1/*
 2 * EEPROMs access control driver for display configuration EEPROMs
 3 * on DigsyMTC board.
 4 *
 5 * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
 6 *
 7 * This program is free software; you can redistribute it and/or modify
 8 * it under the terms of the GNU General Public License version 2 as
 9 * published by the Free Software Foundation.
 
 
 
 
10 */
11
12#include <linux/gpio.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
 
15#include <linux/spi/spi.h>
16#include <linux/spi/spi_gpio.h>
17#include <linux/eeprom_93xx46.h>
18
19#define GPIO_EEPROM_CLK		216
20#define GPIO_EEPROM_CS		210
21#define GPIO_EEPROM_DI		217
22#define GPIO_EEPROM_DO		249
23#define GPIO_EEPROM_OE		255
24#define EE_SPI_BUS_NUM	1
25
26static void digsy_mtc_op_prepare(void *p)
27{
28	/* enable */
29	gpio_set_value(GPIO_EEPROM_OE, 0);
30}
31
32static void digsy_mtc_op_finish(void *p)
33{
34	/* disable */
35	gpio_set_value(GPIO_EEPROM_OE, 1);
36}
37
38struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = {
39	.flags		= EE_ADDR8,
40	.prepare	= digsy_mtc_op_prepare,
41	.finish		= digsy_mtc_op_finish,
42};
43
44static struct spi_gpio_platform_data eeprom_spi_gpio_data = {
45	.sck		= GPIO_EEPROM_CLK,
46	.mosi		= GPIO_EEPROM_DI,
47	.miso		= GPIO_EEPROM_DO,
48	.num_chipselect	= 1,
49};
50
51static struct platform_device digsy_mtc_eeprom = {
52	.name	= "spi_gpio",
53	.id	= EE_SPI_BUS_NUM,
54	.dev	= {
55		.platform_data	= &eeprom_spi_gpio_data,
56	},
57};
58
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
59static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
60	{
61		.modalias		= "93xx46",
62		.max_speed_hz		= 1000000,
63		.bus_num		= EE_SPI_BUS_NUM,
64		.chip_select		= 0,
65		.mode			= SPI_MODE_0,
66		.controller_data	= (void *)GPIO_EEPROM_CS,
67		.platform_data		= &digsy_mtc_eeprom_data,
68	},
69};
70
71static int __init digsy_mtc_eeprom_devices_init(void)
72{
73	int ret;
74
75	ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH,
76				"93xx46 EEPROMs OE");
77	if (ret) {
78		pr_err("can't request gpio %d\n", GPIO_EEPROM_OE);
79		return ret;
80	}
81	spi_register_board_info(digsy_mtc_eeprom_info,
82				ARRAY_SIZE(digsy_mtc_eeprom_info));
83	return platform_device_register(&digsy_mtc_eeprom);
 
 
 
 
 
 
 
 
 
84}
85device_initcall(digsy_mtc_eeprom_devices_init);

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * EEPROMs access control driver for display configuration EEPROMs
 4 * on DigsyMTC board.
 5 *
 6 * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
 7 *
 8 * FIXME: this driver is used on a device-tree probed platform: it
 9 * should be defined as a bit-banged SPI device and probed from the device
10 * tree and not like this with static grabbing of a few numbered GPIO
11 * lines at random.
12 *
13 * Add proper SPI and EEPROM in arch/powerpc/boot/dts/digsy_mtc.dts
14 * and delete this driver.
15 */
16
17#include <linux/gpio/machine.h>
18#include <linux/init.h>
19#include <linux/platform_device.h>
20#include <linux/property.h>
21#include <linux/spi/spi.h>
22#include <linux/spi/spi_gpio.h>
 
23
24#define GPIO_EEPROM_CLK		216
25#define GPIO_EEPROM_CS		210
26#define GPIO_EEPROM_DI		217
27#define GPIO_EEPROM_DO		249
28#define GPIO_EEPROM_OE		255
29#define EE_SPI_BUS_NUM	1
30
31static const struct property_entry digsy_mtc_spi_properties[] = {
32	PROPERTY_ENTRY_U32("data-size", 8),
33	{ }
34};
 
35
36static const struct software_node digsy_mtc_spi_node = {
37	.properties = digsy_mtc_spi_properties,
 
 
 
 
 
 
 
 
38};
39
40static struct spi_gpio_platform_data eeprom_spi_gpio_data = {
 
 
 
41	.num_chipselect	= 1,
42};
43
44static struct platform_device digsy_mtc_eeprom = {
45	.name	= "spi_gpio",
46	.id	= EE_SPI_BUS_NUM,
47	.dev	= {
48		.platform_data	= &eeprom_spi_gpio_data,
49	},
50};
51
52static struct gpiod_lookup_table eeprom_spi_gpiod_table = {
53	.dev_id         = "spi_gpio.1",
54	.table          = {
55		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CLK,
56			    "sck", GPIO_ACTIVE_HIGH),
57		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DI,
58			    "mosi", GPIO_ACTIVE_HIGH),
59		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DO,
60			    "miso", GPIO_ACTIVE_HIGH),
61		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CS,
62			    "cs", GPIO_ACTIVE_HIGH),
63		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_OE,
64			    "select", GPIO_ACTIVE_LOW),
65		{ },
66	},
67};
68
69static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
70	{
71		.modalias		= "eeprom-93xx46",
72		.max_speed_hz		= 1000000,
73		.bus_num		= EE_SPI_BUS_NUM,
74		.chip_select		= 0,
75		.mode			= SPI_MODE_0,
 
 
76	},
77};
78
79static int __init digsy_mtc_eeprom_devices_init(void)
80{
81	int ret;
82
83	gpiod_add_lookup_table(&eeprom_spi_gpiod_table);
 
 
 
 
 
84	spi_register_board_info(digsy_mtc_eeprom_info,
85				ARRAY_SIZE(digsy_mtc_eeprom_info));
86
87	ret = device_add_software_node(&digsy_mtc_eeprom.dev, &digsy_mtc_spi_node);
88	if (ret)
89		return ret;
90
91	ret = platform_device_register(&digsy_mtc_eeprom);
92	if (ret)
93		device_remove_software_node(&digsy_mtc_eeprom.dev);
94
95	return ret;
96}
97device_initcall(digsy_mtc_eeprom_devices_init);