eeebb4d911
Currently, all devices are initialized at boot time (following their level and priority order). This patch introduces deferred initialization: by setting the property `zephyr,deferred-init` on a device on the devicetree, Zephyr will not initialized the device. To initialize such devices, one has to call `device_init()`. Deferred initialization is done by grouping all deferred devices on a different ELF section. In this way, there's no need to consume more memory to keep track of deferred devices. When `device_init()` is called, Zephyr will scan the deferred devices section and call the initialization function for the matching device. As this scanning is done only during deferred device initialization, its cost should be bearable. Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>
101 lines
2.2 KiB
YAML
101 lines
2.2 KiB
YAML
# Common fields for all devices
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include: [pm.yaml]
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properties:
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status:
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type: string
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description: indicates the operational status of a device
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enum:
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- "ok" # Deprecated form
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- "okay"
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- "disabled"
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- "reserved"
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- "fail"
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- "fail-sss"
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compatible:
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type: string-array
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required: true
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description: compatible strings
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reg:
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type: array
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description: register space
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reg-names:
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type: string-array
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description: name of each register space
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interrupts:
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type: array
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description: interrupts for device
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# Does not follow the 'type: phandle-array' scheme, but gets type-checked
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# by the code. Declare it here just so that other bindings can make it
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# 'required: true' easily if they want to.
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interrupts-extended:
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type: compound
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description: extended interrupt specifier for device
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interrupt-names:
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type: string-array
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description: name of each interrupt
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interrupt-parent:
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type: phandle
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description: phandle to interrupt controller node
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label:
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type: string
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deprecated: true
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description: |
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Human readable string describing the device (used as device_get_binding() argument)
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clocks:
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type: phandle-array
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description: Clock gate information
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clock-names:
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type: string-array
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description: name of each clock
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"#address-cells":
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type: int
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description: number of address cells in reg property
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"#size-cells":
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type: int
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description: number of size cells in reg property
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dmas:
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type: phandle-array
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description: DMA channels specifiers
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dma-names:
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type: string-array
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description: Provided names of DMA channel specifiers
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io-channels:
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type: phandle-array
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description: IO channels specifiers
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io-channel-names:
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type: string-array
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description: Provided names of IO channel specifiers
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mboxes:
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type: phandle-array
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description: mailbox / IPM channels specifiers
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specifier-space: mbox
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mbox-names:
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type: string-array
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description: Provided names of mailbox / IPM channel specifiers
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zephyr,deferred-init:
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type: boolean
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description: |
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Do not initialize device automatically on boot. Device should be manually
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initialized using device_init().
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