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1 | * Synopsis Designware Mobile Storage Host Controller |
2 | ||
3 | The Synopsis designware mobile storage host controller is used to interface | |
4 | a SoC with storage medium such as eMMC or SD/MMC cards. This file documents | |
5 | differences between the core mmc properties described by mmc.txt and the | |
6 | properties used by the Synopsis Designware Mobile Storage Host Controller. | |
7 | ||
8 | Required Properties: | |
9 | ||
10 | * compatible: should be | |
11 | - snps,dw-mshc: for controllers compliant with synopsis dw-mshc. | |
12 | * #address-cells: should be 1. | |
13 | * #size-cells: should be 0. | |
14 | ||
15 | # Slots: The slot specific information are contained within child-nodes with | |
16 | each child-node representing a supported slot. There should be atleast one | |
17 | child node representing a card slot. The name of the child node representing | |
18 | the slot is recommended to be slot@n where n is the unique number of the slot | |
19 | connnected to the controller. The following are optional properties which | |
20 | can be included in the slot child node. | |
21 | ||
22 | * reg: specifies the physical slot number. The valid values of this | |
23 | property is 0 to (num-slots -1), where num-slots is the value | |
24 | specified by the num-slots property. | |
25 | ||
26 | * bus-width: as documented in mmc core bindings. | |
27 | ||
28 | * wp-gpios: specifies the write protect gpio line. The format of the | |
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29 | gpio specifier depends on the gpio controller. If a GPIO is not used |
30 | for write-protect, this property is optional. | |
31 | ||
32 | * disable-wp: If the wp-gpios property isn't present then (by default) | |
33 | we'd assume that the write protect is hooked up directly to the | |
34 | controller's special purpose write protect line (accessible via | |
35 | the WRTPRT register). However, it's possible that we simply don't | |
36 | want write protect. In that case specify 'disable-wp'. | |
37 | NOTE: This property is not required for slots known to always | |
38 | connect to eMMC or SDIO cards. | |
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39 | |
40 | Optional properties: | |
41 | ||
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42 | * clocks: from common clock binding: handle to biu and ciu clocks for the |
43 | bus interface unit clock and the card interface unit clock. | |
44 | ||
45 | * clock-names: from common clock binding: Shall be "biu" and "ciu". | |
46 | If the biu clock is missing we'll simply skip enabling it. If the | |
47 | ciu clock is missing we'll just assume that the clock is running at | |
48 | clock-frequency. It is an error to omit both the ciu clock and the | |
49 | clock-frequency. | |
50 | ||
51 | * clock-frequency: should be the frequency (in Hz) of the ciu clock. If this | |
52 | is specified and the ciu clock is specified then we'll try to set the ciu | |
53 | clock to this at probe time. | |
54 | ||
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55 | * num-slots: specifies the number of slots supported by the controller. |
56 | The number of physical slots actually used could be equal or less than the | |
57 | value specified by num-slots. If this property is not specified, the value | |
58 | of num-slot property is assumed to be 1. | |
59 | ||
60 | * fifo-depth: The maximum size of the tx/rx fifo's. If this property is not | |
61 | specified, the default value of the fifo size is determined from the | |
62 | controller registers. | |
63 | ||
64 | * card-detect-delay: Delay in milli-seconds before detecting card after card | |
65 | insert event. The default value is 0. | |
66 | ||
f884ab15 | 67 | * supports-highspeed: Enables support for high speed cards (up to 50MHz) |
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68 | |
69 | * broken-cd: as documented in mmc core bindings. | |
70 | ||
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71 | * vmmc-supply: The phandle to the regulator to use for vmmc. If this is |
72 | specified we'll defer probe until we can find this regulator. | |
73 | ||
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74 | Aliases: |
75 | ||
76 | - All the MSHC controller nodes should be represented in the aliases node using | |
77 | the following format 'mshc{n}' where n is a unique number for the alias. | |
78 | ||
79 | Example: | |
80 | ||
81 | The MSHC controller node can be split into two portions, SoC specific and | |
82 | board specific portions as listed below. | |
83 | ||
84 | dwmmc0@12200000 { | |
85 | compatible = "snps,dw-mshc"; | |
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86 | clocks = <&clock 351>, <&clock 132>; |
87 | clock-names = "biu", "ciu"; | |
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88 | reg = <0x12200000 0x1000>; |
89 | interrupts = <0 75 0>; | |
90 | #address-cells = <1>; | |
91 | #size-cells = <0>; | |
92 | }; | |
93 | ||
94 | dwmmc0@12200000 { | |
3c6d89ea | 95 | clock-frequency = <400000000>; |
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96 | num-slots = <1>; |
97 | supports-highspeed; | |
98 | broken-cd; | |
99 | fifo-depth = <0x80>; | |
100 | card-detect-delay = <200>; | |
870556a3 | 101 | vmmc-supply = <&buck8>; |
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102 | |
103 | slot@0 { | |
104 | reg = <0>; | |
105 | bus-width = <8>; | |
106 | }; | |
107 | }; |