include/linux/platform_data/spi-imx.h

   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. Numbers >= 0 mean gpio
   9  *              pins, numbers < 0 mean internal CSPI chipselects according
  10  *              to MXC_SPI_CS(). Normally you want to use gpio based chip
  11  *              selects as the CSPI module tries to be intelligent about
  12  *              when to assert the chipselect: The CSPI module deasserts the
  13  *              chipselect once it runs out of input data. The other problem
  14  *              is that it is not possible to mix between high active and low
  15  *              active chipselects on one single bus using the internal
  16  *              chipselects. Unfortunately Freescale decided to put some
  17  *              chipselects on dedicated pins which are not usable as gpios,
  18  *              so we have to support the internal chipselects.
  19  * @num_chipselect: ARRAY_SIZE(chipselect)
  20  */
  21 struct spi_imx_master {
  22         int     *chipselect;
  23         int     num_chipselect;
  24 };
  25
  26 #define MXC_SPI_CS(no)  ((no) - 32)
  27
  28 #endif /* __MACH_SPI_H_*/