Merge tag 'mfd-next-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd

Pull MFD updates from Lee Jones:
 "New Drivers:
   - Add STMPE ADC Input driver
   - Add STMicroelectronics STPMIC1 Parent driver
   - Add STMicroelectronics STPMIC1 OnKey Misc driver
   - Add STMicroelectronics STPMIC1 Watchdog driver
   - Add Cirrus Logic Lochnagar Parent driver
   - Add TQ-Systems TQMX86 Parent driver

  New Device Support:
   - Add support for ADC to STMPE

  New (or moved) Functionality:
   - Move Lightbar functionality to its own driver; cros_ec_lightbar
   - Move VBC functionality to its own driver; cros_ec_vbc
   - Move VBC functionality to its own driver; cros_ec_vbc
   - Move DebugFS functionality to its own driver; cros_ec_debugfs
   - Move SYSFS functionality to its own driver; cros_ec_sysfs
   - Add support for input voltage options; tps65218

  Fixes:
   - Use devm_* managed resources; cros_ec
   - Device Tree documentation; stmpe, aspeed-lpc, lochnagar
   - Trivial Clean-ups; stmpe
   - Rip out broken modular code; aat2870-core, adp5520, as3711,
         db8500-prcmu, htc-i2cpld, max8925-core, rc5t583, sta2x11-mfd,
	 syscon, tps65090, tps65910, tps68470 tps80031, wm831x-spi,
	 wm831x-i2c, wm831x-core, wm8350-i2c, wm8350-core, wm8400-core
   - Kconfig fixups; INTEL_SOC_PMIC
   - Improve error path; sm501, sec-core
   - Use struct_size() helper; sm501
   - Constify; at91-usart
   - Use pointers instead of copying data; at91-usart
   - Deliver proper return value; cros_ec_dev
   - Trivial formatting/whitespace; sec-core"

* tag 'mfd-next-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (53 commits)
  mfd: mxs-lradc: Mark expected switch fall-through
  mfd: sec-core: Cleanup formatting to a consistent style
  mfd: tqmx86: IO controller with I2C, Wachdog and GPIO
  mfd: intel-lpss: Move linux/pm.h to the local header
  mfd: cros_ec_dev: Return number of bytes read with CROS_EC_DEV_IOCRDMEM
  mfd: tps68470: Drop unused MODULE_DEVICE_TABLE
  mfd: at91-usart: No need to copy mfd_cell in probe
  mfd: at91-usart: Constify at91_usart_spi_subdev and at91_usart_serial_subdev
  mfd: lochnagar: Add support for the Cirrus Logic Lochnagar
  mfd: lochnagar: Add initial binding documentation
  dt-bindings: mfd: aspeed-lpc: Make parameter optional
  mfd: sec-core: Return gracefully instead of BUG() if device cannot match
  mfd: sm501: Use struct_size() in devm_kzalloc()
  mfd: sm501: Fix potential NULL pointer dereference
  mfd: Kconfig: Fix I2C_DESIGNWARE_PLATFORM dependencies
  mfd: tps65218.c: Add input voltage options
  mfd: wm8400-core: Make it explicitly non-modular
  mfd: wm8350-core: Drop unused module infrastructure from non-modular code
  mfd: wm8350-i2c: Make it explicitly non-modular
  mfd: wm831x-core: Drop unused module infrastructure from non-modular code
  ...

3 files changed, 371 insertions, 0 deletions

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 5debc67df70a..76db6e5cc296 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -817,6 +817,13 @@ config STM32_DFSDM_ADC
 	  This driver can also be built as a module.  If so, the module
 	  will be called stm32-dfsdm-adc.
 
+config STMPE_ADC
+	tristate "STMicroelectronics STMPE ADC driver"
+	depends on OF && MFD_STMPE
+	help
+	  Say yes here to build support for ST Microelectronics STMPE
+	  built-in ADC block (stmpe811).
+
 config STX104
 	tristate "Apex Embedded Systems STX104 driver"
 	depends on PC104 && X86
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index d50eb47da484..6fcebd167524 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -77,6 +77,7 @@ obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
 obj-$(CONFIG_STM32_ADC) += stm32-adc.o
 obj-$(CONFIG_STM32_DFSDM_CORE) += stm32-dfsdm-core.o
 obj-$(CONFIG_STM32_DFSDM_ADC) += stm32-dfsdm-adc.o
+obj-$(CONFIG_STMPE_ADC) += stmpe-adc.o
 obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
 obj-$(CONFIG_TI_ADC0832) += ti-adc0832.o
 obj-$(CONFIG_TI_ADC084S021) += ti-adc084s021.o
diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
new file mode 100644
index 000000000000..37f4b74a5d32
--- /dev/null
+++ b/drivers/iio/adc/stmpe-adc.c
@@ -0,0 +1,363 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  STMicroelectronics STMPE811 IIO ADC Driver
+ *
+ *  4 channel, 10/12-bit ADC
+ *
+ *  Copyright (C) 2013-2018 Toradex AG <stefan.agner@toradex.com>
+ */
+
+#include <linux/completion.h>
+#include <linux/err.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/stmpe.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+
+#define STMPE_REG_INT_STA		0x0B
+#define STMPE_REG_ADC_INT_EN		0x0E
+#define STMPE_REG_ADC_INT_STA		0x0F
+
+#define STMPE_REG_ADC_CTRL1		0x20
+#define STMPE_REG_ADC_CTRL2		0x21
+#define STMPE_REG_ADC_CAPT		0x22
+#define STMPE_REG_ADC_DATA_CH(channel)	(0x30 + 2 * (channel))
+
+#define STMPE_REG_TEMP_CTRL		0x60
+#define STMPE_TEMP_CTRL_ENABLE		BIT(0)
+#define STMPE_TEMP_CTRL_ACQ		BIT(1)
+#define STMPE_TEMP_CTRL_THRES_EN	BIT(3)
+#define STMPE_START_ONE_TEMP_CONV	(STMPE_TEMP_CTRL_ENABLE | \
+					STMPE_TEMP_CTRL_ACQ | \
+					STMPE_TEMP_CTRL_THRES_EN)
+#define STMPE_REG_TEMP_DATA		0x61
+#define STMPE_REG_TEMP_TH		0x63
+#define STMPE_ADC_LAST_NR		7
+#define STMPE_TEMP_CHANNEL		(STMPE_ADC_LAST_NR + 1)
+
+#define STMPE_ADC_CH(channel)		((1 << (channel)) & 0xff)
+
+#define STMPE_ADC_TIMEOUT		msecs_to_jiffies(1000)
+
+struct stmpe_adc {
+	struct stmpe *stmpe;
+	struct clk *clk;
+	struct device *dev;
+	struct mutex lock;
+
+	/* We are allocating plus one for the temperature channel */
+	struct iio_chan_spec stmpe_adc_iio_channels[STMPE_ADC_LAST_NR + 2];
+
+	struct completion completion;
+
+	u8 channel;
+	u32 value;
+};
+
+static int stmpe_read_voltage(struct stmpe_adc *info,
+		struct iio_chan_spec const *chan, int *val)
+{
+	long ret;
+
+	mutex_lock(&info->lock);
+
+	info->channel = (u8)chan->channel;
+
+	if (info->channel > STMPE_ADC_LAST_NR) {
+		mutex_unlock(&info->lock);
+		return -EINVAL;
+	}
+
+	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_EN,
+			STMPE_ADC_CH(info->channel));
+
+	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_CAPT,
+			STMPE_ADC_CH(info->channel));
+
+	*val = info->value;
+
+	ret = wait_for_completion_interruptible_timeout
+		(&info->completion, STMPE_ADC_TIMEOUT);
+
+	if (ret <= 0) {
+		mutex_unlock(&info->lock);
+		if (ret == 0)
+			return -ETIMEDOUT;
+		else
+			return ret;
+	}
+
+	*val = info->value;
+
+	mutex_unlock(&info->lock);
+
+	return 0;
+}
+
+static int stmpe_read_temp(struct stmpe_adc *info,
+		struct iio_chan_spec const *chan, int *val)
+{
+	long ret;
+
+	mutex_lock(&info->lock);
+
+	info->channel = (u8)chan->channel;
+
+	if (info->channel != STMPE_TEMP_CHANNEL) {
+		mutex_unlock(&info->lock);
+		return -EINVAL;
+	}
+
+	stmpe_reg_write(info->stmpe, STMPE_REG_TEMP_CTRL,
+			STMPE_START_ONE_TEMP_CONV);
+
+	ret = wait_for_completion_interruptible_timeout
+		(&info->completion, STMPE_ADC_TIMEOUT);
+
+	if (ret <= 0) {
+		mutex_unlock(&info->lock);
+		if (ret == 0)
+			return -ETIMEDOUT;
+		else
+			return ret;
+	}
+
+	/*
+	 * absolute temp = +V3.3 * value /7.51 [K]
+	 * scale to [milli °C]
+	 */
+	*val = ((449960l * info->value) / 1024l) - 273150;
+
+	mutex_unlock(&info->lock);
+
+	return 0;
+}
+
+static int stmpe_read_raw(struct iio_dev *indio_dev,
+			  struct iio_chan_spec const *chan,
+			  int *val,
+			  int *val2,
+			  long mask)
+{
+	struct stmpe_adc *info = iio_priv(indio_dev);
+	long ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+	case IIO_CHAN_INFO_PROCESSED:
+
+		switch (chan->type) {
+		case IIO_VOLTAGE:
+			ret = stmpe_read_voltage(info, chan, val);
+			break;
+
+		case IIO_TEMP:
+			ret = stmpe_read_temp(info, chan, val);
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		if (ret < 0)
+			return ret;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = 3300;
+		*val2 = info->stmpe->mod_12b ? 12 : 10;
+		return IIO_VAL_FRACTIONAL_LOG2;
+
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
+static irqreturn_t stmpe_adc_isr(int irq, void *dev_id)
+{
+	struct stmpe_adc *info = (struct stmpe_adc *)dev_id;
+	u16 data;
+
+	if (info->channel > STMPE_TEMP_CHANNEL)
+		return IRQ_NONE;
+
+	if (info->channel <= STMPE_ADC_LAST_NR) {
+		int int_sta;
+
+		int_sta = stmpe_reg_read(info->stmpe, STMPE_REG_ADC_INT_STA);
+
+		/* Is the interrupt relevant */
+		if (!(int_sta & STMPE_ADC_CH(info->channel)))
+			return IRQ_NONE;
+
+		/* Read value */
+		stmpe_block_read(info->stmpe,
+			STMPE_REG_ADC_DATA_CH(info->channel), 2, (u8 *) &data);
+
+		stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA, int_sta);
+	} else if (info->channel == STMPE_TEMP_CHANNEL) {
+		/* Read value */
+		stmpe_block_read(info->stmpe, STMPE_REG_TEMP_DATA, 2,
+				(u8 *) &data);
+	}
+
+	info->value = (u32) be16_to_cpu(data);
+	complete(&info->completion);
+
+	return IRQ_HANDLED;
+}
+
+static const struct iio_info stmpe_adc_iio_info = {
+	.read_raw = &stmpe_read_raw,
+};
+
+static void stmpe_adc_voltage_chan(struct iio_chan_spec *ics, int chan)
+{
+	ics->type = IIO_VOLTAGE;
+	ics->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
+	ics->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
+	ics->indexed = 1;
+	ics->channel = chan;
+}
+
+static void stmpe_adc_temp_chan(struct iio_chan_spec *ics, int chan)
+{
+	ics->type = IIO_TEMP;
+	ics->info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED);
+	ics->indexed = 1;
+	ics->channel = chan;
+}
+
+static int stmpe_adc_init_hw(struct stmpe_adc *adc)
+{
+	int ret;
+	struct stmpe *stmpe = adc->stmpe;
+
+	ret = stmpe_enable(stmpe, STMPE_BLOCK_ADC);
+	if (ret) {
+		dev_err(stmpe->dev, "Could not enable clock for ADC\n");
+		return ret;
+	}
+
+	ret = stmpe811_adc_common_init(stmpe);
+	if (ret) {
+		stmpe_disable(stmpe, STMPE_BLOCK_ADC);
+		return ret;
+	}
+
+	/* use temp irq for each conversion completion */
+	stmpe_reg_write(stmpe, STMPE_REG_TEMP_TH, 0);
+	stmpe_reg_write(stmpe, STMPE_REG_TEMP_TH + 1, 0);
+
+	return 0;
+}
+
+static int stmpe_adc_probe(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev;
+	struct stmpe_adc *info;
+	struct device_node *np;
+	u32 norequest_mask = 0;
+	int irq_temp, irq_adc;
+	int num_chan = 0;
+	int i = 0;
+	int ret;
+
+	irq_adc = platform_get_irq_byname(pdev, "STMPE_ADC");
+	if (irq_adc < 0)
+		return irq_adc;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct stmpe_adc));
+	if (!indio_dev) {
+		dev_err(&pdev->dev, "failed allocating iio device\n");
+		return -ENOMEM;
+	}
+
+	info = iio_priv(indio_dev);
+	mutex_init(&info->lock);
+
+	init_completion(&info->completion);
+	ret = devm_request_threaded_irq(&pdev->dev, irq_adc, NULL,
+					stmpe_adc_isr, IRQF_ONESHOT,
+					"stmpe-adc", info);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
+				irq_adc);
+		return ret;
+	}
+
+	irq_temp = platform_get_irq_byname(pdev, "STMPE_TEMP_SENS");
+	if (irq_temp >= 0) {
+		ret = devm_request_threaded_irq(&pdev->dev, irq_temp, NULL,
+						stmpe_adc_isr, IRQF_ONESHOT,
+						"stmpe-adc", info);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "failed requesting irq for"
+				 " temp sensor, irq = %d\n", irq_temp);
+	}
+
+	platform_set_drvdata(pdev, indio_dev);
+
+	indio_dev->name		= dev_name(&pdev->dev);
+	indio_dev->dev.parent	= &pdev->dev;
+	indio_dev->info		= &stmpe_adc_iio_info;
+	indio_dev->modes	= INDIO_DIRECT_MODE;
+
+	info->stmpe = dev_get_drvdata(pdev->dev.parent);
+
+	np = pdev->dev.of_node;
+
+	if (!np)
+		dev_err(&pdev->dev, "no device tree node found\n");
+
+	of_property_read_u32(np, "st,norequest-mask", &norequest_mask);
+
+	for_each_clear_bit(i, (unsigned long *) &norequest_mask,
+			   (STMPE_ADC_LAST_NR + 1)) {
+		stmpe_adc_voltage_chan(&info->stmpe_adc_iio_channels[num_chan], i);
+		num_chan++;
+	}
+	stmpe_adc_temp_chan(&info->stmpe_adc_iio_channels[num_chan], i);
+	num_chan++;
+	indio_dev->channels = info->stmpe_adc_iio_channels;
+	indio_dev->num_channels = num_chan;
+
+	ret = stmpe_adc_init_hw(info);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(&pdev->dev, indio_dev);
+}
+
+static int __maybe_unused stmpe_adc_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct stmpe_adc *info = iio_priv(indio_dev);
+
+	stmpe_adc_init_hw(info);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(stmpe_adc_pm_ops, NULL, stmpe_adc_resume);
+
+static struct platform_driver stmpe_adc_driver = {
+	.probe		= stmpe_adc_probe,
+	.driver		= {
+		.name	= "stmpe-adc",
+		.pm	= &stmpe_adc_pm_ops,
+	},
+};
+
+module_platform_driver(stmpe_adc_driver);
+
+MODULE_AUTHOR("Stefan Agner <stefan.agner@toradex.com>");
+MODULE_DESCRIPTION("STMPEXXX ADC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:stmpe-adc");