arch/x86/platform/intel-mid/device_libs/platform_mrfld_spidev.c

   1 /*
   2  * spidev platform data initilization file
   3  *
   4  * (C) Copyright 2014, 2016 Intel Corporation
   5  * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   6  *          Dan O'Donovan <dan@emutex.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; version 2
  11  * of the License.
  12  */
  13
  14 #include <linux/err.h>
  15 #include <linux/init.h>
  16 #include <linux/sfi.h>
  17 #include <linux/spi/pxa2xx_spi.h>
  18 #include <linux/spi/spi.h>
  19
  20 #include <asm/intel-mid.h>
  21
  22 #define MRFLD_SPI_DEFAULT_DMA_BURST     8
  23 #define MRFLD_SPI_DEFAULT_TIMEOUT       500
  24
  25 /* GPIO pin for spidev chipselect */
  26 #define MRFLD_SPIDEV_GPIO_CS            111
  27
  28 static struct pxa2xx_spi_chip spidev_spi_chip = {
  29         .dma_burst_size         = MRFLD_SPI_DEFAULT_DMA_BURST,
  30         .timeout                = MRFLD_SPI_DEFAULT_TIMEOUT,
  31         .gpio_cs                = MRFLD_SPIDEV_GPIO_CS,
  32 };
  33
  34 static void __init *spidev_platform_data(void *info)
  35 {
  36         struct spi_board_info *spi_info = info;
  37
  38         if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
  39                 return ERR_PTR(-ENODEV);
  40
  41         spi_info->mode = SPI_MODE_0;
  42         spi_info->controller_data = &spidev_spi_chip;
  43
  44         return NULL;
  45 }
  46
  47 static const struct devs_id spidev_dev_id __initconst = {
  48         .name                   = "spidev",
  49         .type                   = SFI_DEV_TYPE_SPI,
  50         .delay                  = 0,
  51         .get_platform_data      = &spidev_platform_data,
  52 };
  53
  54 sfi_device(spidev_dev_id);