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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>
This commit is contained in:
Furquan Shaikh 2020-07-01 01:26:22 -07:00
parent 8cdb0b3767
commit 8c88ceca57
4 changed files with 0 additions and 97 deletions
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5
src/drivers/generic/gpio_regulator/Kconfig
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# SPDX-License-Identifier: GPL-2.0-only
config DRIVERS_GENERIC_GPIO_REGULATOR
bool
depends on HAVE_ACPI_TABLES

3
src/drivers/generic/gpio_regulator/Makefile.inc
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# SPDX-License-Identifier: GPL-2.0-only
ramstage-$(CONFIG_DRIVERS_GENERIC_GPIO_REGULATOR) += gpio_regulator.c

14
src/drivers/generic/gpio_regulator/chip.h
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@ -1,14 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __DRIVERS_GENERIC_GPIO_REGULATOR_H__
#define __DRIVERS_GENERIC_GPIO_REGULATOR_H__
#include <acpi/acpi_device.h>
struct drivers_generic_gpio_regulator_config {
const char *name;
struct acpi_gpio gpio;
bool enabled_on_boot;
};
#endif /* __DRIVERS_GENERIC_GPIO_REGULATOR_H__ */

75
src/drivers/generic/gpio_regulator/gpio_regulator.c
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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <device/device.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
static void gpio_regulator_fill_ssdt_generator(const struct device *dev)
{
struct drivers_generic_gpio_regulator_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
const char *path = acpi_device_path(dev);
struct acpi_dp *dsd;
if (!dev->enabled || !scope || !path || !config->gpio.pin_count)
return;
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
/* _HID is set to PRP0001 */
acpigen_write_name_string("_HID", ACPI_DT_NAMESPACE_HID);
/* Resources - _CRS */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_gpio(&config->gpio);
acpigen_write_resourcetemplate_footer();
/* DSD */
dsd = acpi_dp_new_table("_DSD");
acpi_dp_add_string(dsd, "compatible", "regulator-fixed");
acpi_dp_add_string(dsd, "regulator-name", config->name);
acpi_dp_add_gpio(dsd, "gpio-gpios", path, 0, 0, config->gpio.polarity);
if (config->enabled_on_boot)
acpi_dp_add_string(dsd, "regulator-boot-on", "on");
if (config->gpio.polarity == ACPI_GPIO_ACTIVE_HIGH)
acpi_dp_add_string(dsd, "enable-active-high", "on");
acpi_dp_write(dsd);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
}
static const char *gpio_regulator_acpi_name(const struct device *dev)
{
struct drivers_generic_gpio_regulator_config *config = dev->chip_info;
static char name[5];
snprintf(name, sizeof(name), "R%03.3X", config->gpio.pins[0]);
name[4] = '\0';
return name;
}
static struct device_operations gpio_regulator_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.acpi_name = gpio_regulator_acpi_name,
.acpi_fill_ssdt = gpio_regulator_fill_ssdt_generator,
};
static void gpio_regulator_enable(struct device *dev)
{
dev->ops = &gpio_regulator_ops;
}
struct chip_operations drivers_generic_gpio_regulator_ops = {
CHIP_NAME("GPIO Regulator")
.enable_dev = gpio_regulator_enable
};