1 # SPDX-License-Identifier: GPL-2.0
4 $id: http://devicetree.org/schemas/memory-controllers/exynos-srom.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Samsung Exynos SoC SROM Controller driver
10 - Krzysztof Kozlowski <krzk@kernel.org>
13 The SROM controller can be used to attach external peripherals. In this case
14 extra properties, describing the bus behind it, should be specified.
19 - const: samsung,exynos4210-srom
32 Reflects the memory layout with four integer values per bank. Format:
33 <bank-number> 0 <parent address of bank> <size>
34 Up to four banks are supported.
37 "^.*@[0-3],[a-f0-9]+$":
40 The actual device nodes should be added as subnodes to the SROMc node.
41 These subnodes, in addition to regular device specification, should
42 contain the following properties, describing configuration
43 of the relevant SROM bank.
48 Bank number, base address (relative to start of the bank) and size
49 of the memory mapped for the device. Note that base address will be
50 typically 0 as this is the start of the bank.
56 Data width in bytes (1 or 2). If omitted, default of 1 is used.
58 samsung,srom-page-mode:
60 If page mode is set, 4 data page mode will be configured,
61 else normal (1 data) page mode will be set.
65 $ref: /schemas/types.yaml#/definitions/uint32-array
70 Array of 6 integers, specifying bank timings in the following order:
71 Tacp, Tcah, Tcoh, Tacc, Tcos, Tacs.
72 Each value is specified in cycles and has the following meaning
74 Tacp: Page mode access cycle at Page mode (0 - 15)
75 Tcah: Address holding time after CSn (0 - 15)
76 Tcoh: Chip selection hold on OEn (0 - 15)
77 Tacc: Access cycle (0 - 31, the actual time is N + 1)
78 Tcos: Chip selection set-up before OEn (0 - 15)
79 Tacs: Address set-up before CSn (0 - 15)
89 additionalProperties: false
93 // Example: basic definition, no banks are configured
94 memory-controller@12560000 {
95 compatible = "samsung,exynos4210-srom";
96 reg = <0x12560000 0x14>;
100 // Example: SROMc with SMSC911x ethernet chip on bank 3
101 memory-controller@12570000 {
102 #address-cells = <2>;
104 ranges = <0 0 0x04000000 0x20000 // Bank0
105 1 0 0x05000000 0x20000 // Bank1
106 2 0 0x06000000 0x20000 // Bank2
107 3 0 0x07000000 0x20000>; // Bank3
109 compatible = "samsung,exynos4210-srom";
110 reg = <0x12570000 0x14>;
113 compatible = "smsc,lan9115";
114 reg = <3 0 0x10000>; // Bank 3, offset = 0
116 interrupt-parent = <&gpx0>;
120 smsc,force-internal-phy;
122 samsung,srom-page-mode;
123 samsung,srom-timing = <9 12 1 9 1 1>;