5fe23c7f51
Some hosts (hardware configurations, or particular SD/MMC slots) may not support 4-bit bus. For example, on MPC8569E-MDS boards we can switch between serial (1-bit only) and nibble (4-bit) modes, thought we have to disable more peripherals to work in 4-bit mode. Along with some small core changes, this patch modifies sdhci-of driver, so that now it looks for "sdhci,1-bit-only" property in the device-tree, and if specified we enable a proper quirk. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Pierre Ossman <pierre@ossman.eu>
26 lines
786 B
Plaintext
26 lines
786 B
Plaintext
* Freescale Enhanced Secure Digital Host Controller (eSDHC)
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The Enhanced Secure Digital Host Controller provides an interface
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for MMC, SD, and SDIO types of memory cards.
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Required properties:
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- compatible : should be
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"fsl,<chip>-esdhc", "fsl,esdhc"
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- reg : should contain eSDHC registers location and length.
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- interrupts : should contain eSDHC interrupt.
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- interrupt-parent : interrupt source phandle.
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- clock-frequency : specifies eSDHC base clock frequency.
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- sdhci,1-bit-only : (optional) specifies that a controller can
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only handle 1-bit data transfers.
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Example:
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sdhci@2e000 {
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compatible = "fsl,mpc8378-esdhc", "fsl,esdhc";
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reg = <0x2e000 0x1000>;
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interrupts = <42 0x8>;
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interrupt-parent = <&ipic>;
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/* Filled in by U-Boot */
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clock-frequency = <0>;
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};
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