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28 lines
1.1 KiB
28 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __MACH_SPI_H_ |
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#define __MACH_SPI_H_ |
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/* |
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* struct spi_imx_master - device.platform_data for SPI controller devices. |
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* @chipselect: Array of chipselects for this master. Numbers >= 0 mean gpio |
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* pins, numbers < 0 mean internal CSPI chipselects according |
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* to MXC_SPI_CS(). Normally you want to use gpio based chip |
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* selects as the CSPI module tries to be intelligent about |
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* when to assert the chipselect: The CSPI module deasserts the |
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* chipselect once it runs out of input data. The other problem |
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* is that it is not possible to mix between high active and low |
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* active chipselects on one single bus using the internal |
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* chipselects. Unfortunately Freescale decided to put some |
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* chipselects on dedicated pins which are not usable as gpios, |
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* so we have to support the internal chipselects. |
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* @num_chipselect: ARRAY_SIZE(chipselect) |
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*/ |
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struct spi_imx_master { |
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int *chipselect; |
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int num_chipselect; |
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}; |
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#define MXC_SPI_CS(no) ((no) - 32) |
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#endif /* __MACH_SPI_H_*/
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