[PATCH v11] Regulator: Add Anatop regulator driver
Ying-Chun Liu (PaulLiu)
paul.liu at linaro.org
Fri Mar 9 02:57:09 EST 2012
From: "Ying-Chun Liu (PaulLiu)" <paul.liu at 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 at freescale.com>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu at linaro.org>
Acked-by: Shawn Guo <shawn.guo at linaro.org>
Cc: Mark Brown <broonie at opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg at ti.com>
Cc: Samuel Ortiz <sameo at linux.intel.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
Cc: Axel Lin <axel.lin at gmail.com>
---
drivers/regulator/Kconfig | 8 +
drivers/regulator/Makefile | 1 +
drivers/regulator/anatop-regulator.c | 238 ++++++++++++++++++++++++++++++++++
3 files changed, 247 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/anatop-regulator.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index c733df5..a229de9 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -102,6 +102,14 @@ config REGULATOR_DA9052
This driver supports the voltage regulators of DA9052-BC and
DA9053-AA/Bx 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 2b09c81..b5042c8 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
+obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
new file mode 100644
index 0000000..53a2d87
--- /dev/null
+++ b/drivers/regulator/anatop-regulator.c
@@ -0,0 +1,238 @@
+/*
+ * 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(®->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)
+ return -ENOTSUPP;
+
+ sel = DIV_ROUND_UP(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(®->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;
+}
+
+static int anatop_get_voltage_sel(struct regulator_dev *reg)
+{
+ struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
+ u32 val;
+
+ if (!anatop_reg->control_reg)
+ return -ENOTSUPP;
+
+ val = anatop_get_bits(anatop_reg->mfd,
+ anatop_reg->control_reg,
+ anatop_reg->vol_bit_shift,
+ anatop_reg->vol_bit_width);
+
+ return val - anatop_reg->min_bit_val;
+}
+
+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(®->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;
+ ret = of_property_read_u32(np, "reg", &sreg->control_reg);
+ if (ret) {
+ dev_err(dev, "no reg property set\n");
+ goto anatop_probe_end;
+ }
+ ret = of_property_read_u32(np, "anatop-vol-bit-width",
+ &sreg->vol_bit_width);
+ if (ret) {
+ dev_err(dev, "no anatop-vol-bit-width property set\n");
+ goto anatop_probe_end;
+ }
+ ret = of_property_read_u32(np, "anatop-vol-bit-shift",
+ &sreg->vol_bit_shift);
+ if (ret) {
+ dev_err(dev, "no anatop-vol-bit-shift property set\n");
+ goto anatop_probe_end;
+ }
+ ret = of_property_read_u32(np, "anatop-min-bit-val",
+ &sreg->min_bit_val);
+ if (ret) {
+ dev_err(dev, "no anatop-min-bit-val property set\n");
+ goto anatop_probe_end;
+ }
+ ret = of_property_read_u32(np, "anatop-min-voltage",
+ &sreg->min_voltage);
+ if (ret) {
+ dev_err(dev, "no anatop-min-voltage property set\n");
+ goto anatop_probe_end;
+ }
+ ret = of_property_read_u32(np, "anatop-max-voltage",
+ &sreg->max_voltage);
+ if (ret) {
+ dev_err(dev, "no anatop-max-voltage property set\n");
+ goto anatop_probe_end;
+ }
+
+ /* register regulator */
+ rdev = regulator_register(rdesc, dev,
+ initdata, sreg, pdev->dev.of_node);
+ if (IS_ERR(rdev)) {
+ dev_err(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)
+ 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);
+ const char *name = sreg->name;
+
+ regulator_unregister(rdev);
+ kfree(name);
+
+ 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 at freescale.com>, "
+ "Ying-Chun Liu (PaulLiu) <paul.liu at linaro.org>");
+MODULE_DESCRIPTION("ANATOP Regulator driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.1
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