gpmi-nand.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/mtd/gpmi-nand.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Freescale General-Purpose Media Interface (GPMI) binding
    8 
    9 maintainers:
   10   - Han Xu <han.xu@nxp.com>
   11 
   12 description: |
   13   The GPMI nand controller provides an interface to control the NAND
   14   flash chips. The device tree may optionally contain sub-nodes
   15   describing partitions of the address space. See partition.txt for
   16   more detail.
   17 
   18 properties:
   19   compatible:
   20     oneOf:
   21       - enum:
   22           - fsl,imx23-gpmi-nand
   23           - fsl,imx28-gpmi-nand
   24           - fsl,imx6q-gpmi-nand
   25           - fsl,imx6sx-gpmi-nand
   26           - fsl,imx7d-gpmi-nand
   27       - items:
   28           - enum:
   29               - fsl,imx8mm-gpmi-nand
   30               - fsl,imx8mn-gpmi-nand
   31           - const: fsl,imx7d-gpmi-nand
   32 
   33   reg:
   34     items:
   35       - description: Address and length of gpmi block.
   36       - description: Address and length of bch block.
   37 
   38   reg-names:
   39     items:
   40       - const: gpmi-nand
   41       - const: bch
   42 
   43   interrupts:
   44     maxItems: 1
   45 
   46   interrupt-names:
   47     const: bch
   48 
   49   dmas:
   50     maxItems: 1
   51 
   52   dma-names:
   53     const: rx-tx
   54 
   55   clocks:
   56     minItems: 1
   57     maxItems: 5
   58 
   59   clock-names:
   60     minItems: 1
   61     maxItems: 5
   62 
   63   fsl,use-minimum-ecc:
   64     type: boolean
   65     description: |
   66       Protect this NAND flash with the minimum ECC strength required.
   67       The required ECC strength is automatically discoverable for some
   68       flash (e.g., according to the ONFI standard). However, note that
   69       if this strength is not discoverable or this property is not enabled,
   70       the software may chooses an implementation-defined ECC scheme.
   71 
   72   fsl,no-blockmark-swap:
   73     type: boolean
   74     description: |
   75       Don't swap the bad block marker from the OOB area with the byte in
   76       the data area but rely on the flash based BBT for identifying bad blocks.
   77       NOTE: this is only valid in conjunction with 'nand-on-flash-bbt'.
   78       WARNING: on i.MX28 blockmark swapping cannot be disabled for the BootROM
   79       in the FCB. Thus, partitions written from Linux with this feature turned
   80       on may not be accessible by the BootROM code.
   81 
   82 required:
   83   - compatible
   84   - reg
   85   - reg-names
   86   - interrupts
   87   - interrupt-names
   88   - clocks
   89   - clock-names
   90   - dmas
   91   - dma-names
   92 
   93 unevaluatedProperties: false
   94 
   95 allOf:
   96   - $ref: "nand-controller.yaml"
   97 
   98   - if:
   99       properties:
  100         compatible:
  101           contains:
  102             enum:
  103               - fsl,imx23-gpmi-nand
  104               - fsl,imx28-gpmi-nand
  105     then:
  106       properties:
  107         clocks:
  108           items:
  109             - description: SoC gpmi io clock
  110         clock-names:
  111           items:
  112             - const: gpmi_io
  113 
  114   - if:
  115       properties:
  116         compatible:
  117           contains:
  118             enum:
  119               - fsl,imx6q-gpmi-nand
  120               - fsl,imx6sx-gpmi-nand
  121     then:
  122       properties:
  123         clocks:
  124           items:
  125             - description: SoC gpmi io clock
  126             - description: SoC gpmi apb clock
  127             - description: SoC gpmi bch clock
  128             - description: SoC gpmi bch apb clock
  129             - description: SoC per1 bch clock
  130         clock-names:
  131           items:
  132             - const: gpmi_io
  133             - const: gpmi_apb
  134             - const: gpmi_bch
  135             - const: gpmi_bch_apb
  136             - const: per1_bch
  137 
  138   - if:
  139       properties:
  140         compatible:
  141           contains:
  142             const: fsl,imx7d-gpmi-nand
  143     then:
  144       properties:
  145         clocks:
  146           items:
  147             - description: SoC gpmi io clock
  148             - description: SoC gpmi bch apb clock
  149         clock-names:
  150           items:
  151             - const: gpmi_io
  152             - const: gpmi_bch_apb
  153 
  154 examples:
  155   - |
  156     nand-controller@8000c000 {
  157         #address-cells = <1>;
  158         #size-cells = <0>;
  159         compatible = "fsl,imx28-gpmi-nand";
  160         reg = <0x8000c000 0x2000>, <0x8000a000 0x2000>;
  161         reg-names = "gpmi-nand", "bch";
  162         interrupts = <41>;
  163         interrupt-names = "bch";
  164         clocks = <&clks 50>;
  165         clock-names = "gpmi_io";
  166         dmas = <&dma_apbh 4>;
  167         dma-names = "rx-tx";
  168     };

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