1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * spidev platform data initialization file
4  *
5  * (C) Copyright 2014, 2016 Intel Corporation
6  * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7  *	    Dan O'Donovan <dan@emutex.com>
8  */
9 
10 #include <linux/err.h>
11 #include <linux/init.h>
12 #include <linux/sfi.h>
13 #include <linux/spi/pxa2xx_spi.h>
14 #include <linux/spi/spi.h>
15 
16 #include <asm/intel-mid.h>
17 
18 #define MRFLD_SPI_DEFAULT_DMA_BURST	8
19 #define MRFLD_SPI_DEFAULT_TIMEOUT	500
20 
21 /* GPIO pin for spidev chipselect */
22 #define MRFLD_SPIDEV_GPIO_CS		111
23 
24 static struct pxa2xx_spi_chip spidev_spi_chip = {
25 	.dma_burst_size		= MRFLD_SPI_DEFAULT_DMA_BURST,
26 	.timeout		= MRFLD_SPI_DEFAULT_TIMEOUT,
27 	.gpio_cs		= MRFLD_SPIDEV_GPIO_CS,
28 };
29 
spidev_platform_data(void * info)30 static void __init *spidev_platform_data(void *info)
31 {
32 	struct spi_board_info *spi_info = info;
33 
34 	if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
35 		return ERR_PTR(-ENODEV);
36 
37 	spi_info->mode = SPI_MODE_0;
38 	spi_info->controller_data = &spidev_spi_chip;
39 
40 	return NULL;
41 }
42 
43 static const struct devs_id spidev_dev_id __initconst = {
44 	.name			= "spidev",
45 	.type			= SFI_DEV_TYPE_SPI,
46 	.delay			= 0,
47 	.get_platform_data	= &spidev_platform_data,
48 };
49 
50 sfi_device(spidev_dev_id);
51