drivers/generic/gpio_regulator: Drop unused driver for gpio_regulator
Proposal for gpio_regulator usage in ACPI never got accepted upstream for Linux kernel. So, the gpio_regulator driver in coreboot remains unused. This change drops this unused driver. Change-Id: Ia1e0ae4f955b9ffc8346d957f755499419d8cbc7 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/42966 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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# SPDX-License-Identifier: GPL-2.0-only
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config DRIVERS_GENERIC_GPIO_REGULATOR
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bool
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depends on HAVE_ACPI_TABLES
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# SPDX-License-Identifier: GPL-2.0-only
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ramstage-$(CONFIG_DRIVERS_GENERIC_GPIO_REGULATOR) += gpio_regulator.c
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/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __DRIVERS_GENERIC_GPIO_REGULATOR_H__
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#define __DRIVERS_GENERIC_GPIO_REGULATOR_H__
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#include <acpi/acpi_device.h>
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struct drivers_generic_gpio_regulator_config {
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const char *name;
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struct acpi_gpio gpio;
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bool enabled_on_boot;
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};
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#endif /* __DRIVERS_GENERIC_GPIO_REGULATOR_H__ */
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/* SPDX-License-Identifier: GPL-2.0-only */
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#include <acpi/acpi_device.h>
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#include <acpi/acpigen.h>
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#include <device/device.h>
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#include <device/path.h>
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#include <string.h>
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#include "chip.h"
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static void gpio_regulator_fill_ssdt_generator(const struct device *dev)
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{
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struct drivers_generic_gpio_regulator_config *config = dev->chip_info;
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const char *scope = acpi_device_scope(dev);
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const char *path = acpi_device_path(dev);
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struct acpi_dp *dsd;
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if (!dev->enabled || !scope || !path || !config->gpio.pin_count)
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return;
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/* Device */
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acpigen_write_scope(scope);
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acpigen_write_device(acpi_device_name(dev));
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/* _HID is set to PRP0001 */
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acpigen_write_name_string("_HID", ACPI_DT_NAMESPACE_HID);
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/* Resources - _CRS */
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acpigen_write_name("_CRS");
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acpigen_write_resourcetemplate_header();
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acpi_device_write_gpio(&config->gpio);
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acpigen_write_resourcetemplate_footer();
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/* DSD */
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dsd = acpi_dp_new_table("_DSD");
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acpi_dp_add_string(dsd, "compatible", "regulator-fixed");
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acpi_dp_add_string(dsd, "regulator-name", config->name);
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acpi_dp_add_gpio(dsd, "gpio-gpios", path, 0, 0, config->gpio.polarity);
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if (config->enabled_on_boot)
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acpi_dp_add_string(dsd, "regulator-boot-on", "on");
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if (config->gpio.polarity == ACPI_GPIO_ACTIVE_HIGH)
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acpi_dp_add_string(dsd, "enable-active-high", "on");
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acpi_dp_write(dsd);
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acpigen_pop_len(); /* Device */
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acpigen_pop_len(); /* Scope */
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}
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static const char *gpio_regulator_acpi_name(const struct device *dev)
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{
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struct drivers_generic_gpio_regulator_config *config = dev->chip_info;
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static char name[5];
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snprintf(name, sizeof(name), "R%03.3X", config->gpio.pins[0]);
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name[4] = '\0';
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return name;
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}
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static struct device_operations gpio_regulator_ops = {
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.read_resources = noop_read_resources,
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.set_resources = noop_set_resources,
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.acpi_name = gpio_regulator_acpi_name,
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.acpi_fill_ssdt = gpio_regulator_fill_ssdt_generator,
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};
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static void gpio_regulator_enable(struct device *dev)
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{
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dev->ops = &gpio_regulator_ops;
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}
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struct chip_operations drivers_generic_gpio_regulator_ops = {
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CHIP_NAME("GPIO Regulator")
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.enable_dev = gpio_regulator_enable
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};
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