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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2024 Linaro Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/google,gs101-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos Mailbox Controller
+
+maintainers:
+ - Tudor Ambarus <tudor.ambarus@linaro.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-mbox
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ clock-names:
+ items:
+ - const: pclk
+
+ interrupts:
+ description: IRQ line for the RX mailbox.
+ maxItems: 1
+
+ '#mbox-cells':
+ description: |
+ <&phandle type channel>
+ phandle : label name of controller.
+ type : channel type, doorbell or data-transfer.
+ channel : channel number.
+
+ Here is how a client can reference them:
+ mboxes = <&ap2apm_mailbox DOORBELL 2>;
+ mboxes = <&ap2apm_mailbox DATA 3>;
+ const: 2
+
+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@17610000 {
+ compatible = "google,gs101-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 = <2>;
+ };
+ };
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+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright 2024 Linaro Ltd.
+ *
+ * This header provides constants for the defined mailbox channel types.
+ */
+
+#ifndef _DT_BINDINGS_MAILBOX_GOOGLE_GS101_H
+#define _DT_BINDINGS_MAILBOX_GOOGLE_GS101_H
+
+#define DOORBELL 0
+#define DATA 1
+
+#endif /* _DT_BINDINGS_MAILBOX_GOOGLE_GS101_H */
Add bindings for the Samsung Exynos Mailbox Controller. Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org> --- .../bindings/mailbox/google,gs101-mbox.yaml | 79 ++++++++++++++++++++++ include/dt-bindings/mailbox/google,gs101.h | 14 ++++ 2 files changed, 93 insertions(+)