linux-kernel - [PATCH 3/5] dt-bindings: memory: Add Tegra114 memory controller bindings

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Message-Id: <20211217165919.2700920-3-thierry.reding@gmail.com>
Date:   Fri, 17 Dec 2021 17:59:17 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Jon Hunter <jonathanh@...dia.com>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] dt-bindings: memory: Add Tegra114 memory controller bindings

From: Thierry Reding <treding@...dia.com>

Document the bindings for the memory controller found on Tegra114 SoCs.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 .../nvidia,tegra114-mc.yaml                   | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/nvidia,tegra114-mc.yaml

diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra114-mc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra114-mc.yaml
new file mode 100644
index 000000000000..2fa50eb3aadb
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra114-mc.yaml
@@ -0,0 +1,85 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra114-mc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra114 SoC Memory Controller
+
+maintainers:
+  - Thierry Reding <thierry.reding@...il.com>
+  - Jon Hunter <jonathanh@...dia.com>
+
+description: |
+  The Tegra114 Memory Controller architecturally consists of the following parts:
+
+    Arbitration Domains, which can handle a single request or response per
+    clock from a group of clients. Typically, a system has a single Arbitration
+    Domain, but an implementation may divide the client space into multiple
+    Arbitration Domains to increase the effective system bandwidth.
+
+    Protocol Arbiter, which manage a related pool of memory devices. A system
+    may have a single Protocol Arbiter or multiple Protocol Arbiters.
+
+    Memory Crossbar, which routes request and responses between Arbitration
+    Domains and Protocol Arbiters. In the simplest version of the system, the
+    Memory Crossbar is just a pass through between a single Arbitration Domain
+    and a single Protocol Arbiter.
+
+    Global Resources, which include things like configuration registers which
+    are shared across the Memory Subsystem.
+
+  The Tegra114 Memory Controller handles memory requests from internal clients
+  and arbitrates among them to allocate memory bandwidth for DDR3L and LPDDR2
+  SDRAMs.
+
+properties:
+  compatible:
+    const: nvidia,tegra114-mc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: mc
+
+  interrupts:
+    maxItems: 1
+
+  "#reset-cells":
+    const: 1
+
+  "#iommu-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - "#reset-cells"
+  - "#iommu-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/tegra114-car.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    memory-controller@...19000 {
+      compatible = "nvidia,tegra114-mc";
+      reg = <0x70019000 0x1000>;
+      interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
+
+      clocks = <&tegra_car TEGRA114_CLK_MC>;
+      clock-names = "mc";
+
+      #reset-cells = <1>;
+      #iommu-cells = <1>;
+    };
-- 
2.34.1