6c857ccf4e
When voltage-ranges property is not present the driver assumes that
it is 3.3v (3.2v..3.4v). But at the same time it disallows polling.
Fix that by dropping the comparison to 0 when no property is provided.
While at it, mark voltage-ranges property optional as it was initially.
Fixes: 9c43df57910b ("mmc_spi: Add support for OpenFirmware bindings")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210419112459.25241-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
30 lines
940 B
Plaintext
30 lines
940 B
Plaintext
MMC/SD/SDIO slot directly connected to a SPI bus
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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 mmc_spi driver.
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Required properties:
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- spi-max-frequency : maximum frequency for this device (Hz).
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Optional properties:
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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. If not provided, 3.2v..3.4v is assumed.
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- gpios : may specify GPIOs in this order: Card-Detect GPIO,
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Write-Protect GPIO. Note that this does not follow the
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binding from mmc.txt, for historical reasons.
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Example:
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mmc-slot@0 {
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compatible = "fsl,mpc8323rdb-mmc-slot",
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"mmc-spi-slot";
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reg = <0>;
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gpios = <&qe_pio_d 14 1
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&qe_pio_d 15 0>;
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voltage-ranges = <3300 3300>;
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spi-max-frequency = <50000000>;
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interrupts = <42>;
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interrupt-parent = <&PIC>;
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};
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