dts: turris1x.dts: Add CPLD reboot node")
Signed-off-by: Pali Rohár <pali@kernel.org>
---
Original patch: https://lore.kernel.org/lkml/878rgtyx2y.fsf@mpe.ellerman.id.au/
Commit https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git/commit/?h=for-next&id=e6333293f27cd395e77c6521afd52ff0bdc58107
("power: reset: syscon-reboot: Add support for specifying priority")
implements priority level and this patch just wiring it for turris1x.dts
---
arch/powerpc/boot/dts/turris1x.dts | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/arch/powerpc/boot/dts/turris1x.dts b/arch/powerpc/boot/dts/turris1x.dts
index e9cda34a140e..c9b619f6ed5c 100644
--- a/arch/powerpc/boot/dts/turris1x.dts
+++ b/arch/powerpc/boot/dts/turris1x.dts@@ -367,11 +367,34 @@ }; reboot@d { + /* + * CPLD firmware which manages system reset and + * watchdog registers has bugs. It does not + * autoclear system reset register after change + * and watchdog ignores reset line on immediate + * succeeding reset cycle triggered by watchdog. + * These bugs have to be workarounded in U-Boot + * bootloader. So use system reset via syscon as + * a last resort because older U-Boot versions + * do not have workaround for watchdog. + * + * Reset method via rstcr's global-utilities + * (the preferred one) has priority level 128, + * watchdog has priority level 0 and default + * syscon-reboot priority level is 192. + * + * So define syscon-reboot with custom priority + * level 64 (between rstcr and watchdog) because + * rstcr should stay as default preferred reset + * method and reset via watchdog is more broken + * than system reset via syscon. + */ compatible = "syscon-reboot"; reg = <0x0d 0x01>; offset = <0x0d>; mask = <0x01>; value = <0x01>; + priority = <64>; }; led-controller@13 {
--
2.20.1