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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * EEPROMs access control driver for display configuration EEPROMs4 * 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: it9 * should be defined as a bit-banged SPI device and probed from the device10 * tree and not like this with static grabbing of a few numbered GPIO11 * lines at random.12 *13 * Add proper SPI and EEPROM in arch/powerpc/boot/dts/digsy_mtc.dts14 * 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 21625#define GPIO_EEPROM_CS 21026#define GPIO_EEPROM_DI 21727#define GPIO_EEPROM_DO 24928#define GPIO_EEPROM_OE 25529#define EE_SPI_BUS_NUM 130 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",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);98