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53126a2f | 1 | * Synopsys Designware Mobile Storage Host Controller |
c91eab4b | 2 | |
53126a2f | 3 | The Synopsys designware mobile storage host controller is used to interface |
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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 | |
53126a2f | 6 | properties used by the Synopsys Designware Mobile Storage Host Controller. |
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7 | |
8 | Required Properties: | |
9 | ||
10 | * compatible: should be | |
53126a2f | 11 | - snps,dw-mshc: for controllers compliant with synopsys dw-mshc. |
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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 | * clock-freq-min-max: Minimum and Maximum clock frequency for card output |
56 | clock(cclk_out). If it's not specified, max is 200MHZ and min is 400KHz by default. | |
57 | ||
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58 | * num-slots: specifies the number of slots supported by the controller. |
59 | The number of physical slots actually used could be equal or less than the | |
60 | value specified by num-slots. If this property is not specified, the value | |
61 | of num-slot property is assumed to be 1. | |
62 | ||
63 | * fifo-depth: The maximum size of the tx/rx fifo's. If this property is not | |
64 | specified, the default value of the fifo size is determined from the | |
65 | controller registers. | |
66 | ||
67 | * card-detect-delay: Delay in milli-seconds before detecting card after card | |
68 | insert event. The default value is 0. | |
69 | ||
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70 | * supports-highspeed (DEPRECATED): Enables support for high speed cards (up to 50MHz) |
71 | (use "cap-mmc-highspeed" or "cap-sd-highspeed" instead) | |
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72 | |
73 | * broken-cd: as documented in mmc core bindings. | |
74 | ||
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75 | * vmmc-supply: The phandle to the regulator to use for vmmc. If this is |
76 | specified we'll defer probe until we can find this regulator. | |
77 | ||
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78 | Aliases: |
79 | ||
80 | - All the MSHC controller nodes should be represented in the aliases node using | |
81 | the following format 'mshc{n}' where n is a unique number for the alias. | |
82 | ||
83 | Example: | |
84 | ||
85 | The MSHC controller node can be split into two portions, SoC specific and | |
86 | board specific portions as listed below. | |
87 | ||
88 | dwmmc0@12200000 { | |
89 | compatible = "snps,dw-mshc"; | |
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90 | clocks = <&clock 351>, <&clock 132>; |
91 | clock-names = "biu", "ciu"; | |
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92 | reg = <0x12200000 0x1000>; |
93 | interrupts = <0 75 0>; | |
94 | #address-cells = <1>; | |
95 | #size-cells = <0>; | |
96 | }; | |
97 | ||
98 | dwmmc0@12200000 { | |
3c6d89ea | 99 | clock-frequency = <400000000>; |
1f44a2a5 | 100 | clock-freq-min-max = <400000 200000000>; |
c91eab4b | 101 | num-slots = <1>; |
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102 | broken-cd; |
103 | fifo-depth = <0x80>; | |
104 | card-detect-delay = <200>; | |
870556a3 | 105 | vmmc-supply = <&buck8>; |
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106 | bus-width = <8>; |
107 | cap-mmc-highspeed; | |
108 | cap-sd-highspeed; | |
c91eab4b | 109 | }; |