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Subject[PATCH V2 01/10] Documentation: dt-bindings: mailbox: tegra: Add binding for HSP mailbox
Date
Add DT binding for the Hardware Synchronization Primitives (HSP). The
HSP is designed for the processors to share resources and communicate
together. It provides a set of hardware synchronization primitives for
interprocessor communication. So the interprocessor communication (IPC)
protocols can use hardware synchronization primitive, when operating
between two processors not in an SMP relationship.

Signed-off-by: Joseph Lo <josephl@nvidia.com>
---
Changes in V2:
- revise the compatible string, interrupt-names, interrupts, and #mbox-cells
properties
- remove "nvidia,hsp-function" property
- fix the header file name
- the binding supports the concept of multiple HSP sub-modules on one HSP HW
block now.
---
.../bindings/mailbox/nvidia,tegra186-hsp.txt | 51 ++++++++++++++++++++++
include/dt-bindings/mailbox/tegra186-hsp.h | 23 ++++++++++
2 files changed, 74 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt
create mode 100644 include/dt-bindings/mailbox/tegra186-hsp.h

diff --git a/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt
new file mode 100644
index 000000000000..10e53edbe1c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt
@@ -0,0 +1,51 @@
+NVIDIA Tegra Hardware Synchronization Primitives (HSP)
+
+The HSP modules are used for the processors to share resources and communicate
+together. It provides a set of hardware synchronization primitives for
+interprocessor communication. So the interprocessor communication (IPC)
+protocols can use hardware synchronization primitives, when operating between
+two processors not in an SMP relationship.
+
+The features that HSP supported are shared mailboxes, shared semaphores,
+arbitrated semaphores and doorbells.
+
+Required properties:
+- name : Should be hsp
+- compatible
+ Array of strings.
+ one of:
+ - "nvidia,tegra186-hsp"
+- reg : Offset and length of the register set for the device.
+- interrupt-names
+ Array of strings.
+ Contains a list of names for the interrupts described by the interrupt
+ property. May contain the following entries, in any order:
+ - "doorbell"
+ Users of this binding MUST look up entries in the interrupt property
+ by name, using this interrupt-names property to do so.
+- interrupts
+ Array of interrupt specifiers.
+ Must contain one entry per entry in the interrupt-names property,
+ in a matching order.
+- #mbox-cells : Should be 1.
+
+The mbox specifier of the "mboxes" property in the client node should use
+the "HSP_MBOX_ID" macro which integrates the HSP type and master ID data.
+Those information can be found in the following file.
+
+- <dt-bindings/mailbox/tegra186-hsp.h>.
+
+Example:
+
+hsp_top0: hsp@3c00000 {
+ compatible = "nvidia,tegra186-hsp";
+ reg = <0x0 0x03c00000 0x0 0xa0000>;
+ interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "doorbell";
+ #mbox-cells = <1>;
+};
+
+client {
+ ...
+ mboxes = <&hsp_top0 HSP_MBOX_ID(DB, HSP_DB_MASTER_XXX)>;
+};
diff --git a/include/dt-bindings/mailbox/tegra186-hsp.h b/include/dt-bindings/mailbox/tegra186-hsp.h
new file mode 100644
index 000000000000..365dbeb5d894
--- /dev/null
+++ b/include/dt-bindings/mailbox/tegra186-hsp.h
@@ -0,0 +1,23 @@
+/*
+ * This header provides constants for binding nvidia,tegra186-hsp.
+ *
+ * The number with HSP_DB_MASTER prefix indicates the bit that is
+ * associated with a master ID in the doorbell registers.
+ */
+
+
+#ifndef _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H
+#define _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H
+
+#define HSP_MBOX_TYPE_DB 0x0
+#define HSP_MBOX_TYPE_SM 0x1
+#define HSP_MBOX_TYPE_SS 0x2
+#define HSP_MBOX_TYPE_AS 0x3
+
+#define HSP_DB_MASTER_CCPLEX 17
+#define HSP_DB_MASTER_BPMP 19
+
+#define HSP_MBOX_ID(type, ID) \
+ (HSP_MBOX_TYPE_##type << 16 | ID)
+
+#endif /* _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H */
--
2.9.0
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