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If CONFIG_DM_GPIO is not enabled, compilation fails with the following errors: aarch64-none-linux-gnu-ld: drivers/power/regulator/regulator_common.o: in function `regulator_common_of_to_plat': <...>/u-boot/drivers/power/regulator/regulator_common.c:30: undefined reference to `gpio_request_by_name' aarch64-none-linux-gnu-ld: drivers/power/regulator/regulator_common.o: in function `regulator_common_get_enable': <...>/u-boot/drivers/power/regulator/regulator_common.c:57: undefined reference to `dm_gpio_get_value' aarch64-none-linux-gnu-ld: drivers/power/regulator/regulator_common.o: in function `regulator_common_set_enable': <...>/u-boot/drivers/power/regulator/regulator_common.c:92: undefined reference to `dm_gpio_set_value' make: *** [Makefile:2029: u-boot] Error 139 Since the enable gpio is optional we can conditionally skip these calls. Reviewed-by: Tanmay Kathpalia <tanmay.kathpalia@altera.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Julien Stephan <jstephan@baylibre.com> Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de> Signed-off-by: Peng Fan <peng.fan@nxp.com>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Disruptive Technologies Research AS
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* Sven Schwermer <sven.svenschwermer@disruptive-technologies.com>
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*/
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#include <dm.h>
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#include <log.h>
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#include <asm/gpio.h>
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#include <linux/delay.h>
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#include <power/regulator.h>
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#include "regulator_common.h"
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int regulator_common_of_to_plat(struct udevice *dev,
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struct regulator_common_plat *plat,
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const char *enable_gpio_name)
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{
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struct gpio_desc *gpio;
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int flags = GPIOD_IS_OUT;
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int ret;
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if (!dev_read_bool(dev, "enable-active-high"))
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flags |= GPIOD_ACTIVE_LOW;
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if (dev_read_bool(dev, "regulator-boot-on"))
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flags |= GPIOD_IS_OUT_ACTIVE;
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/* Get optional enable GPIO desc */
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gpio = &plat->gpio;
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if (CONFIG_IS_ENABLED(DM_GPIO)) {
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ret = gpio_request_by_name(dev, enable_gpio_name, 0, gpio, flags);
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if (ret) {
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debug("Regulator '%s' optional enable GPIO - not found! Error: %d\n",
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dev->name, ret);
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if (ret != -ENOENT)
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return ret;
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}
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}
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/* Get optional ramp up delay */
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plat->startup_delay_us = dev_read_u32_default(dev,
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"startup-delay-us", 0);
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plat->off_on_delay_us = dev_read_u32_default(dev, "off-on-delay-us", 0);
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if (!plat->off_on_delay_us) {
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plat->off_on_delay_us =
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dev_read_u32_default(dev, "u-boot,off-on-delay-us", 0);
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}
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return 0;
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}
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int regulator_common_get_enable(const struct udevice *dev,
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struct regulator_common_plat *plat)
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{
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/* Enable GPIO is optional */
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if (CONFIG_IS_ENABLED(DM_GPIO) && dm_gpio_is_valid(&plat->gpio))
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return dm_gpio_get_value(&plat->gpio);
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return true;
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}
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int regulator_common_set_enable(const struct udevice *dev,
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struct regulator_common_plat *plat, bool enable)
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{
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int ret;
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debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
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dev->name, enable, plat->startup_delay_us,
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dm_gpio_is_valid(&plat->gpio));
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/* Enable GPIO is optional */
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if (CONFIG_IS_ENABLED(DM_GPIO) && dm_gpio_is_valid(&plat->gpio)) {
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/* If previously enabled, increase count */
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if (enable && plat->enable_count > 0) {
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plat->enable_count++;
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return -EALREADY;
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}
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if (!enable) {
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if (plat->enable_count > 1) {
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/* If enabled multiple times, decrease count */
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plat->enable_count--;
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return -EBUSY;
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} else if (!plat->enable_count) {
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/* If already disabled, do nothing */
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return -EALREADY;
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}
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}
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ret = dm_gpio_set_value(&plat->gpio, enable);
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if (ret) {
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pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
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enable);
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return ret;
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}
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if (enable && plat->startup_delay_us)
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udelay(plat->startup_delay_us);
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if (!enable && plat->off_on_delay_us)
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udelay(plat->off_on_delay_us);
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if (enable)
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plat->enable_count++;
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else
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plat->enable_count--;
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} else {
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ret = enable ? 0 : -ENOSYS;
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}
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return ret;
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}
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