forked from Minki/linux
6e9e318b30
Add function to support getting voltage from device-tree. If voltage-range is specified in device-tree node, this function will parse it and return the available voltage mask. Signed-off-by: Haijun Zhang <haijun.zhang@freescale.com> Acked-by: Anton Vorontsov <anton@enomsg.org> Signed-off-by: Chris Ball <cjb@laptop.org>
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
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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This file documents differences between the core properties described
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by mmc.txt and the properties used by the sdhci-esdhc driver.
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Required properties:
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- interrupt-parent : interrupt source phandle.
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- clock-frequency : specifies eSDHC base clock frequency.
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Optional properties:
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- sdhci,wp-inverted : specifies that eSDHC controller reports
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inverted write-protect state; New devices should use the generic
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"wp-inverted" property.
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- sdhci,1-bit-only : specifies that a controller can only handle
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1-bit data transfers. New devices should use the generic
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"bus-width = <1>" property.
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- sdhci,auto-cmd12: specifies that a controller can only handle auto
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CMD12.
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- voltage-ranges : two cells are required, first cell specifies minimum
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slot voltage (mV), second cell specifies maximum slot voltage (mV).
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Several ranges could be specified.
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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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voltage-ranges = <3300 3300>;
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};
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