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>

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 049796a282159b58443a289d56e054da6411bf5e..609b7a2144d6f77316ec58bd9fbe1f26dca1e689 100644 (file)
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -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

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index bd111213bd58b5a944a993212856f32d06ba6ea3..1d11a247abbba44aefb450148f751b4a250111fd 100644 (file)
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -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

diff --git a/drivers/mfd/hi6421-pmic-core.c b/drivers/mfd/hi6421-pmic-core.c
new file mode 100644 (file)
index 0000000..321a265
--- /dev/null
+++ b/drivers/mfd/hi6421-pmic-core.c
@@ -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");

diff --git a/include/linux/mfd/hi6421-pmic.h b/include/linux/mfd/hi6421-pmic.h
new file mode 100644 (file)
index 0000000..587273e
--- /dev/null
+++ b/include/linux/mfd/hi6421-pmic.h
@@ -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 */