dt-bindings: watchdog: Require samsung,syscon-phandle for Exynos7

stable inclusion
from stable-v5.10.94
commit 21513c4615575c0b1640ddeb2114242de4ddf58c
bugzilla: https://gitee.com/openeuler/kernel/issues/I531X9

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=21513c4615575c0b1640ddeb2114242de4ddf58c

--------------------------------

commit 33950f9a upstream.

Exynos7 watchdog driver is clearly indicating that its dts node must
define syscon phandle property. That was probably forgotten, so add it.
Signed-off-by: NSam Protsenko <semen.protsenko@linaro.org>
Fixes: 2b9366b6 ("watchdog: s3c2410_wdt: Add support for Watchdog device on Exynos7")
Reviewed-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20211107202943.8859-2-semen.protsenko@linaro.orgSigned-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml

@@ -39,8 +39,8 @@ properties:
   samsung,syscon-phandle:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
-      Phandle to the PMU system controller node (in case of Exynos5250
-      and Exynos5420).
+      Phandle to the PMU system controller node (in case of Exynos5250,
+      Exynos5420 and Exynos7).
 
 required:
   - compatible
@@ -58,6 +58,7 @@ allOf:
             enum:
               - samsung,exynos5250-wdt
               - samsung,exynos5420-wdt
+              - samsung,exynos7-wdt
     then:
       required:
         - samsung,syscon-phandle