linux-kernel - [PATCH 2/7] dt-bindings: clock: exynos850: Add tzpc property

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Date:   Wed,  8 Mar 2023 17:38:17 -0600
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>,
        David Virag <virag.david003@...il.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] dt-bindings: clock: exynos850: Add tzpc property

Exynos850 requires extra TZPC handling to keep CMU registers non-secure
(accessible from the kernel) after PM resume. It's done using a specific
SMC call to the EL3 monitor.

Describe "samsung,tzpc" property for Exynos850 clock controller which
allows one to specify the SMC call address for PD capable CMUs.

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
 .../bindings/clock/samsung,exynos850-clock.yaml        | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/samsung,exynos850-clock.yaml b/Documentation/devicetree/bindings/clock/samsung,exynos850-clock.yaml
index cc1e9173b272..5098dce5caf6 100644
--- a/Documentation/devicetree/bindings/clock/samsung,exynos850-clock.yaml
+++ b/Documentation/devicetree/bindings/clock/samsung,exynos850-clock.yaml
@@ -60,6 +60,16 @@ properties:
   reg:
     maxItems: 1
 
+  samsung,tzpc:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      The register address in corresponding Trust Zone Protection Control block
+      for setting the CMU registers access to non-secure. If provided, it'll be
+      used for issuing SMC calls to EL3 monitor during CMU's PM suspend and
+      resume operations, ensuring CMU registers are unprotected after waking up.
+
+      This property is optional.
+
 allOf:
   - if:
       properties:
-- 
2.39.2