linux-kernel - [PATCH v2 1/4] dt-bindings: clock: google,gs101-clock: add samsung,sysreg property as required

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Message-Id: <20251029-automatic-clocks-v2-1-f8edd3a2d82b@linaro.org>
Date: Wed, 29 Oct 2025 21:29:22 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
 André Draszik <andre.draszik@...aro.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Sam Protsenko <semen.protsenko@...aro.org>, 
 Sylwester Nawrocki <s.nawrocki@...sung.com>, 
 Chanwoo Choi <cw00.choi@...sung.com>
Cc: Will McVicker <willmcvicker@...gle.com>, 
 Krzysztof Kozlowski <krzk@...nel.org>, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, 
 kernel-team@...roid.com, Peter Griffin <peter.griffin@...aro.org>, 
 Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH v2 1/4] dt-bindings: clock: google,gs101-clock: add
 samsung,sysreg property as required

Each CMU (with the exception of cmu_top) has a corresponding sysreg bank
that contains the BUSCOMPONENT_DRCG_EN and MEMCLK registers.

If present these registers need to be initialised in the clock driver.
Update the bindings documentation so that all CMUs (with the exception of
gs101-cmu-top) have samsung,sysreg as a required property.

Additionally update the DT example to included the correct CMU size as
registers in that region are used for auto clock mode.

Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
---
v2:
* Update commit description as to why the sysreg is required (Krzysztof)
* Update commit description regarding updated example (Andre)
---
 .../bindings/clock/google,gs101-clock.yaml         | 23 +++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml b/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml
index 31e106ef913dead9a038b3b6d8b43b950587f6aa..5ce5ba523110af3a2a7740b8ba28e2271c76bddb 100644
--- a/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml
+++ b/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml
@@ -52,6 +52,11 @@ properties:
   reg:
     maxItems: 1
 
+  samsung,sysreg:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to system registers interface.
+
 required:
   - compatible
   - "#clock-cells"
@@ -166,6 +171,22 @@ allOf:
             - const: bus
             - const: ip
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - google,gs101-cmu-apm
+              - google,gs101-cmu-misc
+              - google,gs101-hsi0
+              - google,gs101-cmu-hsi2
+              - google,gs101-cmu-peric0
+              - google,gs101-cmu-peric1
+
+    then:
+      required:
+        - samsung,sysreg
+
 additionalProperties: false
 
 examples:
@@ -175,7 +196,7 @@ examples:
 
     cmu_top: clock-controller@...80000 {
         compatible = "google,gs101-cmu-top";
-        reg = <0x1e080000 0x8000>;
+        reg = <0x1e080000 0x10000>;
         #clock-cells = <1>;
         clocks = <&ext_24_5m>;
         clock-names = "oscclk";

-- 
2.51.1.851.g4ebd6896fd-goog