53 lines
1.7 KiB
Text
53 lines
1.7 KiB
Text
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TI Wakeup M3 Remoteproc Driver
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==============================
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The TI AM33xx and AM43xx family of devices use a small Cortex M3 co-processor
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(commonly referred to as Wakeup M3 or CM3) to help with various low power tasks
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that cannot be controlled from the MPU. This CM3 processor requires a firmware
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binary to accomplish this. The wkup_m3 remoteproc driver handles the loading of
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the firmware and booting of the CM3.
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Wkup M3 Device Node:
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====================
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A wkup_m3 device node is used to represent the Wakeup M3 processor instance
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within the SoC. It is added as a child node of the parent interconnect bus
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(l4_wkup) through which it is accessible to the MPU.
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Required properties:
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--------------------
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- compatible: Should be one of,
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"ti,am3352-wkup-m3" for AM33xx SoCs
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"ti,am4372-wkup-m3" for AM43xx SoCs
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- reg: Should contain the address ranges for the two internal
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memory regions, UMEM and DMEM. The parent node should
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provide an appropriate ranges property for properly
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translating these into bus addresses.
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- reg-names: Contains the corresponding names for the two memory
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regions. These should be named "umem" & "dmem".
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- ti,hwmods: Name of the hwmod associated with the wkupm3 device.
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- ti,pm-firmware: Name of firmware file to be used for loading and
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booting the wkup_m3 remote processor.
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Example:
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--------
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/* AM33xx */
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ocp {
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l4_wkup: l4_wkup@44c00000 {
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compatible = "am335-l4-wkup", "simple-bus";
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ranges = <0 0x44c00000 0x400000>;
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#address-cells = <1>;
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#size-cells = <1>;
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wkup_m3: wkup_m3@100000 {
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compatible = "ti,am3352-wkup-m3";
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reg = <0x100000 0x4000>,
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<0x180000 0x2000>;
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reg-names = "umem", "dmem";
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ti,hwmods = "wkup_m3";
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ti,pm-firmware = "am335x-pm-firmware.elf";
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};
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};
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...
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};
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