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authorAlexander Monakov <amonakov@ispras.ru>2018-03-09 01:53:03 +0300
committerMark Brown <broonie@kernel.org>2018-03-09 13:01:17 +0000
commita265b03bd29a745d85237f47739d92cb43d214b9 (patch)
treea3ab11bd3ba9e31137ff79da413c1ebc4b059c7f
parent2a254de29e995ea58d73f75b69016cf913a5447d (diff)
downloadtalos-obmc-linux-a265b03bd29a745d85237f47739d92cb43d214b9.tar.gz
talos-obmc-linux-a265b03bd29a745d85237f47739d92cb43d214b9.zip
regulator: 88pg86x: new i2c dual regulator chip
This chip is found on Google Chromecast and Valve Steam Link devices. It provides two DC regulators with I2C voltage control, separate GPIO enable pins and one sleep mode pin. This driver does not expose GPIO functionality, but supports voltage control in 1.0-2.2V range, based on I2C register information given in Chromecast kernel driver by Jisheng Zhang. Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com> Signed-off-by: Alexander Monakov <amonakov@ispras.ru> Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r--drivers/regulator/88pg86x.c114
-rw-r--r--drivers/regulator/Kconfig9
-rw-r--r--drivers/regulator/Makefile1
3 files changed, 124 insertions, 0 deletions
diff --git a/drivers/regulator/88pg86x.c b/drivers/regulator/88pg86x.c
new file mode 100644
index 000000000000..d5ef55c81185
--- /dev/null
+++ b/drivers/regulator/88pg86x.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/regulator/driver.h>
+#include <linux/regmap.h>
+
+static const struct regulator_ops pg86x_ops = {
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear_range,
+};
+
+static const struct regulator_linear_range pg86x_buck1_ranges[] = {
+ REGULATOR_LINEAR_RANGE( 0, 0, 10, 0),
+ REGULATOR_LINEAR_RANGE(1000000, 11, 34, 25000),
+ REGULATOR_LINEAR_RANGE(1600000, 35, 47, 50000),
+};
+
+static const struct regulator_linear_range pg86x_buck2_ranges[] = {
+ REGULATOR_LINEAR_RANGE( 0, 0, 15, 0),
+ REGULATOR_LINEAR_RANGE(1000000, 16, 39, 25000),
+ REGULATOR_LINEAR_RANGE(1600000, 40, 52, 50000),
+};
+
+static const struct regulator_desc pg86x_regulators[] = {
+ {
+ .id = 0,
+ .type = REGULATOR_VOLTAGE,
+ .name = "buck1",
+ .of_match = of_match_ptr("buck1"),
+ .n_voltages = 11 + 24 + 13,
+ .linear_ranges = pg86x_buck1_ranges,
+ .n_linear_ranges = 3,
+ .vsel_reg = 0x24,
+ .vsel_mask = 0xff,
+ .ops = &pg86x_ops,
+ .owner = THIS_MODULE
+ },
+ {
+ .id = 1,
+ .type = REGULATOR_VOLTAGE,
+ .name = "buck2",
+ .of_match = of_match_ptr("buck2"),
+ .n_voltages = 16 + 24 + 13,
+ .linear_ranges = pg86x_buck2_ranges,
+ .n_linear_ranges = 3,
+ .vsel_reg = 0x13,
+ .vsel_mask = 0xff,
+ .ops = &pg86x_ops,
+ .owner = THIS_MODULE
+ },
+};
+
+static const struct regmap_config pg86x_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int pg86x_i2c_probe(struct i2c_client *i2c)
+{
+ int id, ret;
+ struct regulator_config config = {.dev = &i2c->dev};
+ struct regmap *regmap = devm_regmap_init_i2c(i2c, &pg86x_regmap);
+
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
+ return ret;
+ }
+
+ for (id = 0; id < ARRAY_SIZE(pg86x_regulators); id++) {
+ struct regulator_dev *rdev;
+ rdev = devm_regulator_register(&i2c->dev,
+ &pg86x_regulators[id],
+ &config);
+ if (IS_ERR(rdev)) {
+ ret = PTR_ERR(rdev);
+ dev_err(&i2c->dev, "failed to register %s: %d\n",
+ pg86x_regulators[id].name, ret);
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static const struct of_device_id pg86x_dt_ids [] = {
+ { .compatible = "marvell,88pg867" },
+ { .compatible = "marvell,88pg868" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pg86x_dt_ids);
+
+static const struct i2c_device_id pg86x_i2c_id[] = {
+ { "88pg867", },
+ { "88pg868", },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pg86x_i2c_id);
+
+static struct i2c_driver pg86x_regulator_driver = {
+ .driver = {
+ .name = "88pg86x",
+ .of_match_table = of_match_ptr(pg86x_dt_ids),
+ },
+ .probe_new = pg86x_i2c_probe,
+ .id_table = pg86x_i2c_id,
+};
+
+module_i2c_driver(pg86x_regulator_driver);
+
+MODULE_DESCRIPTION("Marvell 88PG86X voltage regulator");
+MODULE_AUTHOR("Alexander Monakov <amonakov@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index b27417ca188a..097f61784a7d 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -54,6 +54,15 @@ config REGULATOR_USERSPACE_CONSUMER
If unsure, say no.
+config REGULATOR_88PG86X
+ tristate "Marvell 88PG86X voltage regulators"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ This driver supports Marvell 88PG867 and 88PG868 voltage regulators.
+ They provide two I2C-controlled DC/DC step-down converters with
+ sleep mode and separate enable pins.
+
config REGULATOR_88PM800
tristate "Marvell 88PM800 Power regulators"
depends on MFD_88PM800
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 19fea09ba10a..590674fbecd7 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
+obj-$(CONFIG_REGULATOR_88PG86X) += 88pg86x.o
obj-$(CONFIG_REGULATOR_88PM800) += 88pm800.o
obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
obj-$(CONFIG_REGULATOR_CPCAP) += cpcap-regulator.o
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