linux-kernel - [PATCH v3 1/3] dt-bindings: mailbox: add bindings for samsung,exynos

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Message-ID: <20241205174137.190545-2-tudor.ambarus@linaro.org>
Date: Thu,  5 Dec 2024 17:41:35 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: jassisinghbrar@...il.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	alim.akhtar@...sung.com
Cc: linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	andre.draszik@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	peter.griffin@...aro.org,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v3 1/3] dt-bindings: mailbox: add bindings for samsung,exynos

Add bindings for the Samsung Exynos Mailbox Controller.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 .../bindings/mailbox/samsung,exynos.yaml      | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/samsung,exynos.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/samsung,exynos.yaml b/Documentation/devicetree/bindings/mailbox/samsung,exynos.yaml
new file mode 100644
index 000000000000..1fddec1fc64c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/samsung,exynos.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2024 Linaro Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/samsung,exynos.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos Mailbox Controller
+
+maintainers:
+  - Tudor Ambarus <tudor.ambarus@...aro.org>
+
+description: |
+  The samsung exynos mailbox controller has 16 flag bits for hardware interrupt
+  generation and a shared register for passing mailbox messages. When the
+  controller is used by the ACPM protocol the shared register is ignored and
+  the mailbox controller acts as a doorbell. The controller just raises the
+  interrupt to the firmware after the ACPM protocol has written the message to
+  SRAM.
+
+properties:
+  compatible:
+    const: google,gs101-acpm-mbox
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: pclk
+
+  interrupts:
+    description: IRQ line for the RX mailbox.
+    maxItems: 1
+
+  '#mbox-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - '#mbox-cells'
+
+additionalProperties: false
+
+examples:
+  # Doorbell mode.
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/google,gs101.h>
+
+    soc {
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        ap2apm_mailbox: mailbox@...10000 {
+            compatible = "google,gs101-acpm-mbox";
+            reg = <0x17610000 0x1000>;
+            clocks = <&cmu_apm CLK_GOUT_APM_MAILBOX_APM_AP_PCLK>;
+            clock-names = "pclk";
+            interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH 0>;
+            #mbox-cells = <1>;
+        };
+    };
-- 
2.47.0.338.g60cca15819-goog