linux-kernel - [PATCH v5 3/4] dt-bindings: irqchip: imx mu work as msi controller

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Date:   Mon, 15 Aug 2022 16:39:35 -0500
From:   Frank Li <Frank.Li@....com>
To:     maz@...nel.org, tglx@...utronix.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kw@...ux.com, bhelgaas@...gle.com
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        peng.fan@....com, aisheng.dong@....com, jdmason@...zu.us,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        kishon@...com, lorenzo.pieralisi@....com, ntb@...ts.linux.dev,
        lznuaa@...il.com
Subject: [PATCH v5 3/4] dt-bindings: irqchip: imx mu work as msi controller

I.MX mu support generate irq by write a register. Provide msi controller
support so other driver such as PCI EP can use it by standard msi
interface as doorbell.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 .../interrupt-controller/fsl,mu-msi.yaml      | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml b/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml
new file mode 100644
index 0000000000000..ac07b138e24c0
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-msi.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/fsl,mu-msi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale/NXP i.MX Messaging Unit (MU) work as msi controller
+
+maintainers:
+  - Frank Li <Frank.Li@....com>
+
+description: |
+  The Messaging Unit module enables two processors within the SoC to
+  communicate and coordinate by passing messages (e.g. data, status
+  and control) through the MU interface. The MU also provides the ability
+  for one processor (A side) to signal the other processor (B side) using
+  interrupts.
+
+  Because the MU manages the messaging between processors, the MU uses
+  different clocks (from each side of the different peripheral buses).
+  Therefore, the MU must synchronize the accesses from one side to the
+  other. The MU accomplishes synchronization using two sets of matching
+  registers (Processor A-facing, Processor B-facing).
+
+  MU can work as msi interrupt controller to do doorbell
+
+allOf:
+  - $ref: /schemas/interrupt-controller/msi-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx6sx-mu-msi
+      - fsl,imx7ulp-mu-msi
+      - fsl,imx8ulp-mu-msi
+      - fsl,imx8ulp-mu-msi-s4
+
+  reg:
+    items:
+      - description: a side register base address
+      - description: b side register base address
+
+  reg-names:
+    items:
+      - const: processor a-facing
+      - const: processor b-facing
+
+  interrupts:
+    description: a side interrupt number.
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    items:
+      - description: a side power domain
+      - description: b side power domain
+
+  power-domain-names:
+    items:
+      - const: processor a-facing
+      - const: processor b-facing
+
+  interrupt-controller: true
+
+  msi-controller: true
+
+  "#msi-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+  - msi-controller
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/firmware/imx/rsrc.h>
+
+    msi-controller@...70000 {
+        compatible = "fsl,imx6sx-mu-msi";
+        msi-controller;
+        #msi-cells = <0>;
+        interrupt-controller;
+        reg = <0x5d270000 0x10000>,     /* A side */
+              <0x5d300000 0x10000>;     /* B side */
+        reg-names = "processor a-facing", "processor b-facing";
+        interrupts = <GIC_SPI 191 IRQ_TYPE_LEVEL_HIGH>;
+        power-domains = <&pd IMX_SC_R_MU_12A>,
+                        <&pd IMX_SC_R_MU_12B>;
+        power-domain-names = "processor a-facing", "processor b-facing";
+    };
-- 
2.35.1