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    Subject[PATCH v10] Regulator: Add Anatop regulator driver
    Date
    From: "Ying-Chun Liu (PaulLiu)" <paul.liu@linaro.org>

    Anatop is an integrated regulator inside i.MX6 SoC.
    There are 3 digital regulators which controls PU, CORE (ARM), and SOC.
    And 3 analog regulators which controls 1P1, 2P5, 3P0 (USB).
    This patch adds the Anatop regulator driver.

    Signed-off-by: Nancy Chen <Nancy.Chen@freescale.com>
    Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
    Acked-by: Shawn Guo <shawn.guo@linaro.org>
    Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
    Cc: Liam Girdwood <lrg@ti.com>
    Cc: Samuel Ortiz <sameo@linux.intel.com>
    Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
    Cc: Axel Lin <axel.lin@gmail.com>
    ---
    .../bindings/regulator/anatop-regulator.txt | 28 +++
    drivers/regulator/Kconfig | 8 +
    drivers/regulator/Makefile | 1 +
    drivers/regulator/anatop-regulator.c | 236 ++++++++++++++++++++
    4 files changed, 273 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/devicetree/bindings/regulator/anatop-regulator.txt
    create mode 100644 drivers/regulator/anatop-regulator.c

    diff --git a/Documentation/devicetree/bindings/regulator/anatop-regulator.txt b/Documentation/devicetree/bindings/regulator/anatop-regulator.txt
    new file mode 100644
    index 0000000..73363e76
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/regulator/anatop-regulator.txt
    @@ -0,0 +1,28 @@
    +Anatop Voltage regulators
    +
    +Required properties:
    +- compatible: Must be "fsl,anatop-regulator"
    +- anatop-vol-bit-shift: Bit shift for the register
    +- anatop-vol-bit-width: Number of bits used in the register
    +- anatop-min-bit-val: Minimum value of this register
    +- anatop-min-voltage: Minimum voltage of this regulator
    +- anatop-max-voltage: Maximum voltage of this regulator
    +
    +Any property defined as part of the core regulator
    +binding, defined in regulator.txt, can also be used.
    +
    +Example:
    +
    + reg_vddpu: regulator-vddpu@140 {
    + compatible = "fsl,anatop-regulator";
    + regulator-name = "vddpu";
    + regulator-min-microvolt = <725000>;
    + regulator-max-microvolt = <1300000>;
    + regulator-always-on;
    + reg = <0x140>;
    + anatop-vol-bit-shift = <9>;
    + anatop-vol-bit-width = <5>;
    + anatop-min-bit-val = <1>;
    + anatop-min-voltage = <725000>;
    + anatop-max-voltage = <1300000>;
    + };
    diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
    index 7a61b17..3857209 100644
    --- a/drivers/regulator/Kconfig
    +++ b/drivers/regulator/Kconfig
    @@ -213,6 +213,14 @@ config REGULATOR_PCAP
    This driver provides support for the voltage regulators of the
    PCAP2 PMIC.

    +config REGULATOR_ANATOP
    + tristate "Freescale i.MX on-chip ANATOP LDO regulators"
    + depends on MFD_ANATOP
    + help
    + Say y here to support Freescale i.MX on-chip ANATOP LDOs
    + regulators. It is recommended that this option be
    + enabled on i.MX6 platform.
    +
    config REGULATOR_MC13XXX_CORE
    tristate

    diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
    index 503bac8..8440871 100644
    --- a/drivers/regulator/Makefile
    +++ b/drivers/regulator/Makefile
    @@ -48,5 +48,6 @@ obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
    obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
    obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
    obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
    +obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o

    ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
    diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
    new file mode 100644
    index 0000000..133a17b
    --- /dev/null
    +++ b/drivers/regulator/anatop-regulator.c
    @@ -0,0 +1,236 @@
    +/*
    + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
    + */
    +
    +/*
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    +
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    +
    + * You should have received a copy of the GNU General Public License along
    + * with this program; if not, write to the Free Software Foundation, Inc.,
    + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    + */
    +
    +#include <linux/slab.h>
    +#include <linux/device.h>
    +#include <linux/module.h>
    +#include <linux/err.h>
    +#include <linux/io.h>
    +#include <linux/platform_device.h>
    +#include <linux/of.h>
    +#include <linux/of_address.h>
    +#include <linux/mfd/anatop.h>
    +#include <linux/regulator/driver.h>
    +#include <linux/regulator/of_regulator.h>
    +
    +struct anatop_regulator {
    + const char *name;
    + u32 control_reg;
    + struct anatop *mfd;
    + int vol_bit_shift;
    + int vol_bit_width;
    + int min_bit_val;
    + int min_voltage;
    + int max_voltage;
    + struct regulator_desc rdesc;
    + struct regulator_init_data *initdata;
    +};
    +
    +static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
    + int max_uV, unsigned *selector)
    +{
    + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
    + u32 val, sel;
    + int uv;
    +
    + uv = min_uV;
    + dev_dbg(&reg->dev, "%s: uv %d, min %d, max %d\n", __func__,
    + uv, anatop_reg->min_voltage,
    + anatop_reg->max_voltage);
    +
    + if (uv < anatop_reg->min_voltage) {
    + if (max_uV > anatop_reg->min_voltage)
    + uv = anatop_reg->min_voltage;
    + else
    + return -EINVAL;
    + }
    +
    + if (anatop_reg->control_reg) {
    + sel = (uv - anatop_reg->min_voltage) / 25000;
    + if (sel * 25000 + anatop_reg->min_voltage
    + > anatop_reg->max_voltage)
    + return -EINVAL;
    + val = anatop_reg->min_bit_val + sel;
    + *selector = sel;
    + dev_dbg(&reg->dev, "%s: calculated val %d\n", __func__, val);
    + anatop_set_bits(anatop_reg->mfd,
    + anatop_reg->control_reg,
    + anatop_reg->vol_bit_shift,
    + anatop_reg->vol_bit_width,
    + val);
    + return 0;
    + } else {
    + return -ENOTSUPP;
    + }
    +}
    +
    +static int anatop_get_voltage_sel(struct regulator_dev *reg)
    +{
    + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
    + int selector;
    +
    + if (anatop_reg->control_reg) {
    + u32 val = anatop_get_bits(anatop_reg->mfd,
    + anatop_reg->control_reg,
    + anatop_reg->vol_bit_shift,
    + anatop_reg->vol_bit_width);
    + selector = val - anatop_reg->min_bit_val;
    + return selector;
    + } else {
    + return -ENOTSUPP;
    + }
    +}
    +
    +static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)
    +{
    + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
    + int uv;
    +
    + uv = anatop_reg->min_voltage + selector * 25000;
    + dev_dbg(&reg->dev, "vddio = %d, selector = %u\n", uv, selector);
    +
    + return uv;
    +}
    +
    +static struct regulator_ops anatop_rops = {
    + .set_voltage = anatop_set_voltage,
    + .get_voltage_sel = anatop_get_voltage_sel,
    + .list_voltage = anatop_list_voltage,
    +};
    +
    +static int __devinit anatop_regulator_probe(struct platform_device *pdev)
    +{
    + struct device *dev = &pdev->dev;
    + struct device_node *np = dev->of_node;
    + struct regulator_desc *rdesc;
    + struct regulator_dev *rdev;
    + struct anatop_regulator *sreg;
    + struct regulator_init_data *initdata;
    + struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);
    + int ret = 0;
    +
    + initdata = of_get_regulator_init_data(dev, np);
    + sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
    + if (!sreg)
    + return -ENOMEM;
    + sreg->initdata = initdata;
    + sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
    + GFP_KERNEL);
    + rdesc = &sreg->rdesc;
    + memset(rdesc, 0, sizeof(*rdesc));
    + rdesc->name = sreg->name;
    + rdesc->ops = &anatop_rops;
    + rdesc->type = REGULATOR_VOLTAGE;
    + rdesc->owner = THIS_MODULE;
    + sreg->mfd = anatopmfd;
    + if (of_property_read_u32(np, "reg", &sreg->control_reg)) {
    + dev_err(&pdev->dev, "no reg property set\n");
    + ret = -ENODEV;
    + goto anatop_probe_end;
    + }
    + if (of_property_read_u32(np, "anatop-vol-bit-width",
    + &sreg->vol_bit_width)) {
    + dev_err(&pdev->dev, "no anatop-vol-bit-width property set\n");
    + ret = -ENODEV;
    + goto anatop_probe_end;
    + }
    + if (of_property_read_u32(np, "anatop-vol-bit-shift",
    + &sreg->vol_bit_shift)) {
    + dev_err(&pdev->dev, "no anatop-vol-bit-shift property set\n");
    + ret = -ENODEV;
    + goto anatop_probe_end;
    + }
    + if (of_property_read_u32(np, "anatop-min-bit-val",
    + &sreg->min_bit_val)) {
    + dev_err(&pdev->dev, "no anatop-min-bit-val property set\n");
    + ret = -ENODEV;
    + goto anatop_probe_end;
    + }
    + if (of_property_read_u32(np, "anatop-min-voltage",
    + &sreg->min_voltage)) {
    + dev_err(&pdev->dev, "no anatop-min-voltage property set\n");
    + ret = -ENODEV;
    + goto anatop_probe_end;
    + }
    + if (of_property_read_u32(np, "anatop-max-voltage",
    + &sreg->max_voltage)) {
    + dev_err(&pdev->dev, "no anatop-max-voltage property set\n");
    + ret = -ENODEV;
    + goto anatop_probe_end;
    + }
    +
    + /* register regulator */
    + rdev = regulator_register(rdesc, &pdev->dev,
    + initdata, sreg, pdev->dev.of_node);
    + if (IS_ERR(rdev)) {
    + dev_err(&pdev->dev, "failed to register %s\n",
    + rdesc->name);
    + ret = PTR_ERR(rdev);
    + goto anatop_probe_end;
    + }
    +
    + platform_set_drvdata(pdev, rdev);
    +
    +anatop_probe_end:
    + if (ret != 0 && sreg->name)
    + kfree(sreg->name);
    + return ret;
    +}
    +
    +static int __devexit anatop_regulator_remove(struct platform_device *pdev)
    +{
    + struct regulator_dev *rdev = platform_get_drvdata(pdev);
    + struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
    + kfree(sreg->name);
    + regulator_unregister(rdev);
    + return 0;
    +}
    +
    +static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
    + { .compatible = "fsl,anatop-regulator", },
    + { /* end */ }
    +};
    +
    +static struct platform_driver anatop_regulator = {
    + .driver = {
    + .name = "anatop_regulator",
    + .owner = THIS_MODULE,
    + .of_match_table = of_anatop_regulator_match_tbl,
    + },
    + .probe = anatop_regulator_probe,
    + .remove = anatop_regulator_remove,
    +};
    +
    +static int __init anatop_regulator_init(void)
    +{
    + return platform_driver_register(&anatop_regulator);
    +}
    +postcore_initcall(anatop_regulator_init);
    +
    +static void __exit anatop_regulator_exit(void)
    +{
    + platform_driver_unregister(&anatop_regulator);
    +}
    +module_exit(anatop_regulator_exit);
    +
    +MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
    + "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
    +MODULE_DESCRIPTION("ANATOP Regulator driver");
    +MODULE_LICENSE("GPL v2");
    --
    1.7.9.1


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