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 
spidev_platform_data(void * info)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);
55