[PATCH v2 1/4] dt-bindings: rtc: ingenic: Rework compatible strings and add #clock-cells

[Paul Cercueil <paul@crapouillou.net>]

The RTC in the JZ4770 is compatible with the JZ4760, but has an extra
register that permits to configure the behaviour of the CLK32K pin. The
same goes for the RTC in the JZ4780.

Therefore, the ingenic,jz4770-rtc and ingenic,jz4780-rtc strings do not
fall back anymore to ingenic,jz4760-rtc. The ingenic,jz4780-rtc string
now falls back to the ingenic,jz4770-rtc string.

Additionally, since the RTCs in the JZ4770 and JZ4780 support outputting
the input oscillator's clock to the CLK32K pin, the RTC node is now also
a clock provider on these SoCs, so a #clock-cells property is added.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---

 v2: - add constraint on which SoCs can have the #clock-cells property
     - add JZ4780 example which has a #clock-cells

 .../devicetree/bindings/rtc/ingenic,rtc.yaml  | 32 +++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/ingenic,rtc.yaml b/Documentation/devicetree/bindings/rtc/ingenic,rtc.yaml
index b235b2441997..d63bb727cee5 100644
--- a/Documentation/devicetree/bindings/rtc/ingenic,rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/ingenic,rtc.yaml
@@ -11,6 +11,16 @@ maintainers:
 
 allOf:
   - $ref: rtc.yaml#
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - ingenic,jz4770-rtc
+    then:
+      properties:
+        "#clock-cells": false
 
 properties:
   compatible:
@@ -18,14 +28,14 @@ properties:
       - enum:
           - ingenic,jz4740-rtc
           - ingenic,jz4760-rtc
+          - ingenic,jz4770-rtc
       - items:
           - const: ingenic,jz4725b-rtc
           - const: ingenic,jz4740-rtc
       - items:
           - enum:
-              - ingenic,jz4770-rtc
               - ingenic,jz4780-rtc
-          - const: ingenic,jz4760-rtc
+          - const: ingenic,jz4770-rtc
 
   reg:
     maxItems: 1
@@ -39,6 +49,9 @@ properties:
   clock-names:
     const: rtc
 
+  "#clock-cells":
+    const: 0
+
   system-power-controller:
     description: |
       Indicates that the RTC is responsible for powering OFF
@@ -83,3 +96,18 @@ examples:
       clocks = <&cgu JZ4740_CLK_RTC>;
       clock-names = "rtc";
     };
+
+  - |
+    #include <dt-bindings/clock/ingenic,jz4780-cgu.h>
+    rtc: rtc@10003000 {
+      compatible = "ingenic,jz4780-rtc", "ingenic,jz4770-rtc";
+      reg = <0x10003000 0x4c>;
+
+      interrupt-parent = <&intc>;
+      interrupts = <32>;
+
+      clocks = <&cgu JZ4780_CLK_RTCLK>;
+      clock-names = "rtc";
+
+      #clock-cells = <0>;
+    };
-- 
2.35.1