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Release 4.14 drivers/mfd/altera-a10sr.c

Directory: drivers/mfd
/*
 * Altera Arria10 DevKit System Resource MFD Driver
 *
 * Author: Thor Thayer <tthayer@opensource.altera.com>
 *
 * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * SPI access for Altera Arria10 MAX5 System Resource Chip
 *
 * Adapted from DA9052
 */

#include <linux/mfd/altera-a10sr.h>
#include <linux/mfd/core.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/spi/spi.h>


static const struct mfd_cell altr_a10sr_subdev_info[] = {
	{
		.name = "altr_a10sr_gpio",
		.of_compatible = "altr,a10sr-gpio",
        },
	{
		.name = "altr_a10sr_reset",
		.of_compatible = "altr,a10sr-reset",
        },
};


static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg) { switch (reg) { case ALTR_A10SR_VERSION_READ: case ALTR_A10SR_LED_REG: case ALTR_A10SR_PBDSW_REG: case ALTR_A10SR_PBDSW_IRQ_REG: case ALTR_A10SR_PWR_GOOD1_REG: case ALTR_A10SR_PWR_GOOD2_REG: case ALTR_A10SR_PWR_GOOD3_REG: case ALTR_A10SR_FMCAB_REG: case ALTR_A10SR_HPS_RST_REG: case ALTR_A10SR_USB_QSPI_REG: case ALTR_A10SR_SFPA_REG: case ALTR_A10SR_SFPB_REG: case ALTR_A10SR_I2C_M_REG: case ALTR_A10SR_WARM_RST_REG: case ALTR_A10SR_WR_KEY_REG: case ALTR_A10SR_PMBUS_REG: return true; default: return false; } }

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static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg) { switch (reg) { case ALTR_A10SR_LED_REG: case ALTR_A10SR_PBDSW_IRQ_REG: case ALTR_A10SR_FMCAB_REG: case ALTR_A10SR_HPS_RST_REG: case ALTR_A10SR_USB_QSPI_REG: case ALTR_A10SR_SFPA_REG: case ALTR_A10SR_SFPB_REG: case ALTR_A10SR_WARM_RST_REG: case ALTR_A10SR_WR_KEY_REG: case ALTR_A10SR_PMBUS_REG: return true; default: return false; } }

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static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg) { switch (reg) { case ALTR_A10SR_PBDSW_REG: case ALTR_A10SR_PBDSW_IRQ_REG: case ALTR_A10SR_PWR_GOOD1_REG: case ALTR_A10SR_PWR_GOOD2_REG: case ALTR_A10SR_PWR_GOOD3_REG: case ALTR_A10SR_HPS_RST_REG: case ALTR_A10SR_I2C_M_REG: case ALTR_A10SR_WARM_RST_REG: case ALTR_A10SR_WR_KEY_REG: case ALTR_A10SR_PMBUS_REG: return true; default: return false; } }

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static const struct regmap_config altr_a10sr_regmap_config = { .reg_bits = 8, .val_bits = 8, .cache_type = REGCACHE_NONE, .use_single_rw = true, .read_flag_mask = 1, .write_flag_mask = 0, .max_register = ALTR_A10SR_WR_KEY_REG, .readable_reg = altr_a10sr_reg_readable, .writeable_reg = altr_a10sr_reg_writeable, .volatile_reg = altr_a10sr_reg_volatile, };
static int altr_a10sr_spi_probe(struct spi_device *spi) { int ret; struct altr_a10sr *a10sr; a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr), GFP_KERNEL); if (!a10sr) return -ENOMEM; spi->mode = SPI_MODE_3; spi->bits_per_word = 8; spi_setup(spi); a10sr->dev = &spi->dev; spi_set_drvdata(spi, a10sr); a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config); if (IS_ERR(a10sr->regmap)) { ret = PTR_ERR(a10sr->regmap); dev_err(&spi->dev, "Failed to allocate register map: %d\n", ret); return ret; } ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO, altr_a10sr_subdev_info, ARRAY_SIZE(altr_a10sr_subdev_info), NULL, 0, NULL); if (ret) dev_err(a10sr->dev, "Failed to register sub-devices: %d\n", ret); return ret; }

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static const struct of_device_id altr_a10sr_spi_of_match[] = { { .compatible = "altr,a10sr" }, { }, }; static struct spi_driver altr_a10sr_spi_driver = { .probe = altr_a10sr_spi_probe, .driver = { .name = "altr_a10sr", .of_match_table = of_match_ptr(altr_a10sr_spi_of_match), }, }; builtin_driver(altr_a10sr_spi_driver, spi_register_driver)

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Directory: drivers/mfd
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