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-NVIDIA Tegra Boot and Power Management Processor (BPMP)
-
-The BPMP is a specific processor in Tegra chip, which is designed for
-booting process handling and offloading the power management, clock
-management, and reset control tasks from the CPU. The binding document
-defines the resources that would be used by the BPMP firmware driver,
-which can create the interprocessor communication (IPC) between the CPU
-and BPMP.
-
-Required properties:
-- compatible
- Array of strings
- One of:
- - "nvidia,tegra186-bpmp"
-- mboxes : The phandle of mailbox controller and the mailbox specifier.
-- shmem : List of the phandle of the TX and RX shared memory area that
- the IPC between CPU and BPMP is based on.
-- #clock-cells : Should be 1.
-- #power-domain-cells : Should be 1.
-- #reset-cells : Should be 1.
-
-This node is a mailbox consumer. See the following files for details of
-the mailbox subsystem, and the specifiers implemented by the relevant
-provider(s):
-
-- .../mailbox/mailbox.txt
-- .../mailbox/nvidia,tegra186-hsp.txt
-
-This node is a clock, power domain, and reset provider. See the following
-files for general documentation of those features, and the specifiers
-implemented by this node:
-
-- .../clock/clock-bindings.txt
-- <dt-bindings/clock/tegra186-clock.h>
-- ../power/power-domain.yaml
-- <dt-bindings/power/tegra186-powergate.h>
-- .../reset/reset.txt
-- <dt-bindings/reset/tegra186-reset.h>
-
-The BPMP implements some services which must be represented by separate nodes.
-For example, it can provide access to certain I2C controllers, and the I2C
-bindings represent each I2C controller as a device tree node. Such nodes should
-be nested directly inside the main BPMP node.
-
-Software can determine whether a child node of the BPMP node represents a device
-by checking for a compatible property. Any node with a compatible property
-represents a device that can be instantiated. Nodes without a compatible
-property may be used to provide configuration information regarding the BPMP
-itself, although no such configuration nodes are currently defined by this
-binding.
-
-The BPMP firmware defines no single global name-/numbering-space for such
-services. Put another way, the numbering scheme for I2C buses is distinct from
-the numbering scheme for any other service the BPMP may provide (e.g. a future
-hypothetical SPI bus service). As such, child device nodes will have no reg
-property, and the BPMP node will have no #address-cells or #size-cells property.
-
-The shared memory bindings for BPMP
------------------------------------
-
-The shared memory area for the IPC TX and RX between CPU and BPMP are
-predefined and work on top of sysram, which is an SRAM inside the chip.
-
-See ".../sram/sram.txt" for the bindings.
-
-Example:
-
-hsp_top0: hsp@3c00000 {
- ...
- #mbox-cells = <2>;
-};
-
-sysram@30000000 {
- compatible = "nvidia,tegra186-sysram", "mmio-sram";
- reg = <0x0 0x30000000 0x0 0x50000>;
- #address-cells = <2>;
- #size-cells = <2>;
- ranges = <0 0x0 0x0 0x30000000 0x0 0x50000>;
-
- cpu_bpmp_tx: shmem@4e000 {
- compatible = "nvidia,tegra186-bpmp-shmem";
- reg = <0x0 0x4e000 0x0 0x1000>;
- label = "cpu-bpmp-tx";
- pool;
- };
-
- cpu_bpmp_rx: shmem@4f000 {
- compatible = "nvidia,tegra186-bpmp-shmem";
- reg = <0x0 0x4f000 0x0 0x1000>;
- label = "cpu-bpmp-rx";
- pool;
- };
-};
-
-bpmp {
- compatible = "nvidia,tegra186-bpmp";
- mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_DB TEGRA_HSP_DB_MASTER_BPMP>;
- shmem = <&cpu_bpmp_tx &cpu_bpmp_rx>;
- #clock-cells = <1>;
- #power-domain-cells = <1>;
- #reset-cells = <1>;
-
- i2c {
- compatible = "...";
- ...
- };
-};