| Jon Hunter | cdd6928 | 2013-02-08 16:46:13 -0600 | [diff] [blame] | 1 | Device tree bindings for NOR flash connect to TI GPMC |
| 2 | |
| 3 | NOR flash connected to the TI GPMC (found on OMAP boards) are represented as |
| 4 | child nodes of the GPMC controller with a name of "nor". |
| 5 | |
| 6 | All timing relevant properties as well as generic GPMC child properties are |
| 7 | explained in a separate documents. Please refer to |
| 8 | Documentation/devicetree/bindings/bus/ti-gpmc.txt |
| 9 | |
| 10 | Required properties: |
| 11 | - bank-width: Width of NOR flash in bytes. GPMC supports 8-bit and |
| 12 | 16-bit devices and so must be either 1 or 2 bytes. |
| 13 | - compatible: Documentation/devicetree/bindings/mtd/mtd-physmap.txt |
| 14 | - gpmc,cs-on-ns: Chip-select assertion time |
| 15 | - gpmc,cs-rd-off-ns: Chip-select de-assertion time for reads |
| 16 | - gpmc,cs-wr-off-ns: Chip-select de-assertion time for writes |
| 17 | - gpmc,oe-on-ns: Output-enable assertion time |
| 18 | - gpmc,oe-off-ns: Output-enable de-assertion time |
| 19 | - gpmc,we-on-ns Write-enable assertion time |
| 20 | - gpmc,we-off-ns: Write-enable de-assertion time |
| 21 | - gpmc,access-ns: Start cycle to first data capture (read access) |
| 22 | - gpmc,rd-cycle-ns: Total read cycle time |
| 23 | - gpmc,wr-cycle-ns: Total write cycle time |
| 24 | - linux,mtd-name: Documentation/devicetree/bindings/mtd/mtd-physmap.txt |
| 25 | - reg: Chip-select, base address (relative to chip-select) |
| 26 | and size of NOR flash. Note that base address will be |
| 27 | typically 0 as this is the start of the chip-select. |
| 28 | |
| 29 | Optional properties: |
| 30 | - gpmc,XXX Additional GPMC timings and settings parameters. See |
| 31 | Documentation/devicetree/bindings/bus/ti-gpmc.txt |
| 32 | |
| Carlos Garcia | c98be0c | 2014-04-04 22:31:00 -0400 | [diff] [blame^] | 33 | Optional properties for partition table parsing: |
| Jon Hunter | cdd6928 | 2013-02-08 16:46:13 -0600 | [diff] [blame] | 34 | - #address-cells: should be set to 1 |
| 35 | - #size-cells: should be set to 1 |
| 36 | |
| 37 | Example: |
| 38 | |
| 39 | gpmc: gpmc@6e000000 { |
| 40 | compatible = "ti,omap3430-gpmc", "simple-bus"; |
| 41 | ti,hwmods = "gpmc"; |
| 42 | reg = <0x6e000000 0x1000>; |
| 43 | interrupts = <20>; |
| 44 | gpmc,num-cs = <8>; |
| 45 | gpmc,num-waitpins = <4>; |
| 46 | #address-cells = <2>; |
| 47 | #size-cells = <1>; |
| 48 | |
| 49 | ranges = <0 0 0x10000000 0x08000000>; |
| 50 | |
| 51 | nor@0,0 { |
| 52 | compatible = "cfi-flash"; |
| 53 | linux,mtd-name= "intel,pf48f6000m0y1be"; |
| 54 | #address-cells = <1>; |
| 55 | #size-cells = <1>; |
| 56 | reg = <0 0 0x08000000>; |
| 57 | bank-width = <2>; |
| 58 | |
| 59 | gpmc,mux-add-data; |
| 60 | gpmc,cs-on-ns = <0>; |
| 61 | gpmc,cs-rd-off-ns = <186>; |
| 62 | gpmc,cs-wr-off-ns = <186>; |
| 63 | gpmc,adv-on-ns = <12>; |
| 64 | gpmc,adv-rd-off-ns = <48>; |
| 65 | gpmc,adv-wr-off-ns = <48>; |
| 66 | gpmc,oe-on-ns = <54>; |
| 67 | gpmc,oe-off-ns = <168>; |
| 68 | gpmc,we-on-ns = <54>; |
| 69 | gpmc,we-off-ns = <168>; |
| 70 | gpmc,rd-cycle-ns = <186>; |
| 71 | gpmc,wr-cycle-ns = <186>; |
| 72 | gpmc,access-ns = <114>; |
| 73 | gpmc,page-burst-access-ns = <6>; |
| 74 | gpmc,bus-turnaround-ns = <12>; |
| 75 | gpmc,cycle2cycle-delay-ns = <18>; |
| 76 | gpmc,wr-data-mux-bus-ns = <90>; |
| 77 | gpmc,wr-access-ns = <186>; |
| 78 | gpmc,cycle2cycle-samecsen; |
| 79 | gpmc,cycle2cycle-diffcsen; |
| 80 | |
| 81 | partition@0 { |
| 82 | label = "bootloader-nor"; |
| 83 | reg = <0 0x40000>; |
| 84 | }; |
| 85 | partition@0x40000 { |
| 86 | label = "params-nor"; |
| 87 | reg = <0x40000 0x40000>; |
| 88 | }; |
| 89 | partition@0x80000 { |
| 90 | label = "kernel-nor"; |
| 91 | reg = <0x80000 0x200000>; |
| 92 | }; |
| 93 | partition@0x280000 { |
| 94 | label = "filesystem-nor"; |
| 95 | reg = <0x240000 0x7d80000>; |
| 96 | }; |
| 97 | }; |
| 98 | }; |