1/* SPDX-License-Identifier: GPL-2.0 */ 2 3#ifndef __MACH_SPI_H_ 4#define __MACH_SPI_H_ 5 6/* 7 * struct spi_imx_master - device.platform_data for SPI controller devices. 8 * @chipselect: Array of chipselects for this master or NULL. Numbers >= 0 9 * mean GPIO pins, -ENOENT means internal CSPI chipselect 10 * matching the position in the array. E.g., if chipselect[1] = 11 * -ENOENT then a SPI slave using chip select 1 will use the 12 * native SS1 line of the CSPI. Omitting the array will use 13 * all native chip selects. 14 15 * Normally you want to use gpio based chip selects as the CSPI 16 * module tries to be intelligent about when to assert the 17 * chipselect: The CSPI module deasserts the chipselect once it 18 * runs out of input data. The other problem is that it is not 19 * possible to mix between high active and low active chipselects 20 * on one single bus using the internal chipselects. 21 * Unfortunately, on some SoCs, Freescale decided to put some 22 * chipselects on dedicated pins which are not usable as gpios, 23 * so we have to support the internal chipselects. 24 * 25 * @num_chipselect: If @chipselect is specified, ARRAY_SIZE(chipselect), 26 * otherwise the number of native chip selects. 27 */ 28struct spi_imx_master { 29 int *chipselect; 30 int num_chipselect; 31}; 32 33#endif /* __MACH_SPI_H_*/ 34