gpmc-nor.txt

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    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/memory-controllers/omap-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.yaml
   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.yaml
   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/memory-controllers/omap-gpmc.txt
   32 
   33 Optional properties for partition table parsing:
   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@40000 {
   86                         label = "params-nor";
   87                         reg = <0x40000 0x40000>;
   88                 };
   89                 partition@80000 {
   90                         label = "kernel-nor";
   91                         reg = <0x80000 0x200000>;
   92                 };
   93                 partition@280000 {
   94                         label = "filesystem-nor";
   95                         reg = <0x240000 0x7d80000>;
   96                 };
   97         };
   98 };

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