[PATCH 2/3] mfd: Add hi6421 PMIC core driver

From: Guodong Xu
Date: Mon Aug 25 2014 - 09:41:28 EST

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@xxxxxxxxxx>
---
drivers/mfd/Kconfig | 13 +++++
drivers/mfd/Makefile | 1 +
drivers/mfd/hi6421-pmic-core.c | 112 ++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/hi6421-pmic.h | 42 +++++++++++++++
4 files changed, 168 insertions(+)
create mode 100644 drivers/mfd/hi6421-pmic-core.c
create mode 100644 include/linux/mfd/hi6421-pmic.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index de5abf2..2de4919 100644
--- 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 f001487..dc59efd 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,6 +169,7 @@ obj-$(CONFIG_MFD_AS3711) += as3711.o
obj-$(CONFIG_MFD_AS3722) += as3722.o
obj-$(CONFIG_MFD_STW481X) += stw481x.o
obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.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
index 0000000..c6cba8f
--- /dev/null
+++ b/drivers/mfd/hi6421-pmic-core.c
@@ -0,0 +1,112 @@
+/*
+ * 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@xxxxxxxxxx>
+ *
+ * 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 struct of_device_id of_hi6421_pmic_match_tbl[] = {
+ { .compatible = "hisilicon,hi6421-pmic", },
+ { },
+};
+
+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));
+
+ pmic->dev = &pdev->dev;
+ 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 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@xxxxxxxxxx>");
+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
index 0000000..2f9fe01
--- /dev/null
+++ b/include/linux/mfd/hi6421-pmic.h
@@ -0,0 +1,42 @@
+/*
+ * 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@xxxxxxxxxx>
+ *
+ * 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 device *dev;
+ struct regmap *regmap;
+};
+
+#endif /* __HI6421_PMIC_H */
--
1.9.1

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