xref: /linux/Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml (revision 24168c5e6dfbdd5b414f048f47f75d64533296ca) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/mtd/ti,gpmc-nand.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Texas Instruments GPMC NAND Flash controller.
8
9maintainers:
10  - Tony Lindgren <tony@atomide.com>
11  - Roger Quadros <rogerq@kernel.org>
12
13description:
14  GPMC NAND controller/Flash is represented as a child of the
15  GPMC controller node.
16
17properties:
18  compatible:
19    items:
20      - enum:
21          - ti,am64-nand
22          - ti,omap2-nand
23
24  reg:
25    maxItems: 1
26
27  interrupts:
28    items:
29      - description: Interrupt for fifoevent
30      - description: Interrupt for termcount
31
32  "#address-cells": true
33
34  "#size-cells": true
35
36  ti,nand-ecc-opt:
37    description: Desired ECC algorithm
38    $ref: /schemas/types.yaml#/definitions/string
39    enum: [sw, ham1, bch4, bch8, bch16]
40
41  ti,nand-xfer-type:
42    description: Data transfer method between controller and chip.
43    $ref: /schemas/types.yaml#/definitions/string
44    enum: [prefetch-polled, polled, prefetch-dma, prefetch-irq]
45    default: prefetch-polled
46
47  ti,elm-id:
48    description:
49      phandle to the ELM (Error Location Module).
50    $ref: /schemas/types.yaml#/definitions/phandle
51
52  nand-bus-width:
53    description:
54      Bus width to the NAND chip
55    $ref: /schemas/types.yaml#/definitions/uint32
56    enum: [8, 16]
57    default: 8
58
59  rb-gpios:
60    description:
61      GPIO connection to R/B signal from NAND chip
62    maxItems: 1
63
64patternProperties:
65  "@[0-9a-f]+$":
66    $ref: /schemas/mtd/partitions/partition.yaml
67
68allOf:
69  - $ref: /schemas/memory-controllers/ti,gpmc-child.yaml
70
71required:
72  - compatible
73  - reg
74  - ti,nand-ecc-opt
75
76unevaluatedProperties: false
77
78examples:
79  - |
80    #include <dt-bindings/interrupt-controller/arm-gic.h>
81    #include <dt-bindings/gpio/gpio.h>
82
83    gpmc: memory-controller@50000000 {
84      compatible = "ti,am3352-gpmc";
85      dmas = <&edma 52 0>;
86      dma-names = "rxtx";
87      clocks = <&l3s_gclk>;
88      clock-names = "fck";
89      reg = <0x50000000 0x2000>;
90      interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;
91      gpmc,num-cs = <7>;
92      gpmc,num-waitpins = <2>;
93      #address-cells = <2>;
94      #size-cells = <1>;
95      interrupt-controller;
96      #interrupt-cells = <2>;
97      gpio-controller;
98      #gpio-cells = <2>;
99
100      ranges = <0 0 0x08000000 0x01000000>;   /* CS0 space. Min partition = 16MB */
101      nand@0,0 {
102        compatible = "ti,omap2-nand";
103        reg = <0 0 4>;          /* device IO registers */
104        interrupt-parent = <&gpmc>;
105        interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
106                     <1 IRQ_TYPE_NONE>; /* termcount */
107        ti,nand-xfer-type = "prefetch-dma";
108        ti,nand-ecc-opt = "bch16";
109        ti,elm-id = <&elm>;
110        #address-cells = <1>;
111        #size-cells = <1>;
112
113        /* NAND generic properties */
114        nand-bus-width = <8>;
115        rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>;  /* gpmc_wait0 */
116
117        /* GPMC properties*/
118        gpmc,device-width = <1>;
119
120        partition@0 {
121          label = "NAND.SPL";
122          reg = <0x00000000 0x00040000>;
123        };
124        partition@1 {
125          label = "NAND.SPL.backup1";
126          reg = <0x00040000 0x00040000>;
127        };
128      };
129    };
130