[PATCH v3 3/8] dt-bindings: Add bindings for Tegra234 NVDEC

[Mikko Perttunen <cyndis@kapsi.fi>]

From: Mikko Perttunen <mperttunen@nvidia.com>

Update NVDEC bindings for Tegra234. This new engine version only has
two memory clients, but now requires three clocks, and as a bigger
change the engine loads firmware from a secure carveout configured by
the bootloader.

For the latter, we need to add a phandle to the memory controller
to query the location of this carveout, and several other properties
containing offsets into the firmware inside the carveout. This
carveout is not accessible by the CPU, but is needed by NVDEC,
so we need this information to be relayed from the bootloader.

As the binding was getting large with many conditional properties,
also split the Tegra234 version out into a separate file.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
v3:
- Adjusted descriptions for firmware-related DT properties
  as requested.
- Small update to commit message.
v2:
- Split out into separate file to avoid complexity with
  conditionals etc.
---
 .../gpu/host1x/nvidia,tegra234-nvdec.yaml     | 156 ++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra234-nvdec.yaml

diff --git a/Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra234-nvdec.yaml b/Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra234-nvdec.yaml
new file mode 100644
index 000000000000..7cc2dd525a96
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra234-nvdec.yaml
@@ -0,0 +1,156 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/gpu/host1x/nvidia,tegra234-nvdec.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Device tree binding for NVIDIA Tegra234 NVDEC
+
+description: |
+  NVDEC is the hardware video decoder present on NVIDIA Tegra210
+  and newer chips. It is located on the Host1x bus and typically
+  programmed through Host1x channels.
+
+maintainers:
+  - Thierry Reding <treding@gmail.com>
+  - Mikko Perttunen <mperttunen@nvidia.com>
+
+properties:
+  $nodename:
+    pattern: "^nvdec@[0-9a-f]*$"
+
+  compatible:
+    enum:
+      - nvidia,tegra234-nvdec
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 3
+
+  clock-names:
+    items:
+      - const: nvdec
+      - const: fuse
+      - const: tsec_pka
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    items:
+      - const: nvdec
+
+  power-domains:
+    maxItems: 1
+
+  iommus:
+    maxItems: 1
+
+  dma-coherent: true
+
+  interconnects:
+    items:
+      - description: DMA read memory client
+      - description: DMA write memory client
+
+  interconnect-names:
+    items:
+      - const: dma-mem
+      - const: write
+
+  nvidia,memory-controller:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      phandle to the memory controller for determining information for the NVDEC
+      firmware secure carveout. This carveout is configured by the bootloader and
+      not accessible to CPU.
+
+  nvidia,bl-manifest-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Offset to bootloader manifest from beginning of firmware that was configured by
+      the bootloader.
+
+  nvidia,bl-code-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Offset to bootloader code section from beginning of firmware that was configured by
+      the bootloader.
+
+  nvidia,bl-data-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Offset to bootloader data section from beginning of firmware that was configured by
+      the bootloader.
+
+  nvidia,os-manifest-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Offset to operating system manifest from beginning of firmware that was configured by
+      the bootloader.
+
+  nvidia,os-code-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Offset to operating system code section from beginning of firmware that was configured by
+      the bootloader.
+
+  nvidia,os-data-offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Offset to operating system data section from beginning of firmware that was configured
+      by the bootloader.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - power-domains
+  - nvidia,memory-controller
+  - nvidia,bl-manifest-offset
+  - nvidia,bl-code-offset
+  - nvidia,bl-data-offset
+  - nvidia,os-manifest-offset
+  - nvidia,os-code-offset
+  - nvidia,os-data-offset
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/tegra234-clock.h>
+    #include <dt-bindings/memory/tegra234-mc.h>
+    #include <dt-bindings/power/tegra234-powergate.h>
+    #include <dt-bindings/reset/tegra234-reset.h>
+
+    nvdec@15480000 {
+            compatible = "nvidia,tegra234-nvdec";
+            reg = <0x15480000 0x00040000>;
+            clocks = <&bpmp TEGRA234_CLK_NVDEC>,
+                     <&bpmp TEGRA234_CLK_FUSE>,
+                     <&bpmp TEGRA234_CLK_TSEC_PKA>;
+            clock-names = "nvdec", "fuse", "tsec_pka";
+            resets = <&bpmp TEGRA234_RESET_NVDEC>;
+            reset-names = "nvdec";
+            power-domains = <&bpmp TEGRA234_POWER_DOMAIN_NVDEC>;
+            interconnects = <&mc TEGRA234_MEMORY_CLIENT_NVDECSRD &emc>,
+                            <&mc TEGRA234_MEMORY_CLIENT_NVDECSWR &emc>;
+            interconnect-names = "dma-mem", "write";
+            iommus = <&smmu_niso1 TEGRA234_SID_NVDEC>;
+            dma-coherent;
+
+            nvidia,memory-controller = <&mc>;
+
+            /* Placeholder values, to be replaced with values from overlay */
+            nvidia,bl-manifest-offset = <0>;
+            nvidia,bl-data-offset = <0>;
+            nvidia,bl-code-offset = <0>;
+            nvidia,os-manifest-offset = <0>;
+            nvidia,os-data-offset = <0>;
+            nvidia,os-code-offset = <0>;
+    };
-- 
2.37.0