Based on kernel version 3.7. Page generated on 2012-12-12 10:00 EST.
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 29 gpio specifier depends on the gpio controller. If the write-protect 30 line is not available, this property is optional. 31 32 Optional properties: 33 34 * num-slots: specifies the number of slots supported by the controller. 35 The number of physical slots actually used could be equal or less than the 36 value specified by num-slots. If this property is not specified, the value 37 of num-slot property is assumed to be 1. 38 39 * fifo-depth: The maximum size of the tx/rx fifo's. If this property is not 40 specified, the default value of the fifo size is determined from the 41 controller registers. 42 43 * card-detect-delay: Delay in milli-seconds before detecting card after card 44 insert event. The default value is 0. 45 46 * supports-highspeed: Enables support for high speed cards (upto 50MHz) 47 48 * broken-cd: as documented in mmc core bindings. 49 50 Aliases: 51 52 - All the MSHC controller nodes should be represented in the aliases node using 53 the following format 'mshc{n}' where n is a unique number for the alias. 54 55 Example: 56 57 The MSHC controller node can be split into two portions, SoC specific and 58 board specific portions as listed below. 59 60 dwmmc0@12200000 { 61 compatible = "snps,dw-mshc"; 62 reg = <0x12200000 0x1000>; 63 interrupts = <0 75 0>; 64 #address-cells = <1>; 65 #size-cells = <0>; 66 }; 67 68 dwmmc0@12200000 { 69 num-slots = <1>; 70 supports-highspeed; 71 broken-cd; 72 fifo-depth = <0x80>; 73 card-detect-delay = <200>; 74 75 slot@0 { 76 reg = <0>; 77 bus-width = <8>; 78 }; 79 };