target/linux/generic-2.6/files/include/linux/spi/spi_gpio.h

   1 /*
   2  * spi_gpio interface to platform code
   3  *
   4  * Copyright (c) 2008 Piotr Skamruk
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #ifndef _LINUX_SPI_SPI_GPIO
  11 #define _LINUX_SPI_SPI_GPIO
  12
  13 #include <linux/types.h>
  14 #include <linux/spi/spi.h>
  15
  16
  17 /** struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
  18  * This structure holds information about a GPIO-based SPI device.
  19  *
  20  * @pin_clk: The GPIO pin number of the CLOCK pin.
  21  *
  22  * @pin_miso: The GPIO pin number of the MISO pin.
  23  *
  24  * @pin_mosi: The GPIO pin number of the MOSI pin.
  25  *
  26  * @pin_cs: The GPIO pin number of the CHIPSELECT pin.
  27  *
  28  * @cs_activelow: If true, the chip is selected when the CS line is low.
  29  *
  30  * @no_spi_delay: If true, no delay is done in the lowlevel bitbanging.
  31  *                Note that doing no delay is not standards compliant,
  32  *                but it might be needed to speed up transfers on some
  33  *                slow embedded machines.
  34  *
  35  * @boardinfo_setup: This callback is called after the
  36  *                   SPI master device was registered, but before the
  37  *                   device is registered.
  38  * @boardinfo_setup_data: Data argument passed to boardinfo_setup().
  39  */
  40 struct spi_gpio_platform_data {
  41         unsigned int pin_clk;
  42         unsigned int pin_miso;
  43         unsigned int pin_mosi;
  44         unsigned int pin_cs;
  45         bool cs_activelow;
  46         bool no_spi_delay;
  47         int (*boardinfo_setup)(struct spi_board_info *bi,
  48                                struct spi_master *master,
  49                                void *data);
  50         void *boardinfo_setup_data;
  51 };
  52
  53 #endif /* _LINUX_SPI_SPI_GPIO */