linux-kernel - [PATCH v7 3/4] dt-bindings: firmware: Add bindings for xilinx firmware

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Message-ID: <20210604113332.1394-4-nava.manne@xilinx.com>
Date:   Fri, 4 Jun 2021 17:03:31 +0530
From:   Nava kishore Manne <nava.manne@...inx.com>
To:     <robh+dt@...nel.org>, <michal.simek@...inx.com>, <mdf@...nel.org>,
        <trix@...hat.com>, <nava.manne@...inx.com>, <arnd@...db.de>,
        <rajan.vaja@...inx.com>, <gregkh@...uxfoundation.org>,
        <amit.sunil.dhamne@...inx.com>, <tejas.patel@...inx.com>,
        <zou_wei@...wei.com>, <lakshmi.sai.krishna.potthuri@...inx.com>,
        <ravi.patel@...inx.com>, <iwamatsu@...auri.org>,
        <wendy.liang@...inx.com>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-fpga@...r.kernel.org>,
        <git@...inx.com>, <chinnikishore369@...il.com>
Subject: [PATCH v7 3/4] dt-bindings: firmware: Add bindings for xilinx firmware

Add documentation to describe Xilinx firmware driver bindings.
Firmware driver provides an interface to firmware APIs.
Interface APIs can be used by any driver to communicate
to Platform Management Unit.

Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
---
Changes for v4:
              -Added new yaml file for xilinx firmware
               as suggested by Rob.

Changes for v5:
              -Fixed some minor issues and updated the fpga node name to versal_fpga.

Changes for v6:
              -Added AES and Clk nodes as a sub nodes to the firmware node.

Changes for v7:
              -Fixed child nodes format ssues.

 .../firmware/xilinx/xlnx,zynqmp-firmware.yaml | 94 +++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml

diff --git a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
new file mode 100644
index 000000000000..8e0241c4c137
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
@@ -0,0 +1,94 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/xilinx/xlnx,zynqmp-firmware.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx firmware driver
+
+maintainers:
+  - Nava kishore Manne <nava.manne@...inx.com>
+
+description:
+  The zynqmp-firmware node describes the interface to platform firmware.
+  ZynqMP has an interface to communicate with secure firmware. Firmware
+  driver provides an interface to firmware APIs. Interface APIs can be
+  used by any driver to communicate to PMUFW(Platform Management Unit).
+  These requests include clock management, pin control, device control,
+  power management service, FPGA service and other platform management
+  services.
+
+properties:
+  compatible:
+    oneOf:
+      - description:
+          For implementations complying for Zynq Ultrascale+ MPSoC.
+        const: xlnx,zynqmp-firmware
+
+      - description:
+          For implementations complying for Versal.
+        const: xlnx,versal-firmware
+
+  method:
+    description: |
+                 The method of calling the PM-API firmware layer.
+                 Permitted values are.
+                 - "smc" : SMC #0, following the SMCCC
+                 - "hvc" : HVC #0, following the SMCCC
+
+    $ref: /schemas/types.yaml#/definitions/string-array
+    enum:
+      - smc
+      - hvc
+
+  "versal_fpga":
+    $ref: /schemas/fpga/xlnx,versal-fpga.yaml#
+    description: Compatible of the FPGA device.
+    type: object
+
+  "zynqmp-aes":
+    $ref: /schemas/crypto/xlnx,zynqmp-aes.yaml#
+    description: |
+                 The ZynqMP AES-GCM hardened cryptographic accelerator is
+                 used to encrypt or decrypt the data with provided key and
+                 initialization vector.
+    type: object
+
+  "clock-controller":
+    $ref: /schemas/clock/xlnx,versal-clk.yaml#
+    description: |
+                 The clock controller is a hardware block of Xilinx versal
+                 clock tree. It reads required input clock frequencies from
+                 the devicetree and acts as clock provider for all clock
+                 consumers of PS clocks.list of clock specifiers which are
+                 external input clocks to the given clock controller.
+    type: object
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    versal-firmware {
+      compatible = "xlnx,versal-firmware";
+      method = "smc";
+
+      versal_fpga: versal_fpga {
+        compatible = "xlnx,versal-fpga";
+      };
+
+      xlnx_aes: zynqmp-aes {
+        compatible = "xlnx,zynqmp-aes";
+      };
+
+      versal_clk: clock-controller {
+        #clock-cells = <1>;
+        compatible = "xlnx,versal-clk";
+        clocks = <&ref>, <&alt_ref>, <&pl_alt_ref>;
+        clock-names = "ref", "alt_ref", "pl_alt_ref";
+      };
+    };
+
+...
-- 
2.17.1