From mboxrd@z Thu Jan 1 00:00:00 1970 From: pawel.moll@arm.com (Pawel Moll) Date: Mon, 3 Sep 2012 17:25:27 +0100 Subject: [PATCH 07/11] regulators: Versatile Express regulator driver In-Reply-To: <1346689531-7212-1-git-send-email-pawel.moll@arm.com> References: <1346689531-7212-1-git-send-email-pawel.moll@arm.com> Message-ID: <1346689531-7212-8-git-send-email-pawel.moll@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Implementation of the regulator framework driver for the Versatile Express voltage control. Devices without voltage constraints (ie. "regulator-[min|max]-microvolt" properties in the DT node) are treated as fixed (or rather read-only) regulators. Signed-off-by: Pawel Moll --- drivers/regulator/Kconfig | 7 ++ drivers/regulator/Makefile | 1 + drivers/regulator/vexpress.c | 144 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 152 insertions(+) create mode 100644 drivers/regulator/vexpress.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 4e932cc..7642773 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -404,6 +404,13 @@ config REGULATOR_TWL4030 This driver supports the voltage regulators provided by this family of companion chips. +config REGULATOR_VEXPRESS + tristate "Versatile Express regulators" + depends on VEXPRESS_CONFIG_BUS + help + This driver provides support for voltage regulators available + on the ARM Ltd's Versatile Express platform. + config REGULATOR_WM831X tristate "Wolfson Microelectronics WM831x PMIC regulators" depends on MFD_WM831X diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 3342615..0d4e10f 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -55,6 +55,7 @@ obj-$(CONFIG_REGULATOR_TPS6586X) += tps6586x-regulator.o obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o obj-$(CONFIG_REGULATOR_TPS65912) += tps65912-regulator.o obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o +obj-$(CONFIG_REGULATOR_VEXPRESS) += vexpress.o obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o diff --git a/drivers/regulator/vexpress.c b/drivers/regulator/vexpress.c new file mode 100644 index 0000000..c659b2e --- /dev/null +++ b/drivers/regulator/vexpress.c @@ -0,0 +1,144 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. + * + * Copyright (C) 2012 ARM Limited + */ + +#define DRVNAME "vexpress-regulator" +#define pr_fmt(fmt) DRVNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +struct vexpress_regulator { + struct regulator_desc desc; + struct regulator_dev *regdev; + struct vexpress_config_device *vecdev; +}; + +static int vexpress_regulator_get_voltage(struct regulator_dev *regdev) +{ + struct vexpress_regulator *reg = rdev_get_drvdata(regdev); + u32 uV; + int err = vexpress_config_read(reg->vecdev, 0, &uV); + + return err ? err : uV; +} + +static int vexpress_regulator_set_voltage(struct regulator_dev *regdev, + int min_uV, int max_uV, unsigned *selector) +{ + struct vexpress_regulator *reg = rdev_get_drvdata(regdev); + + return vexpress_config_write(reg->vecdev, 0, min_uV); +} + +static struct regulator_ops vexpress_regulator_ops_ro = { + .get_voltage = vexpress_regulator_get_voltage, +}; + +static struct regulator_ops vexpress_regulator_ops = { + .get_voltage = vexpress_regulator_get_voltage, + .set_voltage = vexpress_regulator_set_voltage, +}; + +static int vexpress_regulator_probe(struct vexpress_config_device *vecdev) +{ + struct vexpress_regulator *reg; + struct regulator_init_data *init_data; + struct regulator_config config = { }; + + reg = devm_kzalloc(&vecdev->dev, sizeof(*reg), GFP_KERNEL); + if (!reg) + return -ENOMEM; + + reg->vecdev = vecdev; + + reg->desc.name = dev_name(&vecdev->dev); + reg->desc.type = REGULATOR_VOLTAGE; + reg->desc.owner = THIS_MODULE; + + init_data = of_get_regulator_init_data(&vecdev->dev, + vecdev->dev.of_node); + if (!init_data) { + dev_err(&vecdev->dev, "Failed to get regulator data!\n"); + return -EINVAL; + } + + init_data->constraints.apply_uV = 0; + if (init_data->constraints.min_uV && init_data->constraints.max_uV) + reg->desc.ops = &vexpress_regulator_ops; + else + reg->desc.ops = &vexpress_regulator_ops_ro; + + config.dev = &vecdev->dev; + config.init_data = init_data; + config.driver_data = reg; + config.of_node = vecdev->dev.of_node; + + reg->regdev = regulator_register(®->desc, &config); + if (IS_ERR(reg->regdev)) { + dev_err(&vecdev->dev, "Failed to register regulator! (%ld)\n", + PTR_ERR(reg->regdev)); + return PTR_ERR(reg->regdev); + } + + vexpress_config_set_drvdata(vecdev, reg); + + return 0; +} + +static int __devexit vexpress_regulator_remove(struct vexpress_config_device + *vecdev) +{ + struct vexpress_regulator *reg = vexpress_config_get_drvdata(vecdev); + + regulator_unregister(reg->regdev); + + return 0; +} + +static const unsigned vexpress_regulator_funcs[] = { + VEXPRESS_CONFIG_FUNC_VOLT, + 0, +}; + +static struct vexpress_config_driver vexpress_regulator_driver = { + .funcs = vexpress_regulator_funcs, + .probe = vexpress_regulator_probe, + .remove = __devexit_p(vexpress_regulator_remove), + .driver = { + .name = DRVNAME, + .owner = THIS_MODULE, + }, +}; + +static int __init vexpress_regulator_init(void) +{ + return vexpress_config_driver_register(&vexpress_regulator_driver); +} + +static void __exit vexpress_regulator_exit(void) +{ + vexpress_config_driver_unregister(&vexpress_regulator_driver); +} + +MODULE_AUTHOR("Pawel Moll "); +MODULE_DESCRIPTION("Versatile Express regulator"); +MODULE_LICENSE("GPL"); + +module_init(vexpress_regulator_init); +module_exit(vexpress_regulator_exit); -- 1.7.9.5