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.h>
 18#include <linux/gpio/machine.h>
 19#include <linux/init.h>
 20#include <linux/platform_device.h>
 21#include <linux/spi/spi.h>
 22#include <linux/spi/spi_gpio.h>
 23#include <linux/eeprom_93xx46.h>
 24
 25#define GPIO_EEPROM_CLK		216
 26#define GPIO_EEPROM_CS		210
 27#define GPIO_EEPROM_DI		217
 28#define GPIO_EEPROM_DO		249
 29#define GPIO_EEPROM_OE		255
 30#define EE_SPI_BUS_NUM	1
 31
 32static void digsy_mtc_op_prepare(void *p)
 33{
 34	/* enable */
 35	gpio_set_value(GPIO_EEPROM_OE, 0);
 36}
 37
 38static void digsy_mtc_op_finish(void *p)
 39{
 40	/* disable */
 41	gpio_set_value(GPIO_EEPROM_OE, 1);
 42}
 43
 44struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = {
 45	.flags		= EE_ADDR8,
 46	.prepare	= digsy_mtc_op_prepare,
 47	.finish		= digsy_mtc_op_finish,
 48};
 49
 50static struct spi_gpio_platform_data eeprom_spi_gpio_data = {
 
 
 
 51	.num_chipselect	= 1,
 52};
 53
 54static struct platform_device digsy_mtc_eeprom = {
 55	.name	= "spi_gpio",
 56	.id	= EE_SPI_BUS_NUM,
 57	.dev	= {
 58		.platform_data	= &eeprom_spi_gpio_data,
 59	},
 60};
 61
 62static struct gpiod_lookup_table eeprom_spi_gpiod_table = {
 63	.dev_id         = "spi_gpio",
 64	.table          = {
 65		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CLK,
 66			    "sck", GPIO_ACTIVE_HIGH),
 67		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DI,
 68			    "mosi", GPIO_ACTIVE_HIGH),
 69		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DO,
 70			    "miso", GPIO_ACTIVE_HIGH),
 71		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CS,
 72			    "cs", GPIO_ACTIVE_HIGH),
 73		{ },
 74	},
 75};
 76
 77static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
 78	{
 79		.modalias		= "93xx46",
 80		.max_speed_hz		= 1000000,
 81		.bus_num		= EE_SPI_BUS_NUM,
 82		.chip_select		= 0,
 83		.mode			= SPI_MODE_0,
 
 84		.platform_data		= &digsy_mtc_eeprom_data,
 85	},
 86};
 87
 88static int __init digsy_mtc_eeprom_devices_init(void)
 89{
 90	int ret;
 91
 92	ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH,
 93				"93xx46 EEPROMs OE");
 94	if (ret) {
 95		pr_err("can't request gpio %d\n", GPIO_EEPROM_OE);
 96		return ret;
 97	}
 98	gpiod_add_lookup_table(&eeprom_spi_gpiod_table);
 99	spi_register_board_info(digsy_mtc_eeprom_info,
100				ARRAY_SIZE(digsy_mtc_eeprom_info));
101	return platform_device_register(&digsy_mtc_eeprom);
102}
103device_initcall(digsy_mtc_eeprom_devices_init);