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 --- .../bindings/regulator/anatop-regulator.txt | 28 +++ drivers/regulator/Kconfig | 8 + drivers/regulator/Makefile | 1 + drivers/regulator/anatop-regulator.c | 231 ++++++++++++++++++++ 4 files changed, 268 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..500463e --- /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" +- vol-bit-shift: Bit shift for the register +- vol-bit-width: Number of bits used in the register +- min-bit-val: Minimum value of this register +- min-voltage: Minimum voltage of this regulator +- 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>; + vol-bit-shift = <9>; + vol-bit-width = <5>; + min-bit-val = <1>; + min-voltage = <725000>; + max-voltage = <1300000>; + }; diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 7a61b17..5366991 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -335,5 +335,13 @@ config REGULATOR_AAT2870 If you have a AnalogicTech AAT2870 say Y to enable the regulator driver.

+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. + endif

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..1e20690 --- /dev/null +++ b/drivers/regulator/anatop-regulator.c @@ -0,0 +1,231 @@ +/* + * 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, "vol-bit-width", &sreg->vol_bit_width)) { + dev_err(&pdev->dev, "no vol-bit-width property set\n"); + ret = -ENODEV; + goto anatop_probe_end; + } + if (of_property_read_u32(np, "vol-bit-shift", &sreg->vol_bit_shift)) { + dev_err(&pdev->dev, "no vol-bit-shift property set\n"); + ret = -ENODEV; + goto anatop_probe_end; + } + if (of_property_read_u32(np, "min-bit-val", &sreg->min_bit_val)) { + dev_err(&pdev->dev, "no min-bit-val property set\n"); + ret = -ENODEV; + goto anatop_probe_end; + } + if (of_property_read_u32(np, "min-voltage", &sreg->min_voltage)) { + dev_err(&pdev->dev, "no min-voltage property set\n"); + ret = -ENODEV; + goto anatop_probe_end; + } + if (of_property_read_u32(np, "max-voltage", &sreg->max_voltage)) { + dev_err(&pdev->dev, "no 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");