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Add the DM_MMC-compatible DesignWare MMC driver support for Synopsys ARC devboards. It is created to switch ARC devboards to use DM_MMC. It required information such as clocks (Bus Interface Unit clock, Card Interface Unit clock) and SDIO bus width. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
34 lines
979 B
Plaintext
34 lines
979 B
Plaintext
Synopsys Designware Mobile Storage Host Controller extensions
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used in Synopsys ARC devboards
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Required Properties:
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* compatible: should be - "snps,dw-mshc".
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* bus-width: number of data lines connected to the controller.
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* clocks: from common clock binding: handle to biu and ciu clocks for the
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bus interface unit clock and the card interface unit clock.
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* clock-names: from common clock binding: Shall be "biu" and "ciu".
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Optional properties:
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* fifo-depth: The maximum size of the tx/rx fifo's. If this property is not
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specified, the default value of the fifo size is determined from the
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controller registers.
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* fifo-mode: Don't use DMA.
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* max-frequency: Maximum operating clock frequency, driver uses 'ciu' clock
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frequency if it is not set.
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Example:
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mmc0@f000a000 {
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compatible = "snps,dw-mshc";
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reg = <0xf000a000 0x400>;
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bus-width = <4>;
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fifo-depth = <256>;
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clocks = <&mmcclk_biu>, <&mmcclk_ciu>;
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clock-names = "biu", "ciu";
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max-frequency = <25000000>;
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};
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