[PATCH 3/6] mfd: hi6421v530: add support for HiSilicon Hi6421v530

[Guodong Xu <guodong.xu@linaro.org>]

Add support for HiSilicon Hi6421v530 PMIC. Hi6421v530 communicates with
main SoC via memory-mapped I/O.

Hi6421v530 and Hi6421 are PMIC chips from the same vendor, HiSilicon, but
at different revisions. They share the same memory-mapped I/O design. They
differ in regulator details, eg. LDO voltage points.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
---
 drivers/mfd/Kconfig           |  9 +++++
 drivers/mfd/Makefile          |  1 +
 drivers/mfd/hi6421v530-pmic.c | 92 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+)
 create mode 100644 drivers/mfd/hi6421v530-pmic.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3eb5c93..bdc8304 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -388,6 +388,15 @@ config MFD_HI6421_PMIC
 	  menus in order to enable them.
 	  We communicate with the Hi6421 via memory-mapped I/O.
 
+config MFD_HI6421V530_PMIC
+	tristate "HiSilicon Hi6421v530 PMU/Codec IC"
+	depends on OF
+	select MFD_CORE
+	select REGMAP_MMIO
+	help
+	  Add support for HiSilicon Hi6421v530 PMIC. Hi6421v530 communicates
+	  with main SoC via memory-mapped I/O.
+
 config MFD_HI655X_PMIC
 	tristate "HiSilicon Hi655X series PMU/Codec IC"
 	depends on ARCH_HISI || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c16bf1e..cde62fc 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -206,6 +206,7 @@ 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
+obj-$(CONFIG_MFD_HI6421V530_PMIC)	+= hi6421v530-pmic.o
 obj-$(CONFIG_MFD_HI655X_PMIC)   += hi655x-pmic.o
 obj-$(CONFIG_MFD_DLN2)		+= dln2.o
 obj-$(CONFIG_MFD_RT5033)	+= rt5033.o
diff --git a/drivers/mfd/hi6421v530-pmic.c b/drivers/mfd/hi6421v530-pmic.c
new file mode 100644
index 0000000..651659a
--- /dev/null
+++ b/drivers/mfd/hi6421v530-pmic.c
@@ -0,0 +1,92 @@
+/*
+ * Device driver for Hi6421 IC
+ *
+ * Copyright (c) <2017> HiSilicon Technologies Co., Ltd.
+ *              http://www.hisilicon.com
+ * Copyright (c) <2017> Linaro Ltd.
+ *              http://www.linaro.org
+ *
+ * Author: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
+ *         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 hi6421v530_devs[] = {
+	{ .name = "hi6421v530-regulator", },
+};
+
+static int hi6421v530_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);
+	}
+
+	platform_set_drvdata(pdev, pmic);
+
+	ret = devm_mfd_add_devices(&pdev->dev, 0, hi6421v530_devs,
+				   ARRAY_SIZE(hi6421v530_devs), NULL, 0, NULL);
+	if (ret) {
+		dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id of_hi6421v530_pmic_match_tbl[] = {
+	{ .compatible = "hisilicon,hi6421v530-pmic", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, of_hi6421v530_pmic_match_tbl);
+
+static struct platform_driver hi6421v530_pmic_driver = {
+	.driver = {
+		.name	= "hi6421v530_pmic",
+		.of_match_table = of_hi6421v530_pmic_match_tbl,
+	},
+	.probe	= hi6421v530_pmic_probe,
+};
+module_platform_driver(hi6421v530_pmic_driver);
+
+MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
+MODULE_DESCRIPTION("Hi6421v530 PMIC driver");
+MODULE_LICENSE("GPL v2");
-- 
2.10.2