[U-Boot] [PATCH V2 09/13] sandbox: add: sandbox PMIC device drivers: I2C emul, pmic, regulator

Przemyslaw Marczak
2015-05-13T11:38:32Z

This commit adds emulation of sandbox PMIC device, which includes:
- PMIC I2C emulation driver
- PMIC I/O driver (UCLASS_PMIC)
- PMIC regulator driver (UCLASS_REGULATOR)

The sandbox PMIC has 12 significant registers and 4 as padding to 16 bytes,
which allows using 'i2c md' command with the default count (16).

The sandbox PMIC provides regulators:
- 2x BUCK
- 2x LDO

Each, with adjustable output:
- Enable state
- Voltage
- Current limit (LDO1/BUCK1 only)
- Operation mode (different for BUCK and LDO)

Each attribute has it's own register, beside the enable state, which depends
on operation mode.

The header file: sandbox_pmic.h includes PMIC's default register values,
which are set on i2c pmic emul driver's probe() method.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested on sandbox:
Tested-by: Simon Glass <sjg@chromium.org>
---
Changes V2:
- pmic emul driver: get the default register settings from fdt
- cleanup of sandbox_pmic.h
---
doc/device-tree-bindings/pmic/sandbox.txt | 35 +++
doc/device-tree-bindings/regulator/sandbox.txt | 45 ++++
drivers/power/pmic/Kconfig | 25 ++
drivers/power/pmic/Makefile | 3 +-
drivers/power/pmic/i2c_pmic_emul.c | 142 ++++++++++
drivers/power/pmic/sandbox.c | 79 ++++++
drivers/power/regulator/Kconfig | 30 +++
drivers/power/regulator/Makefile | 1 +
drivers/power/regulator/sandbox.c | 355 +++++++++++++++++++++++++
include/power/sandbox_pmic.h | 105 ++++++++
10 files changed, 819 insertions(+), 1 deletion(-)
create mode 100644 doc/device-tree-bindings/pmic/sandbox.txt
create mode 100644 doc/device-tree-bindings/regulator/sandbox.txt
create mode 100644 drivers/power/pmic/i2c_pmic_emul.c
create mode 100644 drivers/power/pmic/sandbox.c
create mode 100644 drivers/power/regulator/sandbox.c
create mode 100644 include/power/sandbox_pmic.h

diff --git a/doc/device-tree-bindings/pmic/sandbox.txt b/doc/device-tree-bindings/pmic/sandbox.txt
new file mode 100644
index 0000000..d84c977
--- /dev/null
+++ b/doc/device-tree-bindings/pmic/sandbox.txt
@@ -0,0 +1,35 @@
+Sandbox pmic
+
+This device uses two drivers:
+- drivers/power/pmic/sandbox.c (for parent device)
+- drivers/power/regulator/sandbox.c (for child regulators)
+
+This file describes the binding info for the PMIC driver.
+
+To bind the regulators, please read the regulator binding info:
+- doc/device-tree-bindings/regulator/sandbox.txt
+
+Required PMIC node properties:
+- compatible: "sandbox,pmic"
+- reg = 0x40
+
+Required PMIC's "emul" subnode, with property:
+- compatible: "sandbox,i2c-pmic"
+
+With the above properties, the pmic device can be used for read/write only.
+To bind each regulator, the optional regulator subnodes should exists.
+
+Optional subnodes:
+- ldo/buck subnodes of each device's regulator (see regulator binding info)
+
+Example:
+
+sandbox_pmic {
+ compatible = "sandbox,pmic";
+ reg = <0x40>;
+
+ /* Mandatory for I/O */
+ emul {
+ compatible = "sandbox,i2c-pmic";
+ };
+};
diff --git a/doc/device-tree-bindings/regulator/sandbox.txt b/doc/device-tree-bindings/regulator/sandbox.txt
new file mode 100644
index 0000000..d70494c
--- /dev/null
+++ b/doc/device-tree-bindings/regulator/sandbox.txt
@@ -0,0 +1,45 @@
+Sandbox, PMIC regulators
+
+This device uses two drivers:
+- drivers/power/pmic/sandbox.c (as parent I/O device)
+- drivers/power/regulator/sandbox.c (for child regulators)
+
+This file describes the binding info for the REGULATOR driver.
+
+First, please read the binding info for the PMIC:
+- doc/device-tree-bindings/pmic/sandbox.txt
+
+Required subnodes:
+- ldoN { };
+- buckN { };
+
+The sandbox PMIC can support: ldo1, ldo2, buck1, buck2.
+
+For each PMIC's regulator subnode, there is one required property:
+- regulator-name: used for regulator uclass platform data '.name'
+
+Optional:
+- regulator-min-microvolt: minimum allowed Voltage to set
+- regulator-max-microvolt: minimum allowed Voltage to set
+- regulator-min-microamps: minimum allowed Current limit to set (LDO1/BUCK1)
+- regulator-max-microamps: minimum allowed Current limit to set (LDO1/BUCK1)
+- regulator-always-on: regulator should be never disabled
+- regulator-boot-on: regulator should be enabled by the bootloader
+
+Example PMIC's regulator subnodes:
+
+ldo1 {
+ regulator-name = "VDD_1.0V";
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1200000>;
+ regulator-min-microamps = <100000>;
+ regulator-max-microamps = <400000>;
+ regulator-always-on;
+};
+
+buck2 {
+ regulator-name = "VDD_1.8V";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-boot-on;
+};
diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index d99d9e3..164f421 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -16,3 +16,28 @@ config DM_PMIC_MAX77686
---help---
This config enables implementation of driver-model pmic uclass features
for PMIC MAX77686. The driver implements read/write operations.
+
+config DM_PMIC_SANDBOX
+ bool "Enable Driver Model for emulated Sandbox PMIC "
+ depends on DM_PMIC
+ ---help---
+ Enable the driver for Sandbox PMIC emulation. The emulated PMIC device
+ depends on two drivers:
+ - sandbox PMIC I/O driver - implements dm pmic operations
+ - sandbox PMIC i2c emul driver - emulates the PMIC's I2C transmission
+
+ A detailed information can be found in header: '<power/sandbox_pmic.h>'
+
+ The Sandbox PMIC info:
+ * I/O interface:
+ - I2C chip address: 0x40
+ - first register address: 0x0
+ - register count: 0x10
+ * Adjustable outputs:
+ - 2x LDO
+ - 2x BUCK
+ - Each, with a different operating conditions (header).
+ * Reset values:
+ - set by i2c emul driver's probe() (defaults in header)
+
+ Driver binding info: doc/device-tree-bindings/pmic/sandbox.txt
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 8cb993d..ae86f04 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -6,12 +6,13 @@
#

obj-$(CONFIG_DM_PMIC) += pmic-uclass.o
+obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o
+obj-$(CONFIG_DM_PMIC_SANDBOX) += sandbox.o i2c_pmic_emul.o
obj-$(CONFIG_POWER_LTC3676) += pmic_ltc3676.o
obj-$(CONFIG_POWER_MAX8998) += pmic_max8998.o
obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
-obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o
obj-$(CONFIG_POWER_PFUZE100) += pmic_pfuze100.o
obj-$(CONFIG_POWER_TPS65090_I2C) += pmic_tps65090.o
obj-$(CONFIG_POWER_TPS65090_EC) += pmic_tps65090_ec.o
diff --git a/drivers/power/pmic/i2c_pmic_emul.c b/drivers/power/pmic/i2c_pmic_emul.c
new file mode 100644
index 0000000..aeab5c9
--- /dev/null
+++ b/drivers/power/pmic/i2c_pmic_emul.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics
+ * Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/sandbox_pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * struct sandbox_i2c_pmic_plat_data - platform data for the PMIC
+ *
+ * @rw_reg: PMICs register of the chip I/O transaction
+ * @reg: PMICs registers array
+ */
+struct sandbox_i2c_pmic_plat_data {
+ u8 rw_reg;
+ u8 reg[SANDBOX_PMIC_REG_COUNT];
+};
+
+static int sandbox_i2c_pmic_read_data(struct udevice *emul, uchar chip,
+ uchar *buffer, int len)
+{
+ struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
+
+ if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
+ error("Request exceeds PMIC register range! Max register: %#x",
+ SANDBOX_PMIC_REG_COUNT);
+ return -EFAULT;
+ }
+
+ debug("Read PMIC: %#x at register: %#x count: %d\n",
+ (unsigned)chip & 0xff, plat->rw_reg, len);
+
+ memcpy(buffer, &plat->reg[plat->rw_reg], len);
+
+ return 0;
+}
+
+static int sandbox_i2c_pmic_write_data(struct udevice *emul, uchar chip,
+ uchar *buffer, int len,
+ bool next_is_read)
+{
+ struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
+
+ /* Probe only */
+ if (!len)
+ return 0;
+
+ /* Set PMIC register for I/O */
+ plat->rw_reg = *buffer;
+
+ debug("Write PMIC: %#x at register: %#x count: %d\n",
+ (unsigned)chip & 0xff, plat->rw_reg, len);
+
+ /* For read operation, set (write) only chip reg */
+ if (next_is_read)
+ return 0;
+
+ buffer++;
+ len--;
+
+ if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
+ error("Request exceeds PMIC register range! Max register: %#x",
+ SANDBOX_PMIC_REG_COUNT);
+ }
+
+ memcpy(&plat->reg[plat->rw_reg], buffer, len);
+
+ return 0;
+}
+
+static int sandbox_i2c_pmic_xfer(struct udevice *emul, struct i2c_msg *msg,
+ int nmsgs)
+{
+ int ret = 0;
+
+ for (; nmsgs > 0; nmsgs--, msg++) {
+ bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD);
+ if (msg->flags & I2C_M_RD) {
+ ret = sandbox_i2c_pmic_read_data(emul, msg->addr,
+ msg->buf, msg->len);
+ } else {
+ ret = sandbox_i2c_pmic_write_data(emul, msg->addr,
+ msg->buf, msg->len,
+ next_is_read);
+ }
+
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+static int sandbox_i2c_pmic_ofdata_to_platdata(struct udevice *emul)
+{
+ struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
+ const u8 *reg_defaults;
+
+ debug("%s:%d Setting PMIC default registers\n", __func__, __LINE__);
+
+ reg_defaults = fdtdec_locate_byte_array(gd->fdt_blob, emul->of_offset,
+ "reg-defaults",
+ SANDBOX_PMIC_REG_COUNT);
+
+ if (!reg_defaults) {
+ error("Property \"reg-defaults\" not found for device: %s!",
+ emul->name);
+ return -EINVAL;
+ }
+
+ memcpy(&plat->reg, reg_defaults, SANDBOX_PMIC_REG_COUNT);
+
+ return 0;
+}
+
+struct dm_i2c_ops sandbox_i2c_pmic_emul_ops = {
+ .xfer = sandbox_i2c_pmic_xfer,
+};
+
+static const struct udevice_id sandbox_i2c_pmic_ids[] = {
+ { .compatible = "sandbox,i2c-pmic" },
+ { }
+};
+
+U_BOOT_DRIVER(sandbox_i2c_pmic_emul) = {
+ .name = "sandbox_i2c_pmic_emul",
+ .id = UCLASS_I2C_EMUL,
+ .of_match = sandbox_i2c_pmic_ids,
+ .ofdata_to_platdata = sandbox_i2c_pmic_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct sandbox_i2c_pmic_plat_data),
+ .ops = &sandbox_i2c_pmic_emul_ops,
+};
diff --git a/drivers/power/pmic/sandbox.c b/drivers/power/pmic/sandbox.c
new file mode 100644
index 0000000..3e56acd
--- /dev/null
+++ b/drivers/power/pmic/sandbox.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics
+ * Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <power/sandbox_pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct pmic_child_info pmic_children_info[] = {
+ { .prefix = SANDBOX_OF_LDO_PREFIX, .driver = SANDBOX_LDO_DRIVER },
+ { .prefix = SANDBOX_OF_BUCK_PREFIX, .driver = SANDBOX_BUCK_DRIVER },
+ { },
+};
+
+static int sandbox_pmic_reg_count(struct udevice *dev)
+{
+ return SANDBOX_PMIC_REG_COUNT;
+}
+
+static int sandbox_pmic_write(struct udevice *dev, uint reg,
+ const uint8_t *buff, int len)
+{
+ if (dm_i2c_write(dev, reg, buff, len)) {
+ error("write error to device: %p register: %#x!", dev, reg);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int sandbox_pmic_read(struct udevice *dev, uint reg,
+ uint8_t *buff, int len)
+{
+ if (dm_i2c_read(dev, reg, buff, len)) {
+ error("read error from device: %p register: %#x!", dev, reg);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int sandbox_pmic_bind(struct udevice *dev)
+{
+ if (!pmic_bind_children(dev, dev->of_offset, pmic_children_info))
+ error("%s:%d PMIC: %s - no child found!", __func__, __LINE__,
+ dev->name);
+
+ /* Always return success for this device - allows for PMIC I/O */
+ return 0;
+}
+
+static struct dm_pmic_ops sandbox_pmic_ops = {
+ .reg_count = sandbox_pmic_reg_count,
+ .read = sandbox_pmic_read,
+ .write = sandbox_pmic_write,
+};
+
+static const struct udevice_id sandbox_pmic_ids[] = {
+ { .compatible = "sandbox,pmic" },
+ { }
+};
+
+U_BOOT_DRIVER(sandbox_pmic) = {
+ .name = "sandbox_pmic",
+ .id = UCLASS_PMIC,
+ .of_match = sandbox_pmic_ids,
+ .bind = sandbox_pmic_bind,
+ .ops = &sandbox_pmic_ops,
+};
diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index fd3cf35..6289b83 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -31,3 +31,33 @@ config DM_REGULATOR_FIXED
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 DM_REGULATOR_SANDBOX
+ bool "Enable Driver Model for Sandbox PMIC regulator"
+ depends on DM_REGULATOR && DM_PMIC_SANDBOX
+ ---help---
+ Enable the regulator driver for emulated Sandbox PMIC.
+ The emulated PMIC device depends on two drivers:
+ - sandbox PMIC I/O driver - implements dm pmic operations
+ - sandbox PMIC regulator driver - implements dm regulator operations
+ - sandbox PMIC i2c emul driver - emulates the PMIC's I2C transmission
+
+ The regulator driver provides uclass operations for sandbox PMIC's
+ regulators. The driver implements get/set api for: voltage, current,
+ operation mode and enable state.
+ The driver supports LDO and BUCK regulators.
+
+ The Sandbox PMIC info:
+ * I/O interface:
+ - I2C chip address: 0x40
+ - first register address: 0x0
+ - register count: 0x10
+ * Adjustable outputs:
+ - 2x LDO
+ - 2x BUCK
+ - Each, with a different operating conditions (header).
+ * Reset values:
+ - set by i2c emul driver's probe() (defaults in header)
+
+ A detailed information can be found in header: '<power/sandbox_pmic.h>'
+ Binding info: 'doc/device-tree-bindings/pmic/max77686.txt'
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index cc8326d..96aa624 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -8,3 +8,4 @@
obj-$(CONFIG_DM_REGULATOR) += regulator-uclass.o
obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
obj-$(CONFIG_DM_REGULATOR_FIXED) += fixed.o
+obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o
diff --git a/drivers/power/regulator/sandbox.c b/drivers/power/regulator/sandbox.c
new file mode 100644
index 0000000..2cca579
--- /dev/null
+++ b/drivers/power/regulator/sandbox.c
@@ -0,0 +1,355 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics
+ * Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <power/sandbox_pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define MODE(_id, _val, _name) [_id] = { \
+ .id = _id, \
+ .register_value = _val, \
+ .name = _name, \
+}
+
+#define RANGE(_min, _max, _step) { \
+ .min = _min, \
+ .max = _max, \
+ .step = _step, \
+}
+
+/*
+ * struct output_range - helper structure type to define the range of output
+ * operating values (current/voltage), limited by the PMIC IC design.
+ *
+ * @min - minimum value
+ * @max - maximum value
+ * @step - step value
+*/
+struct output_range {
+ int min;
+ int max;
+ int step;
+};
+
+/* BUCK: 1,2 - voltage range */
+static struct output_range buck_voltage_range[] = {
+ RANGE(OUT_BUCK1_UV_MIN, OUT_BUCK1_UV_MAX, OUT_BUCK1_UV_STEP),
+ RANGE(OUT_BUCK2_UV_MIN, OUT_BUCK2_UV_MAX, OUT_BUCK2_UV_STEP),
+};
+
+/* BUCK: 1 - current range */
+static struct output_range buck_current_range[] = {
+ RANGE(OUT_BUCK1_UA_MIN, OUT_BUCK1_UA_MAX, OUT_BUCK1_UA_STEP),
+};
+
+/* BUCK operating modes */
+static struct dm_regulator_mode sandbox_buck_modes[] = {
+ MODE(BUCK_OM_OFF, OM2REG(BUCK_OM_OFF), "OFF"),
+ MODE(BUCK_OM_ON, OM2REG(BUCK_OM_ON), "ON"),
+ MODE(BUCK_OM_PWM, OM2REG(BUCK_OM_PWM), "PWM"),
+};
+
+/* LDO: 1,2 - voltage range */
+static struct output_range ldo_voltage_range[] = {
+ RANGE(OUT_LDO1_UV_MIN, OUT_LDO1_UV_MAX, OUT_LDO1_UV_STEP),
+ RANGE(OUT_LDO2_UV_MIN, OUT_LDO2_UV_MAX, OUT_LDO2_UV_STEP),
+};
+
+/* LDO: 1 - current range */
+static struct output_range ldo_current_range[] = {
+ RANGE(OUT_LDO1_UA_MIN, OUT_LDO1_UA_MAX, OUT_LDO1_UA_STEP),
+};
+
+/* LDO operating modes */
+static struct dm_regulator_mode sandbox_ldo_modes[] = {
+ MODE(LDO_OM_OFF, OM2REG(LDO_OM_OFF), "OFF"),
+ MODE(LDO_OM_ON, OM2REG(LDO_OM_ON), "ON"),
+ MODE(LDO_OM_SLEEP, OM2REG(LDO_OM_SLEEP), "SLEEP"),
+ MODE(LDO_OM_STANDBY, OM2REG(LDO_OM_STANDBY), "STANDBY"),
+};
+
+int out_get_value(struct udevice *dev, int output_count, int reg_type,
+ struct output_range *range)
+{
+ uint8_t reg_val;
+ uint reg;
+ int ret;
+
+ if (dev->driver_data > output_count) {
+ error("Unknown regulator number: %lu for PMIC %s!",
+ dev->driver_data, dev->name);
+ return -EINVAL;
+ }
+
+ reg = (dev->driver_data - 1) * OUT_REG_COUNT + reg_type;
+ ret = pmic_read(dev->parent, reg, &reg_val, 1);
+ if (ret) {
+ error("PMIC read failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = REG2VAL(range[dev->driver_data - 1].min,
+ range[dev->driver_data - 1].step,
+ reg_val);
+
+ return ret;
+}
+
+static int out_set_value(struct udevice *dev, int output_count, int reg_type,
+ struct output_range *range, int value)
+{
+ uint8_t reg_val;
+ uint reg;
+ int ret;
+ int max_value;
+
+ if (dev->driver_data > output_count) {
+ error("Unknown regulator number: %lu for PMIC %s!",
+ dev->driver_data, dev->name);
+ return -EINVAL;
+ }
+
+ max_value = range[dev->driver_data - 1].max;
+ if (value > max_value) {
+ error("Wrong value for %s: %lu. Max is: %d.",
+ dev->name, dev->driver_data, max_value);
+ return -EINVAL;
+ }
+
+ reg_val = VAL2REG(range[dev->driver_data - 1].min,
+ range[dev->driver_data - 1].step,
+ value);
+
+ reg = (dev->driver_data - 1) * OUT_REG_COUNT + reg_type;
+ ret = pmic_write(dev->parent, reg, &reg_val, 1);
+ if (ret) {
+ error("PMIC write failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int out_get_mode(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+ uint8_t reg_val;
+ uint reg;
+ int ret;
+ int i;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+
+ reg = (dev->driver_data - 1) * OUT_REG_COUNT + OUT_REG_OM;
+ ret = pmic_read(dev->parent, reg, &reg_val, 1);
+ if (ret) {
+ error("PMIC read failed: %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0; i < uc_pdata->mode_count; i++) {
+ if (reg_val == uc_pdata->mode[i].register_value)
+ return uc_pdata->mode[i].id;
+ }
+
+ error("Unknown operation mode for %s!", dev->name);
+ return -EINVAL;
+}
+
+static int out_set_mode(struct udevice *dev, int mode)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+ int reg_val = -1;
+ uint reg;
+ int ret;
+ int i;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+
+ if (mode >= uc_pdata->mode_count)
+ return -EINVAL;
+
+ for (i = 0; i < uc_pdata->mode_count; i++) {
+ if (mode == uc_pdata->mode[i].id) {
+ reg_val = uc_pdata->mode[i].register_value;
+ break;
+ }
+ }
+
+ if (reg_val == -1) {
+ error("Unknown operation mode for %s!", dev->name);
+ return -EINVAL;
+ }
+
+ reg = (dev->driver_data - 1) * OUT_REG_COUNT + OUT_REG_OM;
+ ret = pmic_write(dev->parent, reg, (uint8_t *)&reg_val, 1);
+ if (ret) {
+ error("PMIC write failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int buck_get_voltage(struct udevice *dev)
+{
+ return out_get_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UV,
+ buck_voltage_range);
+}
+
+static int buck_set_voltage(struct udevice *dev, int uV)
+{
+ return out_set_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UV,
+ buck_voltage_range, uV);
+}
+
+static int buck_get_current(struct udevice *dev)
+{
+ /* BUCK2 - unsupported */
+ if (dev->driver_data == 2)
+ return -ENOSYS;
+
+ return out_get_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UA,
+ buck_current_range);
+}
+
+static int buck_set_current(struct udevice *dev, int uA)
+{
+ /* BUCK2 - unsupported */
+ if (dev->driver_data == 2)
+ return -ENOSYS;
+
+ return out_set_value(dev, SANDBOX_BUCK_COUNT, OUT_REG_UA,
+ buck_current_range, uA);
+}
+
+static bool buck_get_enable(struct udevice *dev)
+{
+ if (out_get_mode(dev) == BUCK_OM_OFF)
+ return false;
+
+ return true;
+}
+
+static int buck_set_enable(struct udevice *dev, bool enable)
+{
+ return out_set_mode(dev, enable ? BUCK_OM_ON : BUCK_OM_OFF);
+}
+
+static int sandbox_buck_probe(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+
+ uc_pdata->type = REGULATOR_TYPE_BUCK;
+ uc_pdata->mode = sandbox_buck_modes;
+ uc_pdata->mode_count = ARRAY_SIZE(sandbox_buck_modes);
+
+ return 0;
+}
+
+static const struct dm_regulator_ops sandbox_buck_ops = {
+ .get_value = buck_get_voltage,
+ .set_value = buck_set_voltage,
+ .get_current = buck_get_current,
+ .set_current = buck_set_current,
+ .get_enable = buck_get_enable,
+ .set_enable = buck_set_enable,
+ .get_mode = out_get_mode,
+ .set_mode = out_set_mode,
+};
+
+U_BOOT_DRIVER(sandbox_buck) = {
+ .name = SANDBOX_BUCK_DRIVER,
+ .id = UCLASS_REGULATOR,
+ .ops = &sandbox_buck_ops,
+ .probe = sandbox_buck_probe,
+};
+
+static int ldo_get_voltage(struct udevice *dev)
+{
+ return out_get_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UV,
+ ldo_voltage_range);
+}
+
+static int ldo_set_voltage(struct udevice *dev, int uV)
+{
+ return out_set_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UV,
+ ldo_voltage_range, uV);
+}
+
+static int ldo_get_current(struct udevice *dev)
+{
+ /* LDO2 - unsupported */
+ if (dev->driver_data == 2)
+ return -ENOSYS;
+
+ return out_get_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UA,
+ ldo_current_range);
+}
+
+static int ldo_set_current(struct udevice *dev, int uA)
+{
+ /* LDO2 - unsupported */
+ if (dev->driver_data == 2)
+ return -ENOSYS;
+
+ return out_set_value(dev, SANDBOX_LDO_COUNT, OUT_REG_UA,
+ ldo_current_range, uA);
+}
+
+static bool ldo_get_enable(struct udevice *dev)
+{
+ if (out_get_mode(dev) == LDO_OM_OFF)
+ return false;
+
+ return true;
+}
+
+static int ldo_set_enable(struct udevice *dev, bool enable)
+{
+ return out_set_mode(dev, enable ? LDO_OM_ON : LDO_OM_OFF);
+}
+
+static int sandbox_ldo_probe(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+
+ uc_pdata->type = REGULATOR_TYPE_LDO;
+ uc_pdata->mode = sandbox_ldo_modes;
+ uc_pdata->mode_count = ARRAY_SIZE(sandbox_ldo_modes);
+
+ return 0;
+}
+
+static const struct dm_regulator_ops sandbox_ldo_ops = {
+ .get_value = ldo_get_voltage,
+ .set_value = ldo_set_voltage,
+ .get_current = ldo_get_current,
+ .set_current = ldo_set_current,
+ .get_enable = ldo_get_enable,
+ .set_enable = ldo_set_enable,
+ .get_mode = out_get_mode,
+ .set_mode = out_set_mode,
+};
+
+U_BOOT_DRIVER(sandbox_ldo) = {
+ .name = SANDBOX_LDO_DRIVER,
+ .id = UCLASS_REGULATOR,
+ .ops = &sandbox_ldo_ops,
+ .probe = sandbox_ldo_probe,
+};
diff --git a/include/power/sandbox_pmic.h b/include/power/sandbox_pmic.h
new file mode 100644
index 0000000..f317c3a
--- /dev/null
+++ b/include/power/sandbox_pmic.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics
+ * Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _SANDBOX_PMIC_H_
+#define _SANDBOX_PMIC_H_
+
+#define SANDBOX_LDO_DRIVER "sandbox_ldo"
+#define SANDBOX_OF_LDO_PREFIX "ldo"
+#define SANDBOX_BUCK_DRIVER "sandbox_buck"
+#define SANDBOX_OF_BUCK_PREFIX "buck"
+
+#define SANDBOX_BUCK_COUNT 2
+#define SANDBOX_LDO_COUNT 2
+/*
+ * Sandbox PMIC registers:
+ * We have only 12 significant registers, but we alloc 16 for padding.
+ */
+enum {
+ SANDBOX_PMIC_REG_BUCK1_UV = 0,
+ SANDBOX_PMIC_REG_BUCK1_UA,
+ SANDBOX_PMIC_REG_BUCK1_OM,
+
+ SANDBOX_PMIC_REG_BUCK2_UV,
+ SANDBOX_PMIC_REG_BUCK2_UA,
+ SANDBOX_PMIC_REG_BUCK2_OM,
+
+ SANDBOX_PMIC_REG_LDO_OFFSET,
+ SANDBOX_PMIC_REG_LDO1_UV = SANDBOX_PMIC_REG_LDO_OFFSET,
+ SANDBOX_PMIC_REG_LDO1_UA,
+ SANDBOX_PMIC_REG_LDO1_OM,
+
+ SANDBOX_PMIC_REG_LDO2_UV,
+ SANDBOX_PMIC_REG_LDO2_UA,
+ SANDBOX_PMIC_REG_LDO2_OM,
+
+ SANDBOX_PMIC_REG_COUNT = 16,
+};
+
+/* Register offset for output: micro Volts, micro Amps, Operation Mode */
+enum {
+ OUT_REG_UV = 0,
+ OUT_REG_UA,
+ OUT_REG_OM,
+ OUT_REG_COUNT,
+};
+
+/* Buck operation modes */
+enum {
+ BUCK_OM_OFF = 0,
+ BUCK_OM_ON,
+ BUCK_OM_PWM,
+ BUCK_OM_COUNT,
+};
+
+/* Ldo operation modes */
+enum {
+ LDO_OM_OFF = 0,
+ LDO_OM_ON,
+ LDO_OM_SLEEP,
+ LDO_OM_STANDBY,
+ LDO_OM_COUNT,
+};
+
+/* BUCK1 Voltage: min: 0.8V, step: 25mV, max 2.4V */
+#define OUT_BUCK1_UV_MIN 800000
+#define OUT_BUCK1_UV_MAX 2400000
+#define OUT_BUCK1_UV_STEP 25000
+
+/* BUCK1 Amperage: min: 150mA, step: 25mA, max: 250mA */
+#define OUT_BUCK1_UA_MIN 150000
+#define OUT_BUCK1_UA_MAX 250000
+#define OUT_BUCK1_UA_STEP 25000
+
+/* BUCK2 Voltage: min: 0.75V, step: 50mV, max 3.95V */
+#define OUT_BUCK2_UV_MIN 750000
+#define OUT_BUCK2_UV_MAX 3950000
+#define OUT_BUCK2_UV_STEP 50000
+
+/* LDO1 Voltage: min: 0.8V, step: 25mV, max 2.4V */
+#define OUT_LDO1_UV_MIN 800000
+#define OUT_LDO1_UV_MAX 2400000
+#define OUT_LDO1_UV_STEP 25000
+
+/* LDO1 Amperage: min: 100mA, step: 50mA, max: 200mA */
+#define OUT_LDO1_UA_MIN 100000
+#define OUT_LDO1_UA_MAX 200000
+#define OUT_LDO1_UA_STEP 50000
+
+/* LDO2 Voltage: min: 0.75V, step: 50mV, max 3.95V */
+#define OUT_LDO2_UV_MIN 750000
+#define OUT_LDO2_UV_MAX 3950000
+#define OUT_LDO2_UV_STEP 50000
+
+/* register <-> value conversion */
+#define REG2VAL(min, step, reg) ((min) + ((step) * (reg)))
+#define VAL2REG(min, step, val) (((val) - (min)) / (step))
+
+/* Operation mode id -> register value conversion */
+#define OM2REG(x) (x)
+
+#endif
--
1.9.1