Date:   Mon, 16 Oct 2017 20:03:15 +0800
From:   Baolin Wang <baolin.wang@...eadtrum.com>
To:     <lee.jones@...aro.org>, <robh+dt@...nel.org>,
        <mark.rutland@....com>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <broonie@...nel.org>, <baolin.wang@...aro.org>,
        <baolin.wang@...eadtrum.com>
Subject: [PATCH v2 2/2] mfd: Add Spreadtrum SC27xx series PMICs driver

This patch adds support for Spreadtrum SC27xx series PMIC MFD core, and It
provides communication through the SPI interfaces. The SC27xx series PMICs
contains the following 6 major components:
- DCDCs
- LDOs
- Battery management system
- Audio codec
- User interface function, such as indicator, flash LED
- IC level function, such as power on/off, type-c

Signed-off-by: Baolin Wang <baolin.wang@...eadtrum.com>
---
Changes since v1:
 - Re-order the including head files.
 - Add one condition to check register size and value size when reading.
 - Fix some coding style issues.
---
 drivers/mfd/Kconfig           |   10 ++
 drivers/mfd/Makefile          |    1 +
 drivers/mfd/sprd-sc27xx-spi.c |  264 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 275 insertions(+)
 create mode 100644 drivers/mfd/sprd-sc27xx-spi.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index fc5e4fe..4753cd5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1057,6 +1057,16 @@ config MFD_SMSC
         To compile this driver as a module, choose M here: the
         module will be called smsc.
 
+config MFD_SC27XX_PMIC
+	tristate "Spreadtrum SC27xx PMICs"
+	depends on ARCH_SPRD || COMPILE_TEST
+	depends on SPI_MASTER
+	select MFD_CORE
+	select REGMAP_SPI
+	select REGMAP_IRQ
+	help
+	  This enables support for the Spreadtrum SC27xx PMICs.
+
 config ABX500_CORE
 	bool "ST-Ericsson ABX500 Mixed Signal Circuit register functions"
 	default y if ARCH_U300 || ARCH_U8500 || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c3d0a1b..a377e0f 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -226,3 +226,4 @@ obj-$(CONFIG_MFD_SUN4I_GPADC)	+= sun4i-gpadc.o
 obj-$(CONFIG_MFD_STM32_LPTIMER)	+= stm32-lptimer.o
 obj-$(CONFIG_MFD_STM32_TIMERS) 	+= stm32-timers.o
 obj-$(CONFIG_MFD_MXS_LRADC)     += mxs-lradc.o
+obj-$(CONFIG_MFD_SC27XX_PMIC)	+= sprd-sc27xx-spi.o
diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
new file mode 100644
index 0000000..eb7ff5f
--- /dev/null
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (C) 2017 Spreadtrum Communications Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#define SPRD_PMIC_INT_MASK_STATUS	0x0
+#define SPRD_PMIC_INT_RAW_STATU		0x4
+#define SPRD_PMIC_INT_EN		0x8
+
+struct sprd_pmic {
+	struct regmap *regmap;
+	struct device *dev;
+	struct regmap_irq *irqs;
+	struct regmap_irq_chip irq_chip;
+	struct regmap_irq_chip_data *irq_data;
+	int irq;
+};
+
+struct sprd_pmic_data {
+	u32 irq_base;
+	u32 num_irqs;
+};
+
+/*
+ * Since different PMICs of SC27xx series can have different interrupt
+ * base address and irq number, we should save irq number and irq base
+ * in the device data structure.
+ */
+static const struct sprd_pmic_data sc2731_data = {
+	.irq_base = 0x140,
+	.num_irqs = 16,
+};
+
+static const struct mfd_cell sprd_pmic_devs[] = {
+	{
+		.name = "sc27xx-wdt",
+		.of_compatible = "sprd,sc27xx-wdt",
+	}, {
+		.name = "sc27xx-rtc",
+		.of_compatible = "sprd,sc27xx-rtc",
+	}, {
+		.name = "sc27xx-charger",
+		.of_compatible = "sprd,sc27xx-charger",
+	}, {
+		.name = "sc27xx-chg-timer",
+		.of_compatible = "sprd,sc27xx-chg-timer",
+	}, {
+		.name = "sc27xx-fast-chg",
+		.of_compatible = "sprd,sc27xx-fast-chg",
+	}, {
+		.name = "sc27xx-chg-wdt",
+		.of_compatible = "sprd,sc27xx-chg-wdt",
+	}, {
+		.name = "sc27xx-typec",
+		.of_compatible = "sprd,sc27xx-typec",
+	}, {
+		.name = "sc27xx-flash",
+		.of_compatible = "sprd,sc27xx-flash",
+	}, {
+		.name = "sc27xx-eic",
+		.of_compatible = "sprd,sc27xx-eic",
+	}, {
+		.name = "sc27xx-efuse",
+		.of_compatible = "sprd,sc27xx-efuse",
+	}, {
+		.name = "sc27xx-thermal",
+		.of_compatible = "sprd,sc27xx-thermal",
+	}, {
+		.name = "sc27xx-adc",
+		.of_compatible = "sprd,sc27xx-adc",
+	}, {
+		.name = "sc27xx-audio-codec",
+		.of_compatible = "sprd,sc27xx-audio-codec",
+	}, {
+		.name = "sc27xx-regulator",
+		.of_compatible = "sprd,sc27xx-regulator",
+	}, {
+		.name = "sc27xx-vibrator",
+		.of_compatible = "sprd,sc27xx-vibrator",
+	}, {
+		.name = "sc27xx-keypad-led",
+		.of_compatible = "sprd,sc27xx-keypad-led",
+	}, {
+		.name = "sc27xx-bltc",
+		.of_compatible = "sprd,sc27xx-bltc",
+	}, {
+		.name = "sc27xx-fgu",
+		.of_compatible = "sprd,sc27xx-fgu",
+	}, {
+		.name = "sc27xx-7sreset",
+		.of_compatible = "sprd,sc27xx-7sreset",
+	}, {
+		.name = "sc27xx-poweroff",
+		.of_compatible = "sprd,sc27xx-poweroff",
+	},
+};
+
+static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+
+	return spi_write(spi, data, count);
+}
+
+static int sprd_pmic_spi_read(void *context,
+			      const void *reg, size_t reg_size,
+			      void *val, size_t val_size)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+	u32 rx_buf[2] = { 0 };
+	int ret;
+
+	/* Now we only support one PMIC register to read every time. */
+	if (reg_size != sizeof(u32) || val_size != sizeof(u32))
+		return -EINVAL;
+
+	rx_buf[0] = *(u32 *)reg;
+	ret = spi_read(spi, rx_buf, 1);
+	if (ret < 0)
+		return ret;
+
+	memcpy(val, rx_buf, val_size);
+	return 0;
+}
+
+static struct regmap_bus sprd_pmic_regmap = {
+	.write = sprd_pmic_spi_write,
+	.read = sprd_pmic_spi_read,
+	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
+	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+};
+
+static const struct regmap_config sprd_pmic_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = 0xffff,
+};
+
+static int sprd_pmic_probe(struct spi_device *spi)
+{
+	struct sprd_pmic *sprd_pmic;
+	const struct sprd_pmic_data *data;
+	int ret, i;
+
+	data = of_device_get_match_data(&spi->dev);
+	if (!data) {
+		dev_err(&spi->dev, "No matching driver data found\n");
+		return -EINVAL;
+	}
+
+	sprd_pmic = devm_kzalloc(&spi->dev, sizeof(*sprd_pmic), GFP_KERNEL);
+	if (!sprd_pmic)
+		return -ENOMEM;
+
+	sprd_pmic->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
+					     &spi->dev, &sprd_pmic_config);
+	if (IS_ERR(sprd_pmic->regmap)) {
+		ret = PTR_ERR(sprd_pmic->regmap);
+		dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
+		return ret;
+	}
+
+	spi_set_drvdata(spi, sprd_pmic);
+	sprd_pmic->dev = &spi->dev;
+	sprd_pmic->irq = spi->irq;
+
+	sprd_pmic->irq_chip.name = dev_name(&spi->dev);
+	sprd_pmic->irq_chip.status_base =
+		data->irq_base + SPRD_PMIC_INT_MASK_STATUS;
+	sprd_pmic->irq_chip.mask_base = data->irq_base + SPRD_PMIC_INT_EN;
+	sprd_pmic->irq_chip.ack_base = 0;
+	sprd_pmic->irq_chip.num_regs = 1;
+	sprd_pmic->irq_chip.num_irqs = data->num_irqs;
+	sprd_pmic->irq_chip.mask_invert = true;
+
+	sprd_pmic->irqs = devm_kzalloc(&spi->dev, sizeof(struct regmap_irq) *
+				       data->num_irqs, GFP_KERNEL);
+	if (!sprd_pmic->irqs)
+		return -ENOMEM;
+
+	sprd_pmic->irq_chip.irqs = sprd_pmic->irqs;
+	for (i = 0; i < data->num_irqs; i++) {
+		sprd_pmic->irqs[i].reg_offset = i / data->num_irqs;
+		sprd_pmic->irqs[i].mask = BIT(i % data->num_irqs);
+	}
+
+	ret = devm_regmap_add_irq_chip(&spi->dev, sprd_pmic->regmap,
+				       sprd_pmic->irq,
+				       IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
+				       &sprd_pmic->irq_chip,
+				       &sprd_pmic->irq_data);
+	if (ret) {
+		dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
+		return ret;
+	}
+
+	ret = mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO, sprd_pmic_devs,
+			      ARRAY_SIZE(sprd_pmic_devs), NULL, 0,
+			      regmap_irq_get_domain(sprd_pmic->irq_data));
+	if (ret) {
+		dev_err(&spi->dev, "Failed to register device %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sprd_pmic_remove(struct spi_device *spi)
+{
+	mfd_remove_devices(&spi->dev);
+
+	return 0;
+}
+
+static const struct of_device_id sprd_pmic_match[] = {
+	{ .compatible = "sprd,sc2731", .data = &sc2731_data },
+	{},
+};
+MODULE_DEVICE_TABLE(of, sprd_pmic_match);
+
+static struct spi_driver sprd_pmic_driver = {
+	.driver = {
+		.name = "sc27xx-pmic",
+		.bus = &spi_bus_type,
+		.of_match_table = sprd_pmic_match,
+	},
+	.probe = sprd_pmic_probe,
+	.remove = sprd_pmic_remove,
+};
+
+static int __init sprd_pmic_init(void)
+{
+	return spi_register_driver(&sprd_pmic_driver);
+}
+subsys_initcall(sprd_pmic_init);
+
+static void __exit sprd_pmic_exit(void)
+{
+	spi_unregister_driver(&sprd_pmic_driver);
+}
+module_exit(sprd_pmic_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SPI support for SC27xx PMICs");
+MODULE_AUTHOR("Baolin Wang <baolin.wang@...eadtrum.com>");
-- 
1.7.9.5

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