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c8ed97d8c3
This converts the driver to use GPIO descriptors exclusively to retrieve GPIO lines. Drop the old GPIO handling in favor of the core managing it exclusively. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20240508184905.2102633-4-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* EEPROMs access control driver for display configuration EEPROMs
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* on DigsyMTC board.
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*
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* (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
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*
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* FIXME: this driver is used on a device-tree probed platform: it
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* should be defined as a bit-banged SPI device and probed from the device
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* tree and not like this with static grabbing of a few numbered GPIO
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* lines at random.
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*
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* Add proper SPI and EEPROM in arch/powerpc/boot/dts/digsy_mtc.dts
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* and delete this driver.
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*/
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#include <linux/gpio/machine.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi_gpio.h>
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#define GPIO_EEPROM_CLK 216
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#define GPIO_EEPROM_CS 210
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#define GPIO_EEPROM_DI 217
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#define GPIO_EEPROM_DO 249
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#define GPIO_EEPROM_OE 255
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#define EE_SPI_BUS_NUM 1
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static const struct property_entry digsy_mtc_spi_properties[] = {
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PROPERTY_ENTRY_U32("data-size", 8),
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{ }
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};
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static const struct software_node digsy_mtc_spi_node = {
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.properties = digsy_mtc_spi_properties,
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};
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static struct spi_gpio_platform_data eeprom_spi_gpio_data = {
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.num_chipselect = 1,
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};
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static struct platform_device digsy_mtc_eeprom = {
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.name = "spi_gpio",
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.id = EE_SPI_BUS_NUM,
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.dev = {
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.platform_data = &eeprom_spi_gpio_data,
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},
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};
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static struct gpiod_lookup_table eeprom_spi_gpiod_table = {
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.dev_id = "spi_gpio",
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.table = {
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GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CLK,
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"sck", GPIO_ACTIVE_HIGH),
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GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DI,
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"mosi", GPIO_ACTIVE_HIGH),
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GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_DO,
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"miso", GPIO_ACTIVE_HIGH),
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GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CS,
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"cs", GPIO_ACTIVE_HIGH),
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GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_OE,
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"select", GPIO_ACTIVE_LOW),
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{ },
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},
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};
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static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
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{
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.modalias = "eeprom-93xx46",
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.max_speed_hz = 1000000,
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.bus_num = EE_SPI_BUS_NUM,
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.chip_select = 0,
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.mode = SPI_MODE_0,
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},
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};
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static int __init digsy_mtc_eeprom_devices_init(void)
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{
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int ret;
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gpiod_add_lookup_table(&eeprom_spi_gpiod_table);
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spi_register_board_info(digsy_mtc_eeprom_info,
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ARRAY_SIZE(digsy_mtc_eeprom_info));
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ret = device_add_software_node(&digsy_mtc_eeprom.dev, &digsy_mtc_spi_node);
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if (ret)
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return ret;
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ret = platform_device_register(&digsy_mtc_eeprom);
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if (ret)
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device_remove_software_node(&digsy_mtc_eeprom.dev);
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return ret;
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}
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device_initcall(digsy_mtc_eeprom_devices_init);
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