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178 lines
4.6 KiB
Diff
178 lines
4.6 KiB
Diff
From 4444a1c10069e2f371fa497ba22feafafed5aada Mon Sep 17 00:00:00 2001
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From: Markus Reichl <m.reichl@fivetechno.de>
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Date: Mon, 6 Jan 2020 22:16:24 +0100
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Subject: [PATCH] regulator: mp8859: add driver
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The MP8859 from Monolithic Power Systems is a single output DC/DC
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converter. The voltage can be controlled via I2C.
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Signed-off-by: Markus Reichl <m.reichl@fivetechno.de>
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Link: https://lore.kernel.org/r/20200106211633.2882-2-m.reichl@fivetechno.de
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Signed-off-by: Mark Brown <broonie@kernel.org>
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---
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drivers/regulator/mp8859.c | 156 +++++++++++++++++++++++++++++++++++++
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1 file changed, 156 insertions(+)
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create mode 100644 drivers/regulator/mp8859.c
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diff --git a/drivers/regulator/mp8859.c b/drivers/regulator/mp8859.c
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new file mode 100644
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index 0000000000000..e804a52673017
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--- /dev/null
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+++ b/drivers/regulator/mp8859.c
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@@ -0,0 +1,156 @@
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+// SPDX-License-Identifier: GPL-2.0
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+//
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+// Copyright (c) 2019 five technologies GmbH
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+// Author: Markus Reichl <m.reichl@fivetechno.de>
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+
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+#include <linux/module.h>
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+#include <linux/i2c.h>
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+#include <linux/of.h>
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+#include <linux/regulator/driver.h>
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+#include <linux/regmap.h>
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+
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+
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+#define VOL_MIN_IDX 0x00
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+#define VOL_MAX_IDX 0x7ff
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+
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+/* Register definitions */
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+#define MP8859_VOUT_L_REG 0 //3 lo Bits
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+#define MP8859_VOUT_H_REG 1 //8 hi Bits
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+#define MP8859_VOUT_GO_REG 2
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+#define MP8859_IOUT_LIM_REG 3
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+#define MP8859_CTL1_REG 4
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+#define MP8859_CTL2_REG 5
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+#define MP8859_RESERVED1_REG 6
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+#define MP8859_RESERVED2_REG 7
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+#define MP8859_RESERVED3_REG 8
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+#define MP8859_STATUS_REG 9
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+#define MP8859_INTERRUPT_REG 0x0A
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+#define MP8859_MASK_REG 0x0B
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+#define MP8859_ID1_REG 0x0C
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+#define MP8859_MFR_ID_REG 0x27
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+#define MP8859_DEV_ID_REG 0x28
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+#define MP8859_IC_REV_REG 0x29
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+
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+#define MP8859_MAX_REG 0x29
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+
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+#define MP8859_GO_BIT 0x01
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+
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+
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+static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
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+{
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+ int ret;
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+
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+ ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7);
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+
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+ if (ret)
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+ return ret;
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+ ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3);
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+
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+ if (ret)
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+ return ret;
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+ ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG,
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+ MP8859_GO_BIT, 1);
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+ return ret;
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+}
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+
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+static int mp8859_get_voltage_sel(struct regulator_dev *rdev)
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+{
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+ unsigned int val_tmp;
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+ unsigned int val;
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+ int ret;
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+
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+ ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp);
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+
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+ if (ret)
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+ return ret;
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+ val = val_tmp << 3;
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+
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+ ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp);
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+
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+ if (ret)
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+ return ret;
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+ val |= val_tmp & 0x07;
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+ return val;
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+}
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+
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+static const struct regulator_linear_range mp8859_dcdc_ranges[] = {
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+ REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
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+};
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+
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+static const struct regmap_config mp8859_regmap = {
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+ .reg_bits = 8,
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+ .val_bits = 8,
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+ .max_register = MP8859_MAX_REG,
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+ .cache_type = REGCACHE_RBTREE,
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+};
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+
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+static const struct regulator_ops mp8859_ops = {
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+ .set_voltage_sel = mp8859_set_voltage_sel,
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+ .get_voltage_sel = mp8859_get_voltage_sel,
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+ .list_voltage = regulator_list_voltage_linear_range,
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+};
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+
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+static const struct regulator_desc mp8859_regulators[] = {
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+ {
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+ .id = 0,
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+ .type = REGULATOR_VOLTAGE,
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+ .name = "mp8859_dcdc",
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+ .of_match = of_match_ptr("mp8859_dcdc"),
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+ .n_voltages = VOL_MAX_IDX + 1,
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+ .linear_ranges = mp8859_dcdc_ranges,
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+ .n_linear_ranges = 1,
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+ .ops = &mp8859_ops,
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int mp8859_i2c_probe(struct i2c_client *i2c)
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+{
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+ int ret;
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+ struct regulator_config config = {.dev = &i2c->dev};
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+ struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap);
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+ struct regulator_dev *rdev;
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+
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+ if (IS_ERR(regmap)) {
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+ ret = PTR_ERR(regmap);
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+ dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
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+ return ret;
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+ }
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+ rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0],
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+ &config);
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+
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+ if (IS_ERR(rdev)) {
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+ ret = PTR_ERR(rdev);
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+ dev_err(&i2c->dev, "failed to register %s: %d\n",
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+ mp8859_regulators[0].name, ret);
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+ return ret;
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+ }
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+ return 0;
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+}
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+
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+static const struct of_device_id mp8859_dt_id[] = {
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+ {.compatible = "mps,mp8859"},
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, mp8859_dt_id);
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+
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+static const struct i2c_device_id mp8859_i2c_id[] = {
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+ { "mp8859", },
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+ { },
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+};
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+MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);
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+
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+static struct i2c_driver mp8859_regulator_driver = {
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+ .driver = {
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+ .name = "mp8859",
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+ .of_match_table = of_match_ptr(mp8859_dt_id),
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+ },
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+ .probe_new = mp8859_i2c_probe,
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+ .id_table = mp8859_i2c_id,
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+};
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+
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+module_i2c_driver(mp8859_regulator_driver);
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+
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+MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
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+MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
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+MODULE_LICENSE("GPL v2");
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