linux-kernel - [PATCH 2/7] dt-bindings: watchdog: Document Exynos850 watchdog bindings

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Date:   Thu, 28 Oct 2021 21:35:22 +0300
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PATCH 2/7] dt-bindings: watchdog: Document Exynos850 watchdog bindings

Exynos850 SoC has two CPU clusters:
  - cluster 0: contains CPUs #0, #1, #2, #3
  - cluster 1: contains CPUs #4, #5, #6, #7

Each cluster has its own dedicater watchdog timer. Those WDT instances
are controlled using different bits in PMU registers, so there should be
two different compatible strings (for each cluster), to tell the driver
which bits to use for each WDT instance.

Also on Exynos850 the peripheral clock and the source clock are two
different clocks. Provide a way to specify two clocks in watchdog device
tree node.

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
 .../devicetree/bindings/watchdog/samsung-wdt.yaml  | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml b/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
index 93cd77a6e92c..19c7f7767559 100644
--- a/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
@@ -22,16 +22,24 @@ properties:
       - samsung,exynos5250-wdt                # for Exynos5250
       - samsung,exynos5420-wdt                # for Exynos5420
       - samsung,exynos7-wdt                   # for Exynos7
+      - samsung,exynos850-cl0-wdt             # for Exynos850 (CPU cluster 0)
+      - samsung,exynos850-cl1-wdt             # for Exynos850 (CPU cluster 1)
 
   reg:
     maxItems: 1
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    items:
+      - description: Peripheral clock used for register interface; if it's the
+                     only clock, it's also a source clock
+      - description: Source clock (optional)
 
   clock-names:
+    minItems: 1
     items:
       - const: watchdog
+      - const: watchdog_src
 
   interrupts:
     maxItems: 1
@@ -40,7 +48,7 @@ properties:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
       Phandle to the PMU system controller node (in case of Exynos5250,
-      Exynos5420 and Exynos7).
+      Exynos5420, Exynos7 and Exynos850).
 
 required:
   - compatible
@@ -59,6 +67,8 @@ allOf:
               - samsung,exynos5250-wdt
               - samsung,exynos5420-wdt
               - samsung,exynos7-wdt
+              - samsung,exynos850-cl0-wdt
+              - samsung,exynos850-cl1-wdt
     then:
       required:
         - samsung,syscon-phandle
-- 
2.30.2