GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/power/regulator/gpio-regulator.c

@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
+ * Keerthy <j-keerthy@ti.com>
+ */
+
+#include "regulator_common.h"
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <asm/gpio.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+#define GPIO_REGULATOR_MAX_STATES	2
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct gpio_regulator_platdata {
+	struct regulator_common_platdata common;
+	struct gpio_desc gpio; /* GPIO for regulator voltage control */
+	int states[GPIO_REGULATOR_MAX_STATES];
+	int voltages[GPIO_REGULATOR_MAX_STATES];
+};
+
+static int gpio_regulator_ofdata_to_platdata(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct gpio_regulator_platdata *dev_pdata;
+	struct gpio_desc *gpio;
+	const void *blob = gd->fdt_blob;
+	int node = dev_of_offset(dev);
+	int ret, count, i, j;
+	u32 states_array[8];
+
+	dev_pdata = dev_get_platdata(dev);
+	uc_pdata = dev_get_uclass_platdata(dev);
+	if (!uc_pdata)
+		return -ENXIO;
+
+	/* Set type to gpio */
+	uc_pdata->type = REGULATOR_TYPE_GPIO;
+
+	/*
+	 * Get gpio regulator gpio desc
+	 * Assuming one GPIO per regulator.
+	 * Can be extended later to multiple GPIOs
+	 * per gpio-regulator. As of now no instance with multiple
+	 * gpios is presnt
+	 */
+	gpio = &dev_pdata->gpio;
+	ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
+	if (ret)
+		debug("regulator gpio - not found! Error: %d", ret);
+
+	count = fdtdec_get_int_array_count(blob, node, "states",
+					   states_array, 8);
+
+	if (!count)
+		return -EINVAL;
+
+	for (i = 0, j = 0; i < count; i += 2) {
+		dev_pdata->voltages[j] = states_array[i];
+		dev_pdata->states[j] = states_array[i + 1];
+		j++;
+	}
+
+	return regulator_common_ofdata_to_platdata(dev, &dev_pdata->common, "enable-gpios");
+}
+
+static int gpio_regulator_get_value(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
+	int enable;
+
+	if (!dev_pdata->gpio.dev)
+		return -ENOSYS;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+	if (uc_pdata->min_uV > uc_pdata->max_uV) {
+		debug("Invalid constraints for: %s\n", uc_pdata->name);
+		return -EINVAL;
+	}
+
+	enable = dm_gpio_get_value(&dev_pdata->gpio);
+	if (enable == dev_pdata->states[0])
+		return dev_pdata->voltages[0];
+	else
+		return dev_pdata->voltages[1];
+}
+
+static int gpio_regulator_set_value(struct udevice *dev, int uV)
+{
+	struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
+	int ret;
+	bool enable;
+
+	if (!dev_pdata->gpio.dev)
+		return -ENOSYS;
+
+	if (uV == dev_pdata->voltages[0])
+		enable = dev_pdata->states[0];
+	else if (uV == dev_pdata->voltages[1])
+		enable = dev_pdata->states[1];
+	else
+		return -EINVAL;
+
+	ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
+	if (ret) {
+		pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
+		      enable);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int gpio_regulator_get_enable(struct udevice *dev)
+{
+	struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
+	return regulator_common_get_enable(dev, &dev_pdata->common);
+}
+
+static int gpio_regulator_set_enable(struct udevice *dev, bool enable)
+{
+	struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
+	return regulator_common_set_enable(dev, &dev_pdata->common, enable);
+}
+
+static const struct dm_regulator_ops gpio_regulator_ops = {
+	.get_value	= gpio_regulator_get_value,
+	.set_value	= gpio_regulator_set_value,
+	.get_enable	= gpio_regulator_get_enable,
+	.set_enable	= gpio_regulator_set_enable,
+};
+
+static const struct udevice_id gpio_regulator_ids[] = {
+	{ .compatible = "regulator-gpio" },
+	{ },
+};
+
+U_BOOT_DRIVER(gpio_regulator) = {
+	.name = "gpio regulator",
+	.id = UCLASS_REGULATOR,
+	.ops = &gpio_regulator_ops,
+	.of_match = gpio_regulator_ids,
+	.ofdata_to_platdata = gpio_regulator_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata),
+};