Date:   Tue, 27 Sep 2022 10:55:57 +0800
From:   Tinghan Shen <tinghan.shen@...iatek.com>
To:     Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>
CC:     <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>
Subject: [PATCH v3 02/11] dt-bindings: remoteproc: mediatek: Support MT8195 dual-core SCP

The MT8195 SCP is a dual-core RISC-V MCU. Extend the yaml file
to describe the 2nd core as a subnode of the boot core.

The configuration register is shared by MT8195 SCP core 0
and core 1. The core 1 can retrieve the information of configuration
registers from parent node.

Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
---
 .../bindings/remoteproc/mtk,scp.yaml          | 97 ++++++++++++++++++-
 1 file changed, 92 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
index 786bed897916..c012265be4eb 100644
--- a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
@@ -75,6 +75,83 @@ properties:
     required:
       - mediatek,rpmsg-name
 
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 1
+
+  ranges: true
+
+patternProperties:
+  "^scp-c[0-9]+@[a-f0-9]+$":
+    type: object
+    description:
+      The MediaTek SCP integrated to SoC might be a multi-core version.
+      The other cores are represented as child nodes of the boot core.
+      There are some integration differences for the IP like the usage of
+      address translator for translating SoC bus addresses into address space
+      for the processor.
+
+      Each SCP core has own cache memory. The SRAM and L1TCM are shared by
+      cores. The power of cache, SRAM and L1TCM power should be enabled
+      before booting SCP cores. The size of cache, SRAM, and L1TCM are varied
+      on differnt SoCs.
+
+      The SCP cores do not use an MMU, but has a set of registers to
+      control the translations between 32-bit CPU addresses into system bus
+      addresses. Cache and memory access settings are provided through a
+      Memory Protection Unit (MPU), programmable only from the SCP.
+
+    properties:
+      compatible:
+        enum:
+          - mediatek,mt8195-scp-core
+
+      reg:
+        description: The base address and size of SRAM.
+        maxItems: 1
+
+      reg-names:
+        const: sram
+
+      interrupts:
+        maxItems: 1
+
+      firmware-name:
+        $ref: /schemas/types.yaml#/definitions/string
+        description:
+          If present, name (or relative path) of the file within the
+          firmware search path containing the firmware image used when
+          initializing sub cores of multi-core SCP.
+
+      memory-region:
+        maxItems: 1
+
+      cros-ec-rpmsg:
+        type: object
+        description:
+          This subnode represents the rpmsg device. The namesof the devices
+          are not important. The properties of this node are defined by the
+          individual bindings for the rpmsg devices.
+
+        properties:
+          mediatek,rpmsg-name:
+            $ref: /schemas/types.yaml#/definitions/string-array
+            description:
+              Contains the name for the rpmsg device. Used to match
+              the subnode to rpmsg device announced by SCP.
+
+        required:
+          - mediatek,rpmsg-name
+
+    required:
+      - compatible
+      - reg
+      - reg-names
+
+    additionalProperties: false
+
 required:
   - compatible
   - reg
@@ -110,16 +187,26 @@ additionalProperties: false
 
 examples:
   - |
-    #include <dt-bindings/clock/mt8192-clk.h>
-
     scp@...00000 {
-        compatible = "mediatek,mt8192-scp";
+        compatible = "mediatek,mt8195-scp";
         reg = <0x10500000 0x80000>,
               <0x10700000 0x8000>,
               <0x10720000 0xe0000>;
         reg-names = "sram", "cfg", "l1tcm";
-        clocks = <&infracfg CLK_INFRA_SCPSYS>;
-        clock-names = "main";
+
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x105a0000 0x105a0000 0x20000>;
+
+        scp-c1@...a0000 {
+                compatible = "mediatek,mt8195-scp-core";
+                reg = <0x105a0000 0x20000>;
+                reg-names = "sram";
+
+                cros-ec-rpmsg {
+                    mediatek,rpmsg-name = "cros-ec-rpmsg";
+                };
+        };
 
         cros-ec-rpmsg {
             mediatek,rpmsg-name = "cros-ec-rpmsg";
-- 
2.18.0

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