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This binding is meant for the child nodes of the TI GPMC node. The node represents any device connected to the GPMC bus. It may be a Flash chip, RAM chip or Ethernet controller, etc. These properties are meant for configuring the GPMC settings/timings and will accompany the bindings supported by the respective device. Signed-off-by: Roger Quadros <rogerq@kernel.org> Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
245 lines
6.2 KiB
YAML
245 lines
6.2 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/memory-controllers/ti,gpmc-child.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: device tree bindings for children of the Texas Instruments GPMC
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maintainers:
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- Tony Lindgren <tony@atomide.com>
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- Roger Quadros <rogerq@kernel.org>
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description:
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This binding is meant for the child nodes of the GPMC node. The node
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represents any device connected to the GPMC bus. It may be a Flash chip,
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RAM chip or Ethernet controller, etc. These properties are meant for
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configuring the GPMC settings/timings and will accompany the bindings
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supported by the respective device.
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properties:
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reg: true
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# GPMC Timing properties for child nodes. All are optional and default to 0.
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gpmc,sync-clk-ps:
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description: Minimum clock period for synchronous mode
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default: 0
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# Chip-select signal timings corresponding to GPMC_CONFIG2:
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gpmc,cs-on-ns:
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description: Assertion time
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default: 0
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gpmc,cs-rd-off-ns:
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description: Read deassertion time
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default: 0
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gpmc,cs-wr-off-ns:
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description: Write deassertion time
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default: 0
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# ADV signal timings corresponding to GPMC_CONFIG3:
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gpmc,adv-on-ns:
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description: Assertion time
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default: 0
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gpmc,adv-rd-off-ns:
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description: Read deassertion time
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default: 0
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gpmc,adv-wr-off-ns:
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description: Write deassertion time
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default: 0
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gpmc,adv-aad-mux-on-ns:
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description: Assertion time for AAD
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default: 0
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gpmc,adv-aad-mux-rd-off-ns:
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description: Read deassertion time for AAD
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default: 0
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gpmc,adv-aad-mux-wr-off-ns:
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description: Write deassertion time for AAD
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default: 0
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# WE signals timings corresponding to GPMC_CONFIG4:
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gpmc,we-on-ns:
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description: Assertion time
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default: 0
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gpmc,we-off-ns:
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description: Deassertion time
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default: 0
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# OE signals timings corresponding to GPMC_CONFIG4:
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gpmc,oe-on-ns:
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description: Assertion time
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default: 0
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gpmc,oe-off-ns:
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description: Deassertion time
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default: 0
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gpmc,oe-aad-mux-on-ns:
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description: Assertion time for AAD
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default: 0
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gpmc,oe-aad-mux-off-ns:
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description: Deassertion time for AAD
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default: 0
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# Access time and cycle time timings (in nanoseconds) corresponding to
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# GPMC_CONFIG5:
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gpmc,page-burst-access-ns:
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description: Multiple access word delay
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default: 0
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gpmc,access-ns:
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description: Start-cycle to first data valid delay
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default: 0
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gpmc,rd-cycle-ns:
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description: Total read cycle time
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default: 0
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gpmc,wr-cycle-ns:
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description: Total write cycle time
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default: 0
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gpmc,bus-turnaround-ns:
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description: Turn-around time between successive accesses
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default: 0
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gpmc,cycle2cycle-delay-ns:
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description: Delay between chip-select pulses
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default: 0
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gpmc,clk-activation-ns:
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description: GPMC clock activation time
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default: 0
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gpmc,wait-monitoring-ns:
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description: Start of wait monitoring with regard to valid data
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default: 0
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# Boolean timing parameters. If property is present, parameter is enabled
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# otherwise disabled.
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gpmc,adv-extra-delay:
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description: ADV signal is delayed by half GPMC clock
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type: boolean
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gpmc,cs-extra-delay:
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description: CS signal is delayed by half GPMC clock
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type: boolean
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gpmc,cycle2cycle-diffcsen:
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description: |
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Add "cycle2cycle-delay" between successive accesses
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to a different CS
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type: boolean
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gpmc,cycle2cycle-samecsen:
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description: |
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Add "cycle2cycle-delay" between successive accesses
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to the same CS
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type: boolean
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gpmc,oe-extra-delay:
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description: OE signal is delayed by half GPMC clock
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type: boolean
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gpmc,we-extra-delay:
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description: WE signal is delayed by half GPMC clock
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type: boolean
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gpmc,time-para-granularity:
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description: Multiply all access times by 2
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type: boolean
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# The following two properties are applicable only to OMAP3+ and AM335x:
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gpmc,wr-access-ns:
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description: |
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In synchronous write mode, for single or
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burst accesses, defines the number of
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GPMC_FCLK cycles from start access time
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to the GPMC_CLK rising edge used by the
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memory device for the first data capture.
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default: 0
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gpmc,wr-data-mux-bus-ns:
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description: |
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In address-data multiplex mode, specifies
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the time when the first data is driven on
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the address-data bus.
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default: 0
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# GPMC chip-select settings properties for child nodes. All are optional.
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gpmc,burst-length:
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description: Page/burst length.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 4, 8, 16]
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default: 0
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gpmc,burst-wrap:
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description: Enables wrap bursting
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type: boolean
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gpmc,burst-read:
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description: Enables read page/burst mode
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type: boolean
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gpmc,burst-write:
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description: Enables write page/burst mode
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type: boolean
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gpmc,device-width:
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description: |
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Total width of device(s) connected to a GPMC
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chip-select in bytes. The GPMC supports 8-bit
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and 16-bit devices and so this property must be
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1 or 2.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [1, 2]
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default: 1
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gpmc,mux-add-data:
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description: |
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Address and data multiplexing configuration.
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Valid values are
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0 for Non multiplexed mode
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1 for address-address-data multiplexing mode and
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2 for address-data multiplexing mode.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1, 2]
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gpmc,sync-read:
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description: |
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Enables synchronous read. Defaults to asynchronous
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is this is not set.
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type: boolean
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gpmc,sync-write:
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description: |
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Enables synchronous writes. Defaults to asynchronous
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is this is not set.
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type: boolean
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gpmc,wait-pin:
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description: |
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Wait-pin used by client. Must be less than "gpmc,num-waitpins".
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$ref: /schemas/types.yaml#/definitions/uint32
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gpmc,wait-on-read:
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description: Enables wait monitoring on reads.
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type: boolean
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gpmc,wait-on-write:
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description: Enables wait monitoring on writes.
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type: boolean
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required:
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- reg
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# the GPMC child will have its own native properties
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additionalProperties: true
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