// SPDX-License-Identifier: GPL-2.0-only /* * EEPROMs access control driver for display configuration EEPROMs * on DigsyMTC board. * * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de> * * FIXME: this driver is used on a device-tree probed platform: it * should be defined as a bit-banged SPI device and probed from the device * tree and not like this with static grabbing of a few numbered GPIO * lines at random. * * Add proper SPI and EEPROM in arch/powerpc/boot/dts/digsy_mtc.dts * and delete this driver. */ #include <linux/gpio.h> #include <linux/gpio/machine.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/spi/spi.h> #include <linux/spi/spi_gpio.h> #include <linux/eeprom_93xx46.h> #define GPIO_EEPROM_CLK 216 #define GPIO_EEPROM_CS 210 #define GPIO_EEPROM_DI 217 #define GPIO_EEPROM_DO 249 #define GPIO_EEPROM_OE 255 #define EE_SPI_BUS_NUM 1 static void digsy_mtc_op_prepare(void *p) { /* enable */ gpio_set_value(GPIO_EEPROM_OE, 0); } static void digsy_mtc_op_finish(void *p) { /* disable */ gpio_set_value(GPIO_EEPROM_OE, 1); } struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = { .flags = EE_ADDR8, .prepare = digsy_mtc_op_prepare, .finish = digsy_mtc_op_finish, }; static struct spi_gpio_platform_data eeprom_spi_gpio_data = { .num_chipselect = 1, }; static struct platform_device digsy_mtc_eeprom = { .name = "spi_gpio", .id = EE_SPI_BUS_NUM, .dev = { .platform_data = &eeprom_spi_gpio_data, }, }; static struct gpiod_lookup_table eeprom_spi_gpiod_table = { .dev_id = "spi_gpio", .table = { GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CLK, "sck", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DI, "mosi", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DO, "miso", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CS, "cs", GPIO_ACTIVE_HIGH), { }, }, }; static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = { { .modalias = "93xx46", .max_speed_hz = 1000000, .bus_num = EE_SPI_BUS_NUM, .chip_select = 0, .mode = SPI_MODE_0, .platform_data = &digsy_mtc_eeprom_data, }, }; static int __init digsy_mtc_eeprom_devices_init(void) { int ret; ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH, "93xx46 EEPROMs OE"); if (ret) { pr_err("can't request gpio %d\n", GPIO_EEPROM_OE); return ret; } gpiod_add_lookup_table(&eeprom_spi_gpiod_table); spi_register_board_info(digsy_mtc_eeprom_info, ARRAY_SIZE(digsy_mtc_eeprom_info)); return platform_device_register(&digsy_mtc_eeprom); } device_initcall(digsy_mtc_eeprom_devices_init);