1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2469dded1SAnatolij Gustschin /*
3469dded1SAnatolij Gustschin * EEPROMs access control driver for display configuration EEPROMs
4469dded1SAnatolij Gustschin * on DigsyMTC board.
5469dded1SAnatolij Gustschin *
6469dded1SAnatolij Gustschin * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
7469dded1SAnatolij Gustschin *
89b00bc7bSLinus Walleij * FIXME: this driver is used on a device-tree probed platform: it
99b00bc7bSLinus Walleij * should be defined as a bit-banged SPI device and probed from the device
109b00bc7bSLinus Walleij * tree and not like this with static grabbing of a few numbered GPIO
119b00bc7bSLinus Walleij * lines at random.
129b00bc7bSLinus Walleij *
139b00bc7bSLinus Walleij * Add proper SPI and EEPROM in arch/powerpc/boot/dts/digsy_mtc.dts
149b00bc7bSLinus Walleij * and delete this driver.
15469dded1SAnatolij Gustschin */
16469dded1SAnatolij Gustschin
179b00bc7bSLinus Walleij #include <linux/gpio/machine.h>
18469dded1SAnatolij Gustschin #include <linux/init.h>
19469dded1SAnatolij Gustschin #include <linux/platform_device.h>
20*c8ed97d8SAndy Shevchenko #include <linux/property.h>
21469dded1SAnatolij Gustschin #include <linux/spi/spi.h>
22469dded1SAnatolij Gustschin #include <linux/spi/spi_gpio.h>
23469dded1SAnatolij Gustschin
24469dded1SAnatolij Gustschin #define GPIO_EEPROM_CLK 216
25469dded1SAnatolij Gustschin #define GPIO_EEPROM_CS 210
26469dded1SAnatolij Gustschin #define GPIO_EEPROM_DI 217
27469dded1SAnatolij Gustschin #define GPIO_EEPROM_DO 249
28469dded1SAnatolij Gustschin #define GPIO_EEPROM_OE 255
29469dded1SAnatolij Gustschin #define EE_SPI_BUS_NUM 1
30469dded1SAnatolij Gustschin
31*c8ed97d8SAndy Shevchenko static const struct property_entry digsy_mtc_spi_properties[] = {
32*c8ed97d8SAndy Shevchenko PROPERTY_ENTRY_U32("data-size", 8),
33*c8ed97d8SAndy Shevchenko { }
34*c8ed97d8SAndy Shevchenko };
35469dded1SAnatolij Gustschin
36*c8ed97d8SAndy Shevchenko static const struct software_node digsy_mtc_spi_node = {
37*c8ed97d8SAndy Shevchenko .properties = digsy_mtc_spi_properties,
38469dded1SAnatolij Gustschin };
39469dded1SAnatolij Gustschin
40469dded1SAnatolij Gustschin static struct spi_gpio_platform_data eeprom_spi_gpio_data = {
41469dded1SAnatolij Gustschin .num_chipselect = 1,
42469dded1SAnatolij Gustschin };
43469dded1SAnatolij Gustschin
44469dded1SAnatolij Gustschin static struct platform_device digsy_mtc_eeprom = {
45469dded1SAnatolij Gustschin .name = "spi_gpio",
46469dded1SAnatolij Gustschin .id = EE_SPI_BUS_NUM,
47469dded1SAnatolij Gustschin .dev = {
48469dded1SAnatolij Gustschin .platform_data = &eeprom_spi_gpio_data,
49469dded1SAnatolij Gustschin },
50469dded1SAnatolij Gustschin };
51469dded1SAnatolij Gustschin
529b00bc7bSLinus Walleij static struct gpiod_lookup_table eeprom_spi_gpiod_table = {
539b00bc7bSLinus Walleij .dev_id = "spi_gpio",
549b00bc7bSLinus Walleij .table = {
559b00bc7bSLinus Walleij GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CLK,
569b00bc7bSLinus Walleij "sck", GPIO_ACTIVE_HIGH),
579b00bc7bSLinus Walleij GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DI,
589b00bc7bSLinus Walleij "mosi", GPIO_ACTIVE_HIGH),
599b00bc7bSLinus Walleij GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DO,
609b00bc7bSLinus Walleij "miso", GPIO_ACTIVE_HIGH),
619b00bc7bSLinus Walleij GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CS,
629b00bc7bSLinus Walleij "cs", GPIO_ACTIVE_HIGH),
63*c8ed97d8SAndy Shevchenko GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_OE,
64*c8ed97d8SAndy Shevchenko "select", GPIO_ACTIVE_LOW),
659b00bc7bSLinus Walleij { },
669b00bc7bSLinus Walleij },
679b00bc7bSLinus Walleij };
689b00bc7bSLinus Walleij
69469dded1SAnatolij Gustschin static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
70469dded1SAnatolij Gustschin {
71*c8ed97d8SAndy Shevchenko .modalias = "eeprom-93xx46",
72469dded1SAnatolij Gustschin .max_speed_hz = 1000000,
73469dded1SAnatolij Gustschin .bus_num = EE_SPI_BUS_NUM,
74469dded1SAnatolij Gustschin .chip_select = 0,
75469dded1SAnatolij Gustschin .mode = SPI_MODE_0,
76469dded1SAnatolij Gustschin },
77469dded1SAnatolij Gustschin };
78469dded1SAnatolij Gustschin
digsy_mtc_eeprom_devices_init(void)79469dded1SAnatolij Gustschin static int __init digsy_mtc_eeprom_devices_init(void)
80469dded1SAnatolij Gustschin {
81469dded1SAnatolij Gustschin int ret;
82469dded1SAnatolij Gustschin
839b00bc7bSLinus Walleij gpiod_add_lookup_table(&eeprom_spi_gpiod_table);
84469dded1SAnatolij Gustschin spi_register_board_info(digsy_mtc_eeprom_info,
85469dded1SAnatolij Gustschin ARRAY_SIZE(digsy_mtc_eeprom_info));
86*c8ed97d8SAndy Shevchenko
87*c8ed97d8SAndy Shevchenko ret = device_add_software_node(&digsy_mtc_eeprom.dev, &digsy_mtc_spi_node);
88*c8ed97d8SAndy Shevchenko if (ret)
89*c8ed97d8SAndy Shevchenko return ret;
90*c8ed97d8SAndy Shevchenko
91*c8ed97d8SAndy Shevchenko ret = platform_device_register(&digsy_mtc_eeprom);
92*c8ed97d8SAndy Shevchenko if (ret)
93*c8ed97d8SAndy Shevchenko device_remove_software_node(&digsy_mtc_eeprom.dev);
94*c8ed97d8SAndy Shevchenko
95*c8ed97d8SAndy Shevchenko return ret;
96469dded1SAnatolij Gustschin }
97469dded1SAnatolij Gustschin device_initcall(digsy_mtc_eeprom_devices_init);
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