52b6bbf162
Add gpio driver for TI Palmas series PMIC. This has 8 gpio which can work as input/output. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Based on mainline Linux palmas GPIO driver
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* Copyright(C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
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*/
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#include <dm.h>
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#include <i2c.h>
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#include <asm/gpio.h>
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#include <power/palmas.h>
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#define NUM_GPIOS 8
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static int palmas_gpio_set_value(struct udevice *dev, unsigned int offset,
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int value)
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{
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struct palmas_priv *priv = dev_get_priv(dev->parent);
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u32 reg;
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int ret;
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reg = (value) ? PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
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ret = dm_i2c_reg_write(priv->chip2, reg, BIT(offset));
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if (ret < 0)
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log_debug("%s: Reg 0x%02x write failed, %d\n", __func__, reg, ret);
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return ret;
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}
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static int palmas_gpio_get_value(struct udevice *dev, unsigned int offset)
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{
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struct palmas_priv *priv = dev_get_priv(dev->parent);
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u32 reg;
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int ret;
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ret = dm_i2c_reg_read(priv->chip2, PALMAS_GPIO_DATA_DIR);
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if (ret < 0) {
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log_debug("%s: GPIO_DATA_DIR read failed, %d\n", __func__, ret);
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return ret;
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}
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if (ret & BIT(offset))
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reg = PALMAS_GPIO_DATA_OUT;
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else
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reg = PALMAS_GPIO_DATA_IN;
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ret = dm_i2c_reg_read(priv->chip2, reg);
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if (ret < 0) {
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log_debug("%s: Reg 0x%02x read failed, %d\n", __func__, reg, ret);
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return ret;
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}
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return !!(ret & BIT(offset));
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}
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static int palmas_gpio_direction_input(struct udevice *dev, unsigned int offset)
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{
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struct palmas_priv *priv = dev_get_priv(dev->parent);
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int ret;
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ret = dm_i2c_reg_clrset(priv->chip2, PALMAS_GPIO_DATA_DIR,
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BIT(offset), 0);
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if (ret < 0)
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log_debug("%s: GPIO_DATA_DIR val update failed: %d\n", __func__, ret);
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return ret;
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}
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static int palmas_gpio_direction_output(struct udevice *dev, unsigned int offset,
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int value)
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{
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struct palmas_priv *priv = dev_get_priv(dev->parent);
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int ret;
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/* Set the initial value */
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palmas_gpio_set_value(dev, offset, value);
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ret = dm_i2c_reg_clrset(priv->chip2, PALMAS_GPIO_DATA_DIR,
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BIT(offset), BIT(offset));
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if (ret < 0)
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log_debug("%s: GPIO_DATA_DIR val update failed: %d\n", __func__, ret);
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return ret;
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}
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static int palmas_gpio_get_function(struct udevice *dev, unsigned int offset)
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{
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struct palmas_priv *priv = dev_get_priv(dev->parent);
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int ret;
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ret = dm_i2c_reg_read(priv->chip2, PALMAS_GPIO_DATA_DIR);
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if (ret < 0) {
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log_debug("%s: GPIO_DATA_DIR read failed, %d\n", __func__, ret);
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return ret;
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}
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if (ret & BIT(offset))
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return GPIOF_OUTPUT;
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else
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return GPIOF_INPUT;
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}
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static const struct dm_gpio_ops palmas_gpio_ops = {
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.direction_input = palmas_gpio_direction_input,
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.direction_output = palmas_gpio_direction_output,
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.get_value = palmas_gpio_get_value,
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.set_value = palmas_gpio_set_value,
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.get_function = palmas_gpio_get_function,
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};
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static int palmas_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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uc_priv->gpio_count = NUM_GPIOS;
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uc_priv->bank_name = "GPIO";
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return 0;
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}
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static const struct udevice_id palmas_ids[] = {
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{ .compatible = "ti,palmas-gpio" },
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{ }
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};
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U_BOOT_DRIVER(palmas_gpio) = {
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.name = PALMAS_GPIO_DRIVER,
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.id = UCLASS_GPIO,
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.of_match = palmas_ids,
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.probe = palmas_gpio_probe,
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.ops = &palmas_gpio_ops,
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};
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