98 lines
2.9 KiB
YAML
98 lines
2.9 KiB
YAML
# Copyright (c) 2020 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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description: Atmel AT45 (or compatible) SPI flash
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compatible: "atmel,at45"
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include: [spi-device.yaml]
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properties:
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jedec-id:
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type: uint8-array
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required: true
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description: JEDEC ID as manufacturer ID (1 byte) and device ID (2 bytes).
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size:
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type: int
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required: true
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description: Flash capacity in bits.
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sector-size:
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type: int
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required: true
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description: Flash sector size in bytes.
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sector-0a-pages:
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type: int
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default: 8
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description: |
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Most available AT45 flash chips have their first two sectors shorter
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than the consecutive ones. Usually, the first sector is marked as 0a
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and has its size equal to eight pages (one block) and the second one
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(usually 0b) is the complement to the size of a regular sector.
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This property allows specifying the size (in pages) of that first sector
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and defaults to the commonly used value of eight pages.
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Value of zero means that the flash chip has all sectors of equal size.
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block-size:
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type: int
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required: true
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description: Flash block size in bytes.
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page-size:
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type: int
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required: true
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description: Flash page size in bytes.
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no-chip-erase:
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type: boolean
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description: |
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If set, indicates that the chip does not support the chip erase command.
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no-sector-erase:
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type: boolean
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description: |
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If set, indicates that the chip does not support the sector erase command.
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use-udpd:
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type: boolean
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description: |
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When set, the driver will use the Ultra-Deep Power-Down command instead
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of the default Deep Power-Down one to put the chip into low power mode.
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From the driver perspective, as it does not rely on the contents of the
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SRAM buffers in the chip, the difference between the Deep and Ultra-Deep
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Power-Down modes is that the chip consumes far less power in the latter
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but needs some more time to enter this mode and to exit from it.
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enter-dpd-delay:
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type: int
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default: 0
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description: |
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Time, in nanoseconds, needed by the chip to enter the Deep Power-Down
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mode (or Ultra-Deep Power-Down mode when the "use-udpd" property is set)
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after the corresponding command is issued.
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exit-dpd-delay:
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type: int
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default: 0
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description: |
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Time, in nanoseconds, needed by the chip to exit from the Deep Power-Down
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mode (or Ultra-Deep Power-Down mode when the "use-udpd" property is set)
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after the corresponding command is issued.
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reset-gpios:
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type: phandle-array
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description: |
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The RESET pin of AT45 is active low.
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If connected directly the MCU pin should be configured
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as active low.
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wp-gpios:
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type: phandle-array
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description: |
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The WP pin of AT45 is active low.
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If connected directly the MCU pin should be configured
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as active low.
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