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Diffstat (limited to 'Documentation/devicetree/bindings/mmc/mmci.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/mmci.txt | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmci.txt b/Documentation/devicetree/bindings/mmc/mmci.txt new file mode 100644 index 000000000..4ec921e4b --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/mmci.txt @@ -0,0 +1,74 @@ +* ARM PrimeCell MultiMedia Card Interface (MMCI) PL180/1 + +The ARM PrimeCell MMCI PL180 and PL181 provides an interface for +reading and writing to MultiMedia and SD cards alike. + +This file documents differences between the core properties described +by mmc.txt and the properties used by the mmci driver. Using "st" as +the prefix for a property, indicates support by the ST Micro variant. + +Required properties: +- compatible : contains "arm,pl18x", "arm,primecell". +- vmmc-supply : phandle to the regulator device tree node, mentioned + as the VCC/VDD supply in the eMMC/SD specs. + +Optional properties: +- arm,primecell-periphid : contains the PrimeCell Peripheral ID, it overrides + the ID provided by the HW +- resets : phandle to internal reset line. + Should be defined for sdmmc variant. +- vqmmc-supply : phandle to the regulator device tree node, mentioned + as the VCCQ/VDD_IO supply in the eMMC/SD specs. +specific for ux500 variant: +- st,sig-dir-dat0 : bus signal direction pin used for DAT[0]. +- st,sig-dir-dat2 : bus signal direction pin used for DAT[2]. +- st,sig-dir-dat31 : bus signal direction pin used for DAT[3] and DAT[1]. +- st,sig-dir-dat74 : bus signal direction pin used for DAT[4] to DAT[7]. +- st,sig-dir-cmd : cmd signal direction pin used for CMD. +- st,sig-pin-fbclk : feedback clock signal pin used. + +specific for sdmmc variant: +- reg : a second base register may be defined if a delay + block is present and used for tuning. +- st,sig-dir : signal direction polarity used for cmd, dat0 dat123. +- st,neg-edge : data & command phase relation, generated on + sd clock falling edge. +- st,use-ckin : use ckin pin from an external driver to sample + the receive data (example: with voltage + switch transceiver). + +Deprecated properties: +- mmc-cap-mmc-highspeed : indicates whether MMC is high speed capable. +- mmc-cap-sd-highspeed : indicates whether SD is high speed capable. + +Example: + +sdi0_per1@80126000 { + compatible = "arm,pl18x", "arm,primecell"; + reg = <0x80126000 0x1000>; + interrupts = <0 60 IRQ_TYPE_LEVEL_HIGH>; + + dmas = <&dma 29 0 0x2>, /* Logical - DevToMem */ + <&dma 29 0 0x0>; /* Logical - MemToDev */ + dma-names = "rx", "tx"; + + clocks = <&prcc_kclk 1 5>, <&prcc_pclk 1 5>; + clock-names = "sdi", "apb_pclk"; + + max-frequency = <100000000>; + bus-width = <4>; + cap-sd-highspeed; + cap-mmc-highspeed; + cd-gpios = <&gpio2 31 0x4>; // 95 + st,sig-dir-dat0; + st,sig-dir-dat2; + st,sig-dir-cmd; + st,sig-pin-fbclk; + + vmmc-supply = <&ab8500_ldo_aux3_reg>; + vqmmc-supply = <&vmmci>; + + pinctrl-names = "default", "sleep"; + pinctrl-0 = <&sdi0_default_mode>; + pinctrl-1 = <&sdi0_sleep_mode>; +}; |