70739a1e74
IT8801 support GPIO alternate function switching. Some GPIO pins can be switched as KSO or PWM function. Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
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* Copyright (c) 2024 ITE Corporation. All Rights Reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT ite_it8801_altctrl
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/mfd/mfd_ite_it8801.h>
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#include <zephyr/dt-bindings/mfd/mfd_it8801_altctrl.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(mfd_it8801_altctrl, LOG_LEVEL_ERR);
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struct mfd_altfunc_config {
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/* gpiocr register */
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uint8_t reg_gpiocr;
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};
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int mfd_it8801_configure_pins(const struct i2c_dt_spec *i2c_dev, const struct device *dev,
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uint8_t pin, uint8_t func)
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{
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const struct mfd_altfunc_config *config = dev->config;
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int ret;
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uint8_t reg_gpiocr = config->reg_gpiocr + pin;
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uint8_t alt_val;
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switch (func) {
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case IT8801_ALT_FUNC_1:
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/* Func1: Default GPIO setting */
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alt_val = IT8801_GPIOAFS_FUN1;
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break;
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case IT8801_ALT_FUNC_2:
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/* Func2: KSO or PWM setting */
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alt_val = IT8801_GPIOAFS_FUN2;
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break;
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case IT8801_ALT_FUNC_3:
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/* Func3: PWM setting */
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alt_val = IT8801_GPIOAFS_FUN3;
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break;
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case IT8801_ALT_DEFAULT:
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alt_val = IT8801_GPIOAFS_FUN1;
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break;
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default:
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LOG_ERR("This function is not supported.");
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return -EINVAL;
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}
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/* Common settings for alternate function. */
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ret = i2c_reg_update_byte_dt(i2c_dev, reg_gpiocr, GENMASK(7, 6), alt_val << 6);
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if (ret != 0) {
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LOG_ERR("Failed to update gpiocr (ret %d)", ret);
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return ret;
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}
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return 0;
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}
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#define MFD_IT8801_ALTCTRL_INIT(inst) \
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static const struct mfd_altfunc_config it8801_mfd_alt_cfg_##inst = { \
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.reg_gpiocr = DT_INST_REG_ADDR(inst), \
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}; \
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DEVICE_DT_INST_DEFINE(inst, NULL, NULL, NULL, &it8801_mfd_alt_cfg_##inst, POST_KERNEL, \
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CONFIG_MFD_INIT_PRIORITY, NULL);
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DT_INST_FOREACH_STATUS_OKAY(MFD_IT8801_ALTCTRL_INIT)
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