linux-kernel - [PATCH v7 14/47] dt-bindings: memory: tegra124: emc: Document OPP table and voltage regulator

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Date:   Wed,  4 Nov 2020 19:48:50 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: [PATCH v7 14/47] dt-bindings: memory: tegra124: emc: Document OPP table and voltage regulator

Document new OPP table and voltage regulator properties which are needed
for supporting dynamic voltage-frequency scaling of the memory controller.
Some boards may have a fixed core voltage regulator, hence it's optional
because frequency scaling still may be desired.

Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 .../memory-controllers/nvidia,tegra124-emc.yaml      | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml
index ac00832ceac1..09bde65e1955 100644
--- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml
@@ -37,6 +37,15 @@ properties:
     description:
       phandle of the memory controller node
 
+  core-supply:
+    description:
+      Phandle of voltage regulator of the SoC "core" power domain.
+
+  operating-points-v2:
+    description:
+      Should contain freqs and voltages and opp-supported-hw property, which
+      is a bitfield indicating SoC speedo ID mask.
+
 patternProperties:
   "^emc-timings-[0-9]+$":
     type: object
@@ -331,6 +340,7 @@ required:
   - clock-names
   - nvidia,memory-controller
   - "#interconnect-cells"
+  - operating-points-v2
 
 additionalProperties: false
 
@@ -359,6 +369,8 @@ examples:
         clock-names = "emc";
 
         nvidia,memory-controller = <&mc>;
+        operating-points-v2 = <&dvfs_opp_table>;
+        core-supply = <&vdd_core>;
 
         #interconnect-cells = <0>;
 
-- 
2.27.0