Add bindings for the Samsung Exynos Mailbox Controller. Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx> --- .../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@xxxxxxxxxx> + +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@17610000 { + 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
