// 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);
Messung V0.5 in Prozent C=98 H=100 G=98
¤ Dauer der Verarbeitung: 0.9 Sekunden
(vorverarbeitet am 2026-09-28)
¤
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