mfd: Add HI6421 PMIC Core driver

This adds driver to support HiSilicon Hi6421 PMIC. Hi6421 includes multi-
functions, such as regulators, codec, ADCs, Coulomb counter, etc.
This driver includes core APIs _only_.

Drivers for individul components, like voltage regulators, are
implemented in corresponding driver directories and files.

Registers in Hi6421 are memory mapped, so using regmap-mmio API.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Guodong Xu 2014-09-01 16:28:34 +08:00 committed by Lee Jones
parent 0709b048ce
commit 8bdf87b400
4 changed files with 168 additions and 0 deletions

View file

@ -210,6 +210,19 @@ config MFD_MC13XXX_I2C
help
Select this if your MC13xxx is connected via an I2C bus.
config MFD_HI6421_PMIC
tristate "HiSilicon Hi6421 PMU/Codec IC"
depends on OF
select MFD_CORE
select REGMAP_MMIO
help
Add support for HiSilicon Hi6421 PMIC. Hi6421 includes multi-
functions, such as regulators, RTC, codec, Coulomb counter, etc.
This driver includes core APIs _only_. You have to select
individul components like voltage regulators under corresponding
menus in order to enable them.
We communicate with the Hi6421 via memory-mapped I/O.
config HTC_EGPIO
bool "HTC EGPIO support"
depends on GPIOLIB && ARM

View file

@ -172,6 +172,7 @@ obj-$(CONFIG_MFD_AS3722) += as3722.o
obj-$(CONFIG_MFD_STW481X) += stw481x.o
obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o

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@ -0,0 +1,113 @@
/*
* Device driver for Hi6421 IC
*
* Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
* http://www.hisilicon.com
* Copyright (c) <2013-2014> Linaro Ltd.
* http://www.linaro.org
*
* Author: Guodong Xu <guodong.xu@linaro.org>
*
* 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 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/hi6421-pmic.h>
static const struct mfd_cell hi6421_devs[] = {
{ .name = "hi6421-regulator", },
};
static struct regmap_config hi6421_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 8,
.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
};
static int hi6421_pmic_probe(struct platform_device *pdev)
{
struct hi6421_pmic *pmic;
struct resource *res;
void __iomem *base;
int ret;
pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
if (!pmic)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
&hi6421_regmap_config);
if (IS_ERR(pmic->regmap)) {
dev_err(&pdev->dev,
"regmap init failed: %ld\n", PTR_ERR(pmic->regmap));
return PTR_ERR(pmic->regmap);
}
/* set over-current protection debounce 8ms */
regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
(HI6421_OCP_DEB_SEL_MASK
| HI6421_OCP_EN_DEBOUNCE_MASK
| HI6421_OCP_AUTO_STOP_MASK),
(HI6421_OCP_DEB_SEL_8MS
| HI6421_OCP_EN_DEBOUNCE_ENABLE));
platform_set_drvdata(pdev, pmic);
ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs,
ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);
if (ret) {
dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
return ret;
}
return 0;
}
static int hi6421_pmic_remove(struct platform_device *pdev)
{
mfd_remove_devices(&pdev->dev);
return 0;
}
static struct of_device_id of_hi6421_pmic_match_tbl[] = {
{ .compatible = "hisilicon,hi6421-pmic", },
{ },
};
static struct platform_driver hi6421_pmic_driver = {
.driver = {
.name = "hi6421_pmic",
.of_match_table = of_hi6421_pmic_match_tbl,
},
.probe = hi6421_pmic_probe,
.remove = hi6421_pmic_remove,
};
module_platform_driver(hi6421_pmic_driver);
MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
MODULE_DESCRIPTION("Hi6421 PMIC driver");
MODULE_LICENSE("GPL v2");

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@ -0,0 +1,41 @@
/*
* Header file for device driver Hi6421 PMIC
*
* Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
* http://www.hisilicon.com
* Copyright (c) <2013-2014> Linaro Ltd.
* http://www.linaro.org
*
* Author: Guodong Xu <guodong.xu@linaro.org>
*
* 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.
*/
#ifndef __HI6421_PMIC_H
#define __HI6421_PMIC_H
/* Hi6421 registers are mapped to memory bus in 4 bytes stride */
#define HI6421_REG_TO_BUS_ADDR(x) (x << 2)
/* Hi6421 maximum register number */
#define HI6421_REG_MAX 0xFF
/* Hi6421 OCP (over current protection) and DEB (debounce) control register */
#define HI6421_OCP_DEB_CTRL_REG HI6421_REG_TO_BUS_ADDR(0x51)
#define HI6421_OCP_DEB_SEL_MASK 0x0C
#define HI6421_OCP_DEB_SEL_8MS 0x00
#define HI6421_OCP_DEB_SEL_16MS 0x04
#define HI6421_OCP_DEB_SEL_32MS 0x08
#define HI6421_OCP_DEB_SEL_64MS 0x0C
#define HI6421_OCP_EN_DEBOUNCE_MASK 0x02
#define HI6421_OCP_EN_DEBOUNCE_ENABLE 0x02
#define HI6421_OCP_AUTO_STOP_MASK 0x01
#define HI6421_OCP_AUTO_STOP_ENABLE 0x01
struct hi6421_pmic {
struct regmap *regmap;
};
#endif /* __HI6421_PMIC_H */