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103 lines
2.6 KiB
103 lines
2.6 KiB
// 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 <[email protected]> |
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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.h> |
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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/spi/spi.h> |
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#include <linux/spi/spi_gpio.h> |
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#include <linux/eeprom_93xx46.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 void digsy_mtc_op_prepare(void *p) |
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{ |
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/* enable */ |
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gpio_set_value(GPIO_EEPROM_OE, 0); |
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} |
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static void digsy_mtc_op_finish(void *p) |
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{ |
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/* disable */ |
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gpio_set_value(GPIO_EEPROM_OE, 1); |
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} |
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struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = { |
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.flags = EE_ADDR8, |
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.prepare = digsy_mtc_op_prepare, |
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.finish = digsy_mtc_op_finish, |
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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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{ }, |
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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 = "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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.platform_data = &digsy_mtc_eeprom_data, |
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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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ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH, |
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"93xx46 EEPROMs OE"); |
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if (ret) { |
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pr_err("can't request gpio %d\n", GPIO_EEPROM_OE); |
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return ret; |
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} |
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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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return platform_device_register(&digsy_mtc_eeprom); |
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} |
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device_initcall(digsy_mtc_eeprom_devices_init);
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