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Date: Sun, 1 Sep 2013 22:00:59 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>,
Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 2/4] regulator: add STw481x VMMC driver
The ST Microelectronics STw481x PMIC used for the Nomadik
has one single software-controlled regulator for VMMC.
This driver registers directly to the compatible string
as there is just one regulator.
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
Hi Mark, I'm seeking an ACK for this driver eventually, to
take it through the ARM SoC tree with the dependency MFD
driver and the enablement patches.
---
drivers/regulator/Kconfig | 8 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/stw481x-vmmc.c | 195 +++++++++++++++++++++++++++++++++++++++
3 files changed, 204 insertions(+)
create mode 100644 drivers/regulator/stw481x-vmmc.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index f1e6ad9..7e424fc 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -374,6 +374,14 @@ config REGULATOR_PALMAS
on the muxing. This is handled automatically in the driver by
reading the mux info from OTP.
+config REGULATOR_STW481X_VMMC
+ bool "ST Microelectronics STW481X VMMC regulator"
+ depends on MFD_STW481X
+ default y if MFD_STW481X
+ help
+ This driver supports the VMMC regulator in the STw481x
+ PMIC chips.
+
config REGULATOR_TPS51632
tristate "TI TPS51632 Power Regulator"
depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index ba4a3cf..6d53bd4 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o
obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
+obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o
obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
diff --git a/drivers/regulator/stw481x-vmmc.c b/drivers/regulator/stw481x-vmmc.c
new file mode 100644
index 0000000..e53916e
--- /dev/null
+++ b/drivers/regulator/stw481x-vmmc.c
@@ -0,0 +1,195 @@
+/*
+ * Regulator driver for STw4810/STw4811 VMMC regulator.
+ *
+ * Copyright (C) 2013 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@...aro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/mfd/stw481x.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+static int stw481x_vmmc_enable(struct regulator_dev *reg)
+{
+ struct stw481x *stw481x = rdev_get_drvdata(reg);
+ int ret;
+
+ /* First disable the external VMMC if it's active */
+ ret = regmap_update_bits(stw481x->map, STW_CONF2,
+ STW_CONF2_VMMC_EXT, 0);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(stw481x->map, STW_CONF1,
+ 0, STW_CONF1_PDN_VMMC);
+}
+
+static int stw481x_vmmc_disable(struct regulator_dev *reg)
+{
+ struct stw481x *stw481x = rdev_get_drvdata(reg);
+
+ return regmap_update_bits(stw481x->map, STW_CONF1,
+ STW_CONF1_PDN_VMMC, 0);
+}
+
+static int stw481x_vmmc_is_enabled(struct regulator_dev *reg)
+{
+ struct stw481x *stw481x = rdev_get_drvdata(reg);
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(stw481x->map, STW_CONF1, &val);
+ if (ret)
+ return ret;
+ return !!(val & STW_CONF1_PDN_VMMC);
+}
+
+static int stw481x_vmmc_get_voltage_sel(struct regulator_dev *reg)
+{
+ struct stw481x *stw481x = rdev_get_drvdata(reg);
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(stw481x->map, STW_CONF1, &val);
+ if (ret)
+ return ret;
+ val &= STW_CONF1_VMMC_MASK;
+ return (val >> 1);
+}
+
+static int stw481x_vmmc_set_voltage_sel(struct regulator_dev *reg,
+ unsigned selector)
+{
+ struct stw481x *stw481x = rdev_get_drvdata(reg);
+
+ return regmap_update_bits(stw481x->map, STW_CONF1,
+ STW_CONF1_VMMC_MASK,
+ (selector << 1) & STW_CONF1_VMMC_MASK);
+}
+
+static const unsigned int stw481x_vmmc_voltages[] = {
+ 1800000,
+ 1800000,
+ 2850000,
+ 3000000,
+ 1850000,
+ 2600000,
+ 2700000,
+ 3300000,
+};
+
+static struct regulator_ops stw481x_vmmc_ops = {
+ .list_voltage = regulator_list_voltage_table,
+ .enable = stw481x_vmmc_enable,
+ .disable = stw481x_vmmc_disable,
+ .is_enabled = stw481x_vmmc_is_enabled,
+ .get_voltage_sel = stw481x_vmmc_get_voltage_sel,
+ .set_voltage_sel = stw481x_vmmc_set_voltage_sel,
+};
+
+static struct regulator_desc vmmc_regulator = {
+ .name = "VMMC",
+ .id = 0,
+ .ops = &stw481x_vmmc_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
+ .volt_table = stw481x_vmmc_voltages,
+ .enable_time = 200, /* FIXME: look this up */
+};
+
+static ssize_t show_ctrl1(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int ret;
+ unsigned int val;
+ struct stw481x *stw481x = dev_get_platdata(dev);
+
+ ret = regmap_read(stw481x->map, STW_CONF1, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%#x\n", val);
+};
+
+static DEVICE_ATTR(ctrl1, S_IRUGO, show_ctrl1, NULL);
+
+static struct attribute *stw481x_vmmc_sysfs_entries[] = {
+ &dev_attr_ctrl1.attr,
+ NULL,
+};
+
+static struct attribute_group stw481x_vmmc_attr_group = {
+ .attrs = stw481x_vmmc_sysfs_entries,
+};
+
+static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
+{
+ struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
+ struct regulator_config config = { };
+ int ret;
+
+ /* Register VMMC regulator */
+ config.dev = &pdev->dev;
+ config.driver_data = stw481x;
+ config.of_node = pdev->dev.of_node;
+ config.init_data = of_get_regulator_init_data(&pdev->dev,
+ pdev->dev.of_node);
+
+ stw481x->vmmc_regulator = regulator_register(&vmmc_regulator, &config);
+ if (IS_ERR(stw481x->vmmc_regulator)) {
+ dev_err(&pdev->dev,
+ "error initializing STw481x VMMC regulator\n");
+ return PTR_ERR(stw481x->vmmc_regulator);
+ }
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &stw481x_vmmc_attr_group);
+ if (ret)
+ dev_err(&pdev->dev, "could not create sysfs group\n");
+
+ dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
+ return 0;
+}
+
+static int stw481x_vmmc_regulator_remove(struct platform_device *pdev)
+{
+ struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
+
+ regulator_unregister(stw481x->vmmc_regulator);
+ return 0;
+}
+
+static const struct of_device_id stw481x_vmmc_match[] = {
+ { .compatible = "st,stw481x-vmmc", },
+ {},
+};
+
+static struct platform_driver stw481x_vmmc_regulator_driver = {
+ .driver = {
+ .name = "stw481x-vmmc-regulator",
+ .owner = THIS_MODULE,
+ },
+ .probe = stw481x_vmmc_regulator_probe,
+ .remove = stw481x_vmmc_regulator_remove,
+};
+
+static __init int stw481x_vmmc_regulator_init(void)
+{
+ return platform_driver_register(&stw481x_vmmc_regulator_driver);
+}
+
+static __exit void stw481x_vmmc_regulator_exit(void)
+{
+ platform_driver_unregister(&stw481x_vmmc_regulator_driver);
+}
+
+subsys_initcall(stw481x_vmmc_regulator_init);
+module_exit(stw481x_vmmc_regulator_exit);
--
1.8.1.4
--
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