| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 1 | These properties are common to multiple MMC host controllers. Any host |
| 2 | that requires the respective functionality should implement them using |
| 3 | these definitions. |
| 4 | |
| Chris Ball | ed3efc1 | 2012-06-11 22:06:43 -0400 | [diff] [blame] | 5 | Interpreted by the OF core: |
| 6 | - reg: Registers location and length. |
| 7 | - interrupts: Interrupts used by the MMC controller. |
| 8 | |
| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 9 | Required properties: |
| 10 | - bus-width: Number of data lines, can be <1>, <4>, or <8> |
| 11 | |
| Chris Ball | abe1e05 | 2012-08-22 13:21:01 -0400 | [diff] [blame] | 12 | Card detection: |
| Guennadi Liakhovetski | b477426 | 2013-01-16 17:20:41 +0100 | [diff] [blame^] | 13 | If no property below is supplied, host native card detect is used. |
| Chris Ball | abe1e05 | 2012-08-22 13:21:01 -0400 | [diff] [blame] | 14 | Only one of the properties in this section should be supplied: |
| 15 | - broken-cd: There is no card detection available; polling must be used. |
| 16 | - cd-gpios: Specify GPIOs for card detection, see gpio binding |
| 17 | - non-removable: non-removable slot (like eMMC); assume always present. |
| 18 | |
| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 19 | Optional properties: |
| Chris Ball | ed3efc1 | 2012-06-11 22:06:43 -0400 | [diff] [blame] | 20 | - wp-gpios: Specify GPIOs for write protection, see gpio binding |
| 21 | - cd-inverted: when present, polarity on the cd gpio line is inverted |
| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 22 | - wp-inverted: when present, polarity on the wp gpio line is inverted |
| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 23 | - max-frequency: maximum operating clock frequency |
| Daniel Drake | 8ed765a | 2012-11-25 13:02:54 -0500 | [diff] [blame] | 24 | - no-1-8-v: when present, denotes that 1.8v card voltage is not supported on |
| 25 | this system, even if the controller claims it is. |
| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 26 | |
| Abhilash Kesavan | e5d0e9c | 2012-11-19 10:26:19 +0530 | [diff] [blame] | 27 | Optional SDIO properties: |
| 28 | - keep-power-in-suspend: Preserves card power during a suspend/resume cycle |
| 29 | - enable-sdio-wakeup: Enables wake up of host system on SDIO IRQ assertion |
| 30 | |
| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 31 | Example: |
| 32 | |
| 33 | sdhci@ab000000 { |
| 34 | compatible = "sdhci"; |
| 35 | reg = <0xab000000 0x200>; |
| 36 | interrupts = <23>; |
| 37 | bus-width = <4>; |
| 38 | cd-gpios = <&gpio 69 0>; |
| 39 | cd-inverted; |
| 40 | wp-gpios = <&gpio 70 0>; |
| 41 | max-frequency = <50000000>; |
| Abhilash Kesavan | e5d0e9c | 2012-11-19 10:26:19 +0530 | [diff] [blame] | 42 | keep-power-in-suspend; |
| 43 | enable-sdio-wakeup; |
| Arnd Bergmann | 7f21779 | 2012-05-13 00:14:24 -0400 | [diff] [blame] | 44 | } |