diff options
Diffstat (limited to 'Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.txt')
-rw-r--r-- | Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.txt | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.txt b/Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.txt new file mode 100644 index 000000000000..7c7edaf1cd62 --- /dev/null +++ b/Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.txt @@ -0,0 +1,81 @@ +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: +- name : Should be bpmp +- 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. +- #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 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> +- .../reset/reset.txt +- <dt-bindings/reset/tegra186-reset.h> + +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@03c00000 { + ... + #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>; + #reset-cells = <1>; +}; |