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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* max7320 I2C GPIO EXPANDER DRIVER
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*
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* Copyright (C) 2021 Hannes Schmelzer <oe5hpm@oevsv.at>
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* B&R Industrial Automation GmbH - http://www.br-automation.com
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <asm-generic/gpio.h>
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#include <linux/bitops.h>
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struct max7320_chip {
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u32 outreg;
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};
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static int max7320_direction_output(struct udevice *dev,
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unsigned int offset, int value)
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{
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struct max7320_chip *plat = dev_get_plat(dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
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int ret;
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if (value)
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plat->outreg |= BIT(offset);
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else
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plat->outreg &= ~BIT(offset);
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ret = dm_i2c_write(dev,
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plat->outreg & 0xff,
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(uint8_t *)&plat->outreg + 1,
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uc_priv->gpio_count > 8 ? 1 : 0);
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if (ret)
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printf("%s i2c write failed to addr %x\n", __func__,
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chip->chip_addr);
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return ret;
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}
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static int max7320_get_value(struct udevice *dev, unsigned int offset)
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{
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struct max7320_chip *plat = dev_get_plat(dev);
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return (plat->outreg >> offset) & 0x1;
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}
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static int max7320_set_value(struct udevice *dev, unsigned int offset,
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int value)
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{
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return max7320_direction_output(dev, offset, value);
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}
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static int max7320_get_function(struct udevice *dev, unsigned int offset)
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{
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return GPIOF_OUTPUT;
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}
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static int max7320_ofdata_plat(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 8);
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if (uc_priv->gpio_count > 16) {
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printf("%s: max7320 doesn't support more than 16 gpios!",
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__func__);
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return -EINVAL;
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}
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uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
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"gpio-bank-name", NULL);
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if (!uc_priv->bank_name)
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uc_priv->bank_name = fdt_get_name(gd->fdt_blob,
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dev_of_offset(dev), NULL);
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return 0;
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}
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static int max7320_gpio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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debug("%s GPIO controller with %d gpios probed\n",
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uc_priv->bank_name, uc_priv->gpio_count);
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return 0;
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}
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static const struct dm_gpio_ops max7320_gpio_ops = {
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.direction_output = max7320_direction_output,
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.set_value = max7320_set_value,
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.get_value = max7320_get_value,
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.get_function = max7320_get_function,
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};
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static const struct udevice_id max7320_gpio_ids[] = {
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{ .compatible = "maxim,max7320" },
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{ }
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};
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U_BOOT_DRIVER(gpio_max7320) = {
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.name = "gpio_max7320",
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.id = UCLASS_GPIO,
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.ops = &max7320_gpio_ops,
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.of_match = max7320_gpio_ids,
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.of_to_plat = max7320_ofdata_plat,
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.probe = max7320_gpio_probe,
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.plat_auto = sizeof(struct max7320_chip),
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};
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