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