arch/arm/plat-mxc/include/mach/spi.h

   1
   2 #ifndef __MACH_SPI_H_
   3 #define __MACH_SPI_H_
   4
   5 /*
   6  * struct spi_imx_master - device.platform_data for SPI controller devices.
   7  * @chipselect: Array of chipselects for this master. Numbers >= 0 mean gpio
   8  *              pins, numbers < 0 mean internal CSPI chipselects according
   9  *              to MXC_SPI_CS(). Normally you want to use gpio based chip
  10  *              selects as the CSPI module tries to be intelligent about
  11  *              when to assert the chipselect: The CSPI module deasserts the
  12  *              chipselect once it runs out of input data. The other problem
  13  *              is that it is not possible to mix between high active and low
  14  *              active chipselects on one single bus using the internal
  15  *              chipselects. Unfortunately Freescale decided to put some
  16  *              chipselects on dedicated pins which are not usable as gpios,
  17  *              so we have to support the internal chipselects.
  18  * @num_chipselect: ARRAY_SIZE(chipselect)
  19  */
  20 struct spi_imx_master {
  21         int     *chipselect;
  22         int     num_chipselect;
  23 };
  24
  25 #define MXC_SPI_CS(no)  ((no) - 32)
  26
  27 #endif /* __MACH_SPI_H_*/