Merge tag 'staging-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging/IIO updates from Greg KH:
 "Here is the big staging tree update for 4.12-rc1.

  It's a big one, adding about 350k new lines of crap^Wcode, mostly all
  in a big dump of media drivers from Intel. But there's other new
  drivers in here as well, yet-another-wifi driver, new IIO drivers, and
  a new crypto accelerator.

  We also deleted a bunch of stuff, mostly in patch cleanups, but also
  the Android ION code has shrunk a lot, and the Android low memory
  killer driver was finally deleted, much to the celebration of the -mm
  developers.

  All of these have been in linux-next with a few build issues that will
  show up when you merge to your tree"

Merge conflicts in the new rtl8723bs driver (due to the wifi changes
this merge window) handled as per linux-next, courtesy of Stephen
Rothwell.

* tag 'staging-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (1182 commits)
  staging: fsl-mc/dpio: add cpu <--> LE conversion for dpaa2_fd
  staging: ks7010: remove line continuations in quoted strings
  staging: vt6656: use tabs instead of spaces
  staging: android: ion: Fix unnecessary initialization of static variable
  staging: media: atomisp: fix range checking on clk_num
  staging: media: atomisp: fix misspelled word in comment
  staging: media: atomisp: kmap() can't fail
  staging: atomisp: remove #ifdef for runtime PM functions
  staging: atomisp: satm include directory is gone
  atomisp: remove some more unused files
  atomisp: remove hmm_load/store/clear indirections
  atomisp: kill off mmgr_free
  atomisp: clean up the hmm init/cleanup indirections
  atomisp: handle allocation calls before init in the hmm layer
  staging: fsl-dpaa2/eth: Add maintainer for Ethernet driver
  staging: fsl-dpaa2/eth: Add TODO file
  staging: fsl-dpaa2/eth: Add trace points
  staging: fsl-dpaa2/eth: Add driver specific stats
  staging: fsl-dpaa2/eth: Add ethtool support
  staging: fsl-dpaa2/eth: Add Freescale DPAA2 Ethernet driver
  ...

1 files changed, 295 insertions, 0 deletions

diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c
new file mode 100644
index 000000000000..62670cbfa2bb
--- /dev/null
+++ b/drivers/iio/adc/aspeed_adc.c
@@ -0,0 +1,295 @@
+/*
+ * Aspeed AST2400/2500 ADC
+ *
+ * Copyright (C) 2017 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
+
+#define ASPEED_RESOLUTION_BITS		10
+#define ASPEED_CLOCKS_PER_SAMPLE	12
+
+#define ASPEED_REG_ENGINE_CONTROL	0x00
+#define ASPEED_REG_INTERRUPT_CONTROL	0x04
+#define ASPEED_REG_VGA_DETECT_CONTROL	0x08
+#define ASPEED_REG_CLOCK_CONTROL	0x0C
+#define ASPEED_REG_MAX			0xC0
+
+#define ASPEED_OPERATION_MODE_POWER_DOWN	(0x0 << 1)
+#define ASPEED_OPERATION_MODE_STANDBY		(0x1 << 1)
+#define ASPEED_OPERATION_MODE_NORMAL		(0x7 << 1)
+
+#define ASPEED_ENGINE_ENABLE		BIT(0)
+
+struct aspeed_adc_model_data {
+	const char *model_name;
+	unsigned int min_sampling_rate;	// Hz
+	unsigned int max_sampling_rate;	// Hz
+	unsigned int vref_voltage;	// mV
+};
+
+struct aspeed_adc_data {
+	struct device	*dev;
+	void __iomem	*base;
+	spinlock_t	clk_lock;
+	struct clk_hw	*clk_prescaler;
+	struct clk_hw	*clk_scaler;
+};
+
+#define ASPEED_CHAN(_idx, _data_reg_addr) {			\
+	.type = IIO_VOLTAGE,					\
+	.indexed = 1,						\
+	.channel = (_idx),					\
+	.address = (_data_reg_addr),				\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |	\
+				BIT(IIO_CHAN_INFO_SAMP_FREQ),	\
+}
+
+static const struct iio_chan_spec aspeed_adc_iio_channels[] = {
+	ASPEED_CHAN(0, 0x10),
+	ASPEED_CHAN(1, 0x12),
+	ASPEED_CHAN(2, 0x14),
+	ASPEED_CHAN(3, 0x16),
+	ASPEED_CHAN(4, 0x18),
+	ASPEED_CHAN(5, 0x1A),
+	ASPEED_CHAN(6, 0x1C),
+	ASPEED_CHAN(7, 0x1E),
+	ASPEED_CHAN(8, 0x20),
+	ASPEED_CHAN(9, 0x22),
+	ASPEED_CHAN(10, 0x24),
+	ASPEED_CHAN(11, 0x26),
+	ASPEED_CHAN(12, 0x28),
+	ASPEED_CHAN(13, 0x2A),
+	ASPEED_CHAN(14, 0x2C),
+	ASPEED_CHAN(15, 0x2E),
+};
+
+static int aspeed_adc_read_raw(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       int *val, int *val2, long mask)
+{
+	struct aspeed_adc_data *data = iio_priv(indio_dev);
+	const struct aspeed_adc_model_data *model_data =
+			of_device_get_match_data(data->dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		*val = readw(data->base + chan->address);
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = model_data->vref_voltage;
+		*val2 = ASPEED_RESOLUTION_BITS;
+		return IIO_VAL_FRACTIONAL_LOG2;
+
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = clk_get_rate(data->clk_scaler->clk) /
+				ASPEED_CLOCKS_PER_SAMPLE;
+		return IIO_VAL_INT;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int aspeed_adc_write_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int val, int val2, long mask)
+{
+	struct aspeed_adc_data *data = iio_priv(indio_dev);
+	const struct aspeed_adc_model_data *model_data =
+			of_device_get_match_data(data->dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		if (val < model_data->min_sampling_rate ||
+			val > model_data->max_sampling_rate)
+			return -EINVAL;
+
+		clk_set_rate(data->clk_scaler->clk,
+				val * ASPEED_CLOCKS_PER_SAMPLE);
+		return 0;
+
+	case IIO_CHAN_INFO_SCALE:
+	case IIO_CHAN_INFO_RAW:
+		/*
+		 * Technically, these could be written but the only reasons
+		 * for doing so seem better handled in userspace.  EPERM is
+		 * returned to signal this is a policy choice rather than a
+		 * hardware limitation.
+		 */
+		return -EPERM;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int aspeed_adc_reg_access(struct iio_dev *indio_dev,
+				 unsigned int reg, unsigned int writeval,
+				 unsigned int *readval)
+{
+	struct aspeed_adc_data *data = iio_priv(indio_dev);
+
+	if (!readval || reg % 4 || reg > ASPEED_REG_MAX)
+		return -EINVAL;
+
+	*readval = readl(data->base + reg);
+
+	return 0;
+}
+
+static const struct iio_info aspeed_adc_iio_info = {
+	.driver_module = THIS_MODULE,
+	.read_raw = aspeed_adc_read_raw,
+	.write_raw = aspeed_adc_write_raw,
+	.debugfs_reg_access = aspeed_adc_reg_access,
+};
+
+static int aspeed_adc_probe(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev;
+	struct aspeed_adc_data *data;
+	const struct aspeed_adc_model_data *model_data;
+	struct resource *res;
+	const char *clk_parent_name;
+	int ret;
+	u32 adc_engine_control_reg_val;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->base))
+		return PTR_ERR(data->base);
+
+	/* Register ADC clock prescaler with source specified by device tree. */
+	spin_lock_init(&data->clk_lock);
+	clk_parent_name = of_clk_get_parent_name(pdev->dev.of_node, 0);
+
+	data->clk_prescaler = clk_hw_register_divider(
+				&pdev->dev, "prescaler", clk_parent_name, 0,
+				data->base + ASPEED_REG_CLOCK_CONTROL,
+				17, 15, 0, &data->clk_lock);
+	if (IS_ERR(data->clk_prescaler))
+		return PTR_ERR(data->clk_prescaler);
+
+	/*
+	 * Register ADC clock scaler downstream from the prescaler. Allow rate
+	 * setting to adjust the prescaler as well.
+	 */
+	data->clk_scaler = clk_hw_register_divider(
+				&pdev->dev, "scaler", "prescaler",
+				CLK_SET_RATE_PARENT,
+				data->base + ASPEED_REG_CLOCK_CONTROL,
+				0, 10, 0, &data->clk_lock);
+	if (IS_ERR(data->clk_scaler)) {
+		ret = PTR_ERR(data->clk_scaler);
+		goto scaler_error;
+	}
+
+	/* Start all channels in normal mode. */
+	clk_prepare_enable(data->clk_scaler->clk);
+	adc_engine_control_reg_val = GENMASK(31, 16) |
+		ASPEED_OPERATION_MODE_NORMAL | ASPEED_ENGINE_ENABLE;
+	writel(adc_engine_control_reg_val,
+		data->base + ASPEED_REG_ENGINE_CONTROL);
+
+	model_data = of_device_get_match_data(&pdev->dev);
+	indio_dev->name = model_data->model_name;
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->info = &aspeed_adc_iio_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = aspeed_adc_iio_channels;
+	indio_dev->num_channels = ARRAY_SIZE(aspeed_adc_iio_channels);
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto iio_register_error;
+
+	return 0;
+
+iio_register_error:
+	writel(ASPEED_OPERATION_MODE_POWER_DOWN,
+		data->base + ASPEED_REG_ENGINE_CONTROL);
+	clk_disable_unprepare(data->clk_scaler->clk);
+	clk_hw_unregister_divider(data->clk_scaler);
+
+scaler_error:
+	clk_hw_unregister_divider(data->clk_prescaler);
+	return ret;
+}
+
+static int aspeed_adc_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct aspeed_adc_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	writel(ASPEED_OPERATION_MODE_POWER_DOWN,
+		data->base + ASPEED_REG_ENGINE_CONTROL);
+	clk_disable_unprepare(data->clk_scaler->clk);
+	clk_hw_unregister_divider(data->clk_scaler);
+	clk_hw_unregister_divider(data->clk_prescaler);
+
+	return 0;
+}
+
+static const struct aspeed_adc_model_data ast2400_model_data = {
+	.model_name = "ast2400-adc",
+	.vref_voltage = 2500, // mV
+	.min_sampling_rate = 10000,
+	.max_sampling_rate = 500000,
+};
+
+static const struct aspeed_adc_model_data ast2500_model_data = {
+	.model_name = "ast2500-adc",
+	.vref_voltage = 1800, // mV
+	.min_sampling_rate = 1,
+	.max_sampling_rate = 1000000,
+};
+
+static const struct of_device_id aspeed_adc_matches[] = {
+	{ .compatible = "aspeed,ast2400-adc", .data = &ast2400_model_data },
+	{ .compatible = "aspeed,ast2500-adc", .data = &ast2500_model_data },
+	{},
+};
+MODULE_DEVICE_TABLE(of, aspeed_adc_matches);
+
+static struct platform_driver aspeed_adc_driver = {
+	.probe = aspeed_adc_probe,
+	.remove = aspeed_adc_remove,
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.of_match_table = aspeed_adc_matches,
+	}
+};
+
+module_platform_driver(aspeed_adc_driver);
+
+MODULE_AUTHOR("Rick Altherr <raltherr@google.com>");
+MODULE_DESCRIPTION("Aspeed AST2400/2500 ADC Driver");
+MODULE_LICENSE("GPL");