powerpc: dts: turris1x.dts: Set lower priority for CPLD syscon-reboot

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: 0531a4a ("powerpc: dts: turris1x.dts: Add CPLD reboot node")
Depends-on: e633329 ("power: reset: syscon-reboot: Add support for specifying priority")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230220080435.4237-1-pali@kernel.org

Author: pali

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 {