linux-kernel - [TEGRA194_CPUFREQ PATCH v5 1/4] dt-bindings: arm: Add t194 ccplex compatible and bpmp property

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Message-ID: <1594649209-29394-2-git-send-email-sumitg@nvidia.com>
Date:   Mon, 13 Jul 2020 19:36:46 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     <rjw@...ysocki.net>, <viresh.kumar@...aro.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <thierry.reding@...il.com>, <robh+dt@...nel.org>,
        <mirq-linux@...e.qmqm.pl>, <devicetree@...r.kernel.org>,
        <jonathanh@...dia.com>, <talho@...dia.com>,
        <linux-pm@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <bbasu@...dia.com>, <sumitg@...dia.com>, <mperttunen@...dia.com>
Subject: [TEGRA194_CPUFREQ PATCH v5 1/4] dt-bindings: arm: Add t194 ccplex compatible and bpmp property

To do frequency scaling on all CPUs within T194 CPU Complex, we need
to query BPMP for data on valid operating points. Document a compatible
string under 'cpus' node to represent the CPU Complex for binding drivers
like cpufreq which don't have their node or CPU Complex node to bind to.
Also, document a property to point to the BPMP device that can be queried
for all CPUs.

Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 Documentation/devicetree/bindings/arm/cpus.yaml | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/cpus.yaml b/Documentation/devicetree/bindings/arm/cpus.yaml
index a018147..9b328e3 100644
--- a/Documentation/devicetree/bindings/arm/cpus.yaml
+++ b/Documentation/devicetree/bindings/arm/cpus.yaml
@@ -162,6 +162,7 @@ properties:
       - nvidia,tegra132-denver
       - nvidia,tegra186-denver
       - nvidia,tegra194-carmel
+      - nvidia,tegra194-ccplex
       - qcom,krait
       - qcom,kryo
       - qcom,kryo260
@@ -255,6 +256,15 @@ properties:
 
       where voltage is in V, frequency is in MHz.
 
+  nvidia,bpmp:
+    $ref: '/schemas/types.yaml#/definitions/phandle'
+    description: |
+      Specifies the bpmp node that needs to be queried to get
+      operating point data for all CPUs.
+
+      Optional for systems that have a "compatible"
+      property value of "nvidia,tegra194-ccplex".
+
   power-domains:
     $ref: '/schemas/types.yaml#/definitions/phandle-array'
     description:
@@ -340,6 +350,7 @@ required:
 
 dependencies:
   rockchip,pmu: [enable-method]
+  nvidia,bpmp: [compatible]
 
 examples:
   - |
-- 
2.7.4