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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree-bindings/mmc/snps,dw-mmc.txt | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/mmc/snps,dw-mmc.txt b/doc/device-tree-bindings/mmc/snps,dw-mmc.txt new file mode 100644 index 0000000..69faefa --- /dev/null +++ b/doc/device-tree-bindings/mmc/snps,dw-mmc.txt @@ -0,0 +1,33 @@ +Synopsys Designware Mobile Storage Host Controller extensions +used in Synopsys ARC devboards + +Required Properties: + +* compatible: should be - "snps,dw-mshc". +* bus-width: number of data lines connected to the controller. +* clocks: from common clock binding: handle to biu and ciu clocks for the + bus interface unit clock and the card interface unit clock. +* clock-names: from common clock binding: Shall be "biu" and "ciu". + +Optional properties: + +* fifo-depth: The maximum size of the tx/rx fifo's. If this property is not + specified, the default value of the fifo size is determined from the + controller registers. +* fifo-mode: Don't use DMA. +* max-frequency: Maximum operating clock frequency, driver uses 'ciu' clock + frequency if it is not set. + +Example: + +mmc0@f000a000 { + compatible = "snps,dw-mshc"; + reg = <0xf000a000 0x400>; + + bus-width = <4>; + fifo-depth = <256>; + clocks = <&mmcclk_biu>, <&mmcclk_ciu>; + clock-names = "biu", "ciu"; + max-frequency = <25000000>; +}; + |