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// 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",
.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);
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