diff options
Diffstat (limited to 'drivers/misc/eeprom/digsy_mtc_eeprom.c')
| -rw-r--r-- | drivers/misc/eeprom/digsy_mtc_eeprom.c | 78 |
1 files changed, 45 insertions, 33 deletions
diff --git a/drivers/misc/eeprom/digsy_mtc_eeprom.c b/drivers/misc/eeprom/digsy_mtc_eeprom.c index 66d9e1baeae5..ee58f7ce5bfa 100644 --- a/drivers/misc/eeprom/digsy_mtc_eeprom.c +++ b/drivers/misc/eeprom/digsy_mtc_eeprom.c @@ -1,20 +1,25 @@ +// 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> * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. + * 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.h> +#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> -#include <linux/eeprom_93xx46.h> #define GPIO_EEPROM_CLK 216 #define GPIO_EEPROM_CS 210 @@ -23,28 +28,16 @@ #define GPIO_EEPROM_OE 255 #define EE_SPI_BUS_NUM 1 -static void digsy_mtc_op_prepare(void *p) -{ - /* enable */ - gpio_set_value(GPIO_EEPROM_OE, 0); -} - -static void digsy_mtc_op_finish(void *p) -{ - /* disable */ - gpio_set_value(GPIO_EEPROM_OE, 1); -} +static const struct property_entry digsy_mtc_spi_properties[] = { + PROPERTY_ENTRY_U32("data-size", 8), + { } +}; -struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = { - .flags = EE_ADDR8, - .prepare = digsy_mtc_op_prepare, - .finish = digsy_mtc_op_finish, +static const struct software_node digsy_mtc_spi_node = { + .properties = digsy_mtc_spi_properties, }; static struct spi_gpio_platform_data eeprom_spi_gpio_data = { - .sck = GPIO_EEPROM_CLK, - .mosi = GPIO_EEPROM_DI, - .miso = GPIO_EEPROM_DO, .num_chipselect = 1, }; @@ -56,15 +49,30 @@ static struct platform_device digsy_mtc_eeprom = { }, }; +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 = "93xx46", + .modalias = "eeprom-93xx46", .max_speed_hz = 1000000, .bus_num = EE_SPI_BUS_NUM, .chip_select = 0, .mode = SPI_MODE_0, - .controller_data = (void *)GPIO_EEPROM_CS, - .platform_data = &digsy_mtc_eeprom_data, }, }; @@ -72,14 +80,18 @@ static int __init digsy_mtc_eeprom_devices_init(void) { int ret; - ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH, - "93xx46 EEPROMs OE"); - if (ret) { - pr_err("can't request gpio %d\n", GPIO_EEPROM_OE); - return ret; - } + gpiod_add_lookup_table(&eeprom_spi_gpiod_table); spi_register_board_info(digsy_mtc_eeprom_info, ARRAY_SIZE(digsy_mtc_eeprom_info)); - return platform_device_register(&digsy_mtc_eeprom); + + 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); |