81 lines
2.9 KiB
YAML
81 lines
2.9 KiB
YAML
# Copyright (c) 2018 Peter Bigot Consulting, LLC
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# Copyright (c) 2019 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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# Common properties used by nodes describing M25P80-compatible SPI NOR
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# serial flash devices, regardless of which Zephyr driver is being used.
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#
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# This extends JESD216-defined features with additional functionality
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# that may be specific to the vendor of a M25P80-compatible device and
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# only supported in certain drivers. Any information that can be
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# obtained from standardized SFDP parameter blocks should be in
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# jedec,jesd216.yaml instead.
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include: "jedec,jesd216.yaml"
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properties:
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requires-ulbpr:
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type: boolean
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required: false
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description: |
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Indicates the device requires the ULBPR (0x98) command.
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Some flash chips such as the Microchip SST26VF series have a block
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protection register that initializes to write-protected. Use this
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property to indicate that the BPR must be unlocked before write
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operations can proceed.
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has-dpd:
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type: boolean
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required: false
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description: |
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Indicates the device supports the DPD (0xB9) command.
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Use this property to indicate the flash chip supports the Deep
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Power-Down mode that is entered by command 0xB9 to reduce power
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consumption below normal standby levels. Use of this property
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implies that the RDPD (0xAB) Release from Deep Power Down command
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is also supported. (On some chips this command functions as Read
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Electronic Signature; see t-enter-dpd).
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dpd-wakeup-sequence:
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type: array
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required: false
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description: |
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Specifies wakeup durations for devices without RDPD.
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Some devices (Macronix MX25R in particular) wake from deep power
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down by a timed sequence of CSn toggles rather than the RDPD
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command. This property specifies three durations measured in
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nanoseconds, in this order:
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(1) tDPDD (Delay Time for Release from Deep Power-Down Mode)
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(2) tCDRP (CSn Toggling Time before Release from Deep Power-Down Mode)
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(3) tRDP (Recovery Time for Release from Deep Power-Down Mode)
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Absence of this property indicates that the RDPD command should be
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used to wake the chip from Deep Power-Down mode.
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t-enter-dpd:
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type: int
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required: false
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description: |
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Duration required to complete the DPD command.
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This provides the duration, in nanoseconds, that CSn must be
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remain deasserted after issuing DPD before the chip will enter
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deep power down.
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If not provided the driver does not enforce a delay.
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t-exit-dpd:
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type: int
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required: false
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description: |
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Duration required to complete the RDPD command.
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This provides the duration, in nanoseconds, that CSn must be
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remain deasserted after issuing RDPD before the chip will exit
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deep power down and be ready to receive additional commands.
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If not provided the driver does not enforce a delay.
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