[U-Boot] [PATCH v3 12/17] dm: regulator: add fixed voltage regulator driver

Przemyslaw Marczak
2015-03-24T20:30:46Z

This driver implements regulator uclass features for fixed value regulators.
For getting the basic regulator device-tree node constraints, this driver calls
function 'regulator_ofdata_to_platdata()'. The typical fixed regulator node
provides few additional properties:
- gpio
- gpio-open-drain
- enable-active-high
- startup-delay-us
All above are checked and keept in structure of type 'fixed_regulator_priv',
which is private for each fixed-regulator device (dev->priv).

The driver implements only three of regulator uclass features:
- get_value
- get_enable
- set_enable

The regulator calls and command line features can be used for fixed-regulator,
and the proper error will be returned for prohibited.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>

Changes v3:
- new file
- Kconfig add fixed-regulator entry
---
drivers/power/Kconfig | 8 +++
drivers/power/regulator/Makefile | 1 +
drivers/power/regulator/fixed.c | 124 +++++++++++++++++++++++++++++++++++++++
3 files changed, 133 insertions(+)
create mode 100644 drivers/power/regulator/fixed.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 97abbf0..da1e866 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -120,6 +120,14 @@ config DM_REGULATOR_MAX77686
features for REGULATOR MAX77686. The driver implements get/set api for:
value, enable and mode.

+config DM_REGULATOR_FIXED
+ bool "Enable Driver Model for REGULATOR Fixed value"
+ depends on DM_REGULATOR
+ ---help---
+ This config enables implementation of driver-model regulator uclass
+ features for fixed value regulators. The driver implements get/set api
+ for enable and get only for voltage value.
+
config AXP221_DCDC1_VOLT
int "axp221 dcdc1 voltage"
depends on AXP221_POWER
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index 9d282e3..0a6a6d9 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -5,4 +5,5 @@
# SPDX-License-Identifier: GPL-2.0+
#

+obj-$(CONFIG_DM_REGULATOR_FIXED) += fixed.o
obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
diff --git a/drivers/power/regulator/fixed.c b/drivers/power/regulator/fixed.c
new file mode 100644
index 0000000..45e9f84
--- /dev/null
+++ b/drivers/power/regulator/fixed.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics
+ *
+ * Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <dm.h>
+#include <asm/gpio.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <errno.h>
+#include <dm.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct fixed_regulator_priv {
+ struct gpio_desc gpio;
+ bool gpio_open_drain;
+ bool enable_active_high;
+ unsigned startup_delay_us;
+};
+
+static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
+{
+ struct dm_regulator_info *info = dev->uclass_priv;
+ struct fixed_regulator_priv *priv = dev->priv;
+ int ret, offset = dev->of_offset;
+
+ /* Get the basic regulator constraints */
+ ret = regulator_ofdata_to_platdata(dev);
+ if (ret) {
+ error("Can't get regulator constraints for %s", dev->name);
+ return ret;
+ }
+
+ /* Get fixed regulator gpio desc */
+ ret = gpio_request_by_name_nodev(gd->fdt_blob, offset, "gpio", 0,
+ &priv->gpio, GPIOD_IS_OUT);
+ if (ret) {
+ error("Fixed regulator gpio - not found! Error: %d", ret);
+ return ret;
+ }
+
+ /* Get fixed regulator addidional constraints */
+ priv->gpio_open_drain = fdtdec_get_bool(gd->fdt_blob, offset,
+ "gpio-open-drain");
+ priv->enable_active_high = fdtdec_get_bool(gd->fdt_blob, offset,
+ "enable-active-high");
+ priv->startup_delay_us = fdtdec_get_int(gd->fdt_blob, offset,
+ "startup-delay-us", 0);
+
+ /* Set type to fixed - used by regulator command */
+ info->type = REGULATOR_TYPE_FIXED;
+
+ debug("%s:%d\n", __func__, __LINE__);
+ debug(" name:%s, boot_on:%d, active_hi: %d start_delay:%u\n",
+ info->name, info->boot_on, priv->enable_active_high,
+ priv->startup_delay_us);
+
+ return 0;
+}
+
+static int fixed_regulator_get_value(struct udevice *dev)
+{
+ struct dm_regulator_info *info;
+ int ret;
+
+ ret = regulator_info(dev, &info);
+ if (ret)
+ return ret;
+
+ if (info->min_uV == info->max_uV)
+ return info->min_uV;
+
+ error("Invalid constraints for: %s\n", info->name);
+
+ return -EINVAL;
+}
+
+static bool fixed_regulator_get_enable(struct udevice *dev)
+{
+ struct fixed_regulator_priv *priv = dev->priv;
+
+ return dm_gpio_get_value(&priv->gpio);
+}
+
+static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
+{
+ struct fixed_regulator_priv *priv = dev->priv;
+ int ret;
+
+ ret = dm_gpio_set_value(&priv->gpio, enable);
+ if (ret) {
+ error("Can't set regulator : %s gpio to: %d\n", dev->name,
+ enable);
+ return ret;
+ }
+ return 0;
+}
+
+static const struct dm_regulator_ops fixed_regulator_ops = {
+ .get_value = fixed_regulator_get_value,
+ .get_enable = fixed_regulator_get_enable,
+ .set_enable = fixed_regulator_set_enable,
+};
+
+static const struct udevice_id fixed_regulator_ids[] = {
+ { .compatible = "regulator-fixed" },
+ { },
+};
+
+U_BOOT_DRIVER(fixed_regulator) = {
+ .name = "fixed regulator",
+ .id = UCLASS_REGULATOR,
+ .ops = &fixed_regulator_ops,
+ .of_match = fixed_regulator_ids,
+ .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
+ .priv_auto_alloc_size = sizeof(struct fixed_regulator_priv),
+};
--
1.9.1