mfd: Add support for Cherry Trail Dollar Cove TI PMIC

This patch adds the MFD driver for Dollar Cove (TI version) PMIC with
ACPI INT33F5 that is found on some Intel Cherry Trail devices.
The driver is based on the original work by Intel, found at:
  https://github.com/01org/ProductionKernelQuilts

This is a minimal version for adding the basic resources.  Currently,
only ACPI PMIC opregion and the external power-button are used.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=193891

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/Kconfig

@@ -510,6 +510,19 @@ config INTEL_SOC_PMIC_CHTWC
 	  available before any devices using it are probed. This option also
 	  causes the designware-i2c driver to be builtin for the same reason.
 
+config INTEL_SOC_PMIC_CHTDC_TI
+	tristate "Support for Intel Cherry Trail Dollar Cove TI PMIC"
+	depends on GPIOLIB
+	depends on I2C
+	depends on ACPI
+	depends on X86
+	select MFD_CORE
+	select REGMAP_I2C
+	select REGMAP_IRQ
+	help
+	  Select this option for supporting Dollar Cove (TI version) PMIC
+	  device that is found on some Intel Cherry Trail systems.
+
 config MFD_INTEL_LPSS
 	tristate
 	select COMMON_CLK

drivers/mfd/Makefile

@@ -218,6 +218,7 @@ intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
 obj-$(CONFIG_INTEL_SOC_PMIC_BXTWC)	+= intel_soc_pmic_bxtwc.o
 obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC)	+= intel_soc_pmic_chtwc.o
+obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI)	+= intel_soc_pmic_chtdc_ti.o
 obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o
 
 obj-$(CONFIG_MFD_ALTERA_A10SR)	+= altera-a10sr.o

drivers/mfd/intel_soc_pmic_chtdc_ti.c

@@ -0,0 +1,184 @@
+/*
+ * Device access for Dollar Cove TI PMIC
+ *
+ * Copyright (c) 2014, Intel Corporation.
+ *   Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
+ *
+ * Cleanup and forward-ported
+ *   Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
+ *
+ * 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.
+ */
+
+#include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#define CHTDC_TI_IRQLVL1	0x01
+#define CHTDC_TI_MASK_IRQLVL1	0x02
+
+/* Level 1 IRQs */
+enum {
+	CHTDC_TI_PWRBTN = 0,	/* power button */
+	CHTDC_TI_DIETMPWARN,	/* thermal */
+	CHTDC_TI_ADCCMPL,	/* ADC */
+	/* No IRQ 3 */
+	CHTDC_TI_VBATLOW = 4,	/* battery */
+	CHTDC_TI_VBUSDET,	/* power source */
+	/* No IRQ 6 */
+	CHTDC_TI_CCEOCAL = 7,	/* battery */
+};
+
+static struct resource power_button_resources[] = {
+	DEFINE_RES_IRQ(CHTDC_TI_PWRBTN),
+};
+
+static struct resource thermal_resources[] = {
+	DEFINE_RES_IRQ(CHTDC_TI_DIETMPWARN),
+};
+
+static struct resource adc_resources[] = {
+	DEFINE_RES_IRQ(CHTDC_TI_ADCCMPL),
+};
+
+static struct resource pwrsrc_resources[] = {
+	DEFINE_RES_IRQ(CHTDC_TI_VBUSDET),
+};
+
+static struct resource battery_resources[] = {
+	DEFINE_RES_IRQ(CHTDC_TI_VBATLOW),
+	DEFINE_RES_IRQ(CHTDC_TI_CCEOCAL),
+};
+
+static struct mfd_cell chtdc_ti_dev[] = {
+	{
+		.name = "chtdc_ti_pwrbtn",
+		.num_resources = ARRAY_SIZE(power_button_resources),
+		.resources = power_button_resources,
+	}, {
+		.name = "chtdc_ti_adc",
+		.num_resources = ARRAY_SIZE(adc_resources),
+		.resources = adc_resources,
+	}, {
+		.name = "chtdc_ti_thermal",
+		.num_resources = ARRAY_SIZE(thermal_resources),
+		.resources = thermal_resources,
+	}, {
+		.name = "chtdc_ti_pwrsrc",
+		.num_resources = ARRAY_SIZE(pwrsrc_resources),
+		.resources = pwrsrc_resources,
+	}, {
+		.name = "chtdc_ti_battery",
+		.num_resources = ARRAY_SIZE(battery_resources),
+		.resources = battery_resources,
+	},
+	{	.name = "chtdc_ti_region", },
+};
+
+static const struct regmap_config chtdc_ti_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 128,
+	.cache_type = REGCACHE_NONE,
+};
+
+static const struct regmap_irq chtdc_ti_irqs[] = {
+	REGMAP_IRQ_REG(CHTDC_TI_PWRBTN, 0, BIT(CHTDC_TI_PWRBTN)),
+	REGMAP_IRQ_REG(CHTDC_TI_DIETMPWARN, 0, BIT(CHTDC_TI_DIETMPWARN)),
+	REGMAP_IRQ_REG(CHTDC_TI_ADCCMPL, 0, BIT(CHTDC_TI_ADCCMPL)),
+	REGMAP_IRQ_REG(CHTDC_TI_VBATLOW, 0, BIT(CHTDC_TI_VBATLOW)),
+	REGMAP_IRQ_REG(CHTDC_TI_VBUSDET, 0, BIT(CHTDC_TI_VBUSDET)),
+	REGMAP_IRQ_REG(CHTDC_TI_CCEOCAL, 0, BIT(CHTDC_TI_CCEOCAL)),
+};
+
+static const struct regmap_irq_chip chtdc_ti_irq_chip = {
+	.name = KBUILD_MODNAME,
+	.irqs = chtdc_ti_irqs,
+	.num_irqs = ARRAY_SIZE(chtdc_ti_irqs),
+	.num_regs = 1,
+	.status_base = CHTDC_TI_IRQLVL1,
+	.mask_base = CHTDC_TI_MASK_IRQLVL1,
+	.ack_base = CHTDC_TI_IRQLVL1,
+};
+
+static int chtdc_ti_probe(struct i2c_client *i2c)
+{
+	struct device *dev = &i2c->dev;
+	struct intel_soc_pmic *pmic;
+	int ret;
+
+	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
+	if (!pmic)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, pmic);
+
+	pmic->regmap = devm_regmap_init_i2c(i2c, &chtdc_ti_regmap_config);
+	if (IS_ERR(pmic->regmap))
+		return PTR_ERR(pmic->regmap);
+	pmic->irq = i2c->irq;
+
+	ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
+				       IRQF_ONESHOT, 0,
+				       &chtdc_ti_irq_chip,
+				       &pmic->irq_chip_data);
+	if (ret)
+		return ret;
+
+	return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, chtdc_ti_dev,
+				    ARRAY_SIZE(chtdc_ti_dev), NULL, 0,
+				    regmap_irq_get_domain(pmic->irq_chip_data));
+}
+
+static void chtdc_ti_shutdown(struct i2c_client *i2c)
+{
+	struct intel_soc_pmic *pmic = i2c_get_clientdata(i2c);
+
+	disable_irq(pmic->irq);
+}
+
+static int __maybe_unused chtdc_ti_suspend(struct device *dev)
+{
+	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
+
+	disable_irq(pmic->irq);
+
+	return 0;
+}
+
+static int __maybe_unused chtdc_ti_resume(struct device *dev)
+{
+	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
+
+	enable_irq(pmic->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(chtdc_ti_pm_ops, chtdc_ti_suspend, chtdc_ti_resume);
+
+static const struct acpi_device_id chtdc_ti_acpi_ids[] = {
+	{ "INT33F5" },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, chtdc_ti_acpi_ids);
+
+static struct i2c_driver chtdc_ti_i2c_driver = {
+	.driver = {
+		.name = "intel_soc_pmic_chtdc_ti",
+		.pm = &chtdc_ti_pm_ops,
+		.acpi_match_table = chtdc_ti_acpi_ids,
+	},
+	.probe_new = chtdc_ti_probe,
+	.shutdown = chtdc_ti_shutdown,
+};
+module_i2c_driver(chtdc_ti_i2c_driver);
+
+MODULE_DESCRIPTION("I2C driver for Intel SoC Dollar Cove TI PMIC");
+MODULE_LICENSE("GPL v2");