// 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/machine.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_gpio.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 const struct property_entry digsy_mtc_spi_properties[] = {
        PROPERTY_ENTRY_U32("data-size", 8),
        { }
};

static const struct software_node digsy_mtc_spi_node = {
        .properties = digsy_mtc_spi_properties,
};

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.1",
        .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),
                GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_OE,
                            "select", GPIO_ACTIVE_LOW),
                { },
        },
};

static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
        {
                .modalias               = "eeprom-93xx46",
                .max_speed_hz           = 1000000,
                .bus_num                = EE_SPI_BUS_NUM,
                .chip_select            = 0,
                .mode                   = SPI_MODE_0,
        },
};

static int __init digsy_mtc_eeprom_devices_init(void)
{
        int ret;

        gpiod_add_lookup_table(&eeprom_spi_gpiod_table);
        spi_register_board_info(digsy_mtc_eeprom_info,
                                ARRAY_SIZE(digsy_mtc_eeprom_info));

        ret = device_add_software_node(&digsy_mtc_eeprom.dev, &digsy_mtc_spi_node);
        if (ret)
                return ret;

        ret = platform_device_register(&digsy_mtc_eeprom);
        if (ret)
                device_remove_software_node(&digsy_mtc_eeprom.dev);

        return ret;
}
device_initcall(digsy_mtc_eeprom_devices_init);