[PATCH 3/3] iio: frequency: New driver for AD9523 SPI Low Jitter Clock Generator

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From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>

Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
---
 .../Documentation/frequency/sysfs-bus-iio-ad9523   |   31 +
 drivers/staging/iio/frequency/Kconfig              |   22 +-
 drivers/staging/iio/frequency/Makefile             |    3 +-
 drivers/staging/iio/frequency/ad9523.c             | 1040 ++++++++++++++++++++
 drivers/staging/iio/frequency/ad9523.h             |  112 +++
 5 files changed, 1206 insertions(+), 2 deletions(-)
 create mode 100644 drivers/staging/iio/Documentation/frequency/sysfs-bus-iio-ad9523
 create mode 100644 drivers/staging/iio/frequency/ad9523.c
 create mode 100644 drivers/staging/iio/frequency/ad9523.h

diff --git a/drivers/staging/iio/Documentation/frequency/sysfs-bus-iio-ad9523 b/drivers/staging/iio/Documentation/frequency/sysfs-bus-iio-ad9523
new file mode 100644
index 0000000..79328d1
--- /dev/null
+++ b/drivers/staging/iio/Documentation/frequency/sysfs-bus-iio-ad9523
@@ -0,0 +1,31 @@
+What:		/sys/bus/iio/devices/iio:deviceX/status_pllY_lock_detect
+What:		/sys/bus/iio/devices/iio:deviceX/status_pllY_feedback_clock
+What:		/sys/bus/iio/devices/iio:deviceX/status_pllY_reference_clock
+What:		/sys/bus/iio/devices/iio:deviceX/status_reference_a
+What:		/sys/bus/iio/devices/iio:deviceX/status_reference_b
+What:		/sys/bus/iio/devices/iio:deviceX/status_reference_test
+What:		/sys/bus/iio/devices/iio:deviceX/status_vcxo
+KernelVersion:	3.4.0
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Reading returns either 'OK' or 'FAIL'. 'OK' means that the
+		clock in question is present or the pllY is locked. 'FAIL'
+		means that the clock is missing or the pllY is unlocked.
+
+What:		/sys/bus/iio/devices/iio:deviceX/store_eeprom
+KernelVersion:	3.4.0
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Writing '1' stores the current device configuration into
+		on-chip EEPROM. After power-up or chip reset the device will
+		automatically load the saved configuration.
+
+What:		/sys/bus/iio/devices/iio:deviceX/sync_dividers
+KernelVersion:	3.4.0
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Writing '1' triggers the clock distribution synchronization
+		functionality. All dividers are reset and the channels start
+		with their predefined phase offsets (out_altvoltageY_phase).
+		Writing this file has the effect as driving the external
+		/SYNC pin low.
diff --git a/drivers/staging/iio/frequency/Kconfig b/drivers/staging/iio/frequency/Kconfig
index 93b7141..7b2c0c3 100644
--- a/drivers/staging/iio/frequency/Kconfig
+++ b/drivers/staging/iio/frequency/Kconfig
@@ -1,6 +1,25 @@
 #
-# Direct Digital Synthesis drivers
+# Frequency
+#	Direct Digital Synthesis drivers (DDS)
+#	Clock Distribution device drivers
+#	Phase-Locked Loop (PLL) frequency synthesizers
 #
+
+menu "Frequency Synthesizers DDS/PLL"
+menu "Clock Generator/Distribution"
+
+config AD9523
+	tristate "Analog Devices AD9523 Low Jitter Clock Generator"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices AD9523 Low Jitter
+	  Clock Generator. The driver provides direct access via sysfs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad9523.
+
+endmenu
+
 menu "Direct Digital Synthesis"
 
 config AD5930
@@ -59,3 +78,4 @@ config AD9951
 	  ad9951, provides direct access via sysfs.
 
 endmenu
+endmenu
diff --git a/drivers/staging/iio/frequency/Makefile b/drivers/staging/iio/frequency/Makefile
index 1477461..e0157b6 100644
--- a/drivers/staging/iio/frequency/Makefile
+++ b/drivers/staging/iio/frequency/Makefile
@@ -1,5 +1,5 @@
 #
-# Makefile for Direct Digital Synthesis drivers
+# Makefile iio/frequency
 #
 
 obj-$(CONFIG_AD5930) += ad5930.o
@@ -9,3 +9,4 @@ obj-$(CONFIG_AD9850) += ad9850.o
 obj-$(CONFIG_AD9852) += ad9852.o
 obj-$(CONFIG_AD9910) += ad9910.o
 obj-$(CONFIG_AD9951) += ad9951.o
+obj-$(CONFIG_AD9523) += ad9523.o
diff --git a/drivers/staging/iio/frequency/ad9523.c b/drivers/staging/iio/frequency/ad9523.c
new file mode 100644
index 0000000..bb43386
--- /dev/null
+++ b/drivers/staging/iio/frequency/ad9523.c
@@ -0,0 +1,1040 @@
+/*
+ * AD9523 SPI Low Jitter Clock Generator
+ *
+ * Copyright 2012 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "ad9523.h"
+
+#define AD9523_READ	(1 << 15)
+#define AD9523_WRITE	(0 << 15)
+#define AD9523_CNT(x)	(((x) - 1) << 13)
+#define AD9523_ADDR(x)	((x) & 0xFFF)
+
+#define AD9523_R1B	(1 << 16)
+#define AD9523_R2B	(2 << 16)
+#define AD9523_R3B	(3 << 16)
+#define AD9523_TRANSF_LEN(x)			((x) >> 16)
+
+#define AD9523_SERIAL_PORT_CONFIG		(AD9523_R1B | 0x0)
+#define AD9523_VERSION_REGISTER			(AD9523_R1B | 0x2)
+#define AD9523_PART_REGISTER			(AD9523_R1B | 0x3)
+#define AD9523_READBACK_CTRL			(AD9523_R1B | 0x4)
+
+#define AD9523_EEPROM_CUSTOMER_VERSION_ID	(AD9523_R2B | 0x6)
+
+#define AD9523_PLL1_REF_A_DIVIDER		(AD9523_R2B | 0x11)
+#define AD9523_PLL1_REF_B_DIVIDER		(AD9523_R2B | 0x13)
+#define AD9523_PLL1_REF_TEST_DIVIDER		(AD9523_R1B | 0x14)
+#define AD9523_PLL1_FEEDBACK_DIVIDER		(AD9523_R2B | 0x17)
+#define AD9523_PLL1_CHARGE_PUMP_CTRL		(AD9523_R2B | 0x19)
+#define AD9523_PLL1_INPUT_RECEIVERS_CTRL	(AD9523_R1B | 0x1A)
+#define AD9523_PLL1_REF_CTRL			(AD9523_R1B | 0x1B)
+#define AD9523_PLL1_MISC_CTRL			(AD9523_R1B | 0x1C)
+#define AD9523_PLL1_LOOP_FILTER_CTRL		(AD9523_R1B | 0x1D)
+
+#define AD9523_PLL2_CHARGE_PUMP			(AD9523_R1B | 0xF0)
+#define AD9523_PLL2_FEEDBACK_DIVIDER_AB		(AD9523_R1B | 0xF1)
+#define AD9523_PLL2_CTRL			(AD9523_R1B | 0xF2)
+#define AD9523_PLL2_VCO_CTRL			(AD9523_R1B | 0xF3)
+#define AD9523_PLL2_VCO_DIVIDER			(AD9523_R1B | 0xF4)
+#define AD9523_PLL2_LOOP_FILTER_CTRL		(AD9523_R2B | 0xF6)
+#define AD9523_PLL2_R2_DIVIDER			(AD9523_R1B | 0xF7)
+
+#define AD9523_CHANNEL_CLOCK_DIST(ch)		(AD9523_R3B | (0x192 + 3 * ch))
+
+#define AD9523_PLL1_OUTPUT_CTRL			(AD9523_R1B | 0x1BA)
+#define AD9523_PLL1_OUTPUT_CHANNEL_CTRL		(AD9523_R1B | 0x1BB)
+
+#define AD9523_READBACK_0			(AD9523_R1B | 0x22C)
+#define AD9523_READBACK_1			(AD9523_R1B | 0x22D)
+
+#define AD9523_STATUS_SIGNALS			(AD9523_R3B | 0x232)
+#define AD9523_POWER_DOWN_CTRL			(AD9523_R1B | 0x233)
+#define AD9523_IO_UPDATE			(AD9523_R1B | 0x234)
+
+#define AD9523_EEPROM_DATA_XFER_STATUS		(AD9523_R1B | 0xB00)
+#define AD9523_EEPROM_ERROR_READBACK		(AD9523_R1B | 0xB01)
+#define AD9523_EEPROM_CTRL1			(AD9523_R1B | 0xB02)
+#define AD9523_EEPROM_CTRL2			(AD9523_R1B | 0xB03)
+
+/* AD9523_SERIAL_PORT_CONFIG */
+
+#define AD9523_SER_CONF_SDO_ACTIVE		(1 << 7)
+#define AD9523_SER_CONF_SOFT_RESET		(1 << 5)
+
+/* AD9523_READBACK_CTRL */
+#define AD9523_READBACK_CTRL_READ_BUFFERED	(1 << 0)
+
+/* AD9523_PLL1_CHARGE_PUMP_CTRL */
+#define AD9523_PLL1_CHARGE_PUMP_CURRENT_nA(x)	(((x) / 500) & 0x7F)
+#define AD9523_PLL1_CHARGE_PUMP_TRISTATE	(1 << 7)
+#define AD9523_PLL1_CHARGE_PUMP_MODE_NORMAL	(3 << 8)
+#define AD9523_PLL1_CHARGE_PUMP_MODE_PUMP_DOWN	(2 << 8)
+#define AD9523_PLL1_CHARGE_PUMP_MODE_PUMP_UP	(1 << 8)
+#define AD9523_PLL1_CHARGE_PUMP_MODE_TRISTATE	(0 << 8)
+#define AD9523_PLL1_BACKLASH_PW_MIN		(0 << 10)
+#define AD9523_PLL1_BACKLASH_PW_LOW		(1 << 10)
+#define AD9523_PLL1_BACKLASH_PW_HIGH		(2 << 10)
+#define AD9523_PLL1_BACKLASH_PW_MAX		(3 << 10)
+
+/* AD9523_PLL1_INPUT_RECEIVERS_CTRL */
+#define AD9523_PLL1_REF_TEST_RCV_EN		(1 << 7)
+#define AD9523_PLL1_REFB_DIFF_RCV_EN		(1 << 6)
+#define AD9523_PLL1_REFA_DIFF_RCV_EN		(1 << 5)
+#define AD9523_PLL1_REFB_RCV_EN			(1 << 4)
+#define AD9523_PLL1_REFA_RCV_EN			(1 << 3)
+#define AD9523_PLL1_REFA_REFB_PWR_CTRL_EN	(1 << 2)
+#define AD9523_PLL1_OSC_IN_CMOS_NEG_INP_EN	(1 << 1)
+#define AD9523_PLL1_OSC_IN_DIFF_EN		(1 << 0)
+
+/* AD9523_PLL1_REF_CTRL */
+#define AD9523_PLL1_BYPASS_REF_TEST_DIV_EN	(1 << 7)
+#define AD9523_PLL1_BYPASS_FEEDBACK_DIV_EN	(1 << 6)
+#define AD9523_PLL1_ZERO_DELAY_MODE_INT		(1 << 5)
+#define AD9523_PLL1_ZERO_DELAY_MODE_EXT		(0 << 5)
+#define AD9523_PLL1_OSC_IN_PLL_FEEDBACK_EN	(1 << 4)
+#define AD9523_PLL1_ZD_IN_CMOS_NEG_INP_EN	(1 << 3)
+#define AD9523_PLL1_ZD_IN_DIFF_EN		(1 << 2)
+#define AD9523_PLL1_REFB_CMOS_NEG_INP_EN	(1 << 1)
+#define AD9523_PLL1_REFA_CMOS_NEG_INP_EN	(1 << 0)
+
+/* AD9523_PLL1_MISC_CTRL */
+#define AD9523_PLL1_REFB_INDEP_DIV_CTRL_EN	(1 << 7)
+#define AD9523_PLL1_OSC_CTRL_FAIL_VCC_BY2_EN	(1 << 6)
+#define AD9523_PLL1_REF_MODE(x)			((x) << 2)
+#define AD9523_PLL1_BYPASS_REFB_DIV		(1 << 1)
+#define AD9523_PLL1_BYPASS_REFA_DIV		(1 << 0)
+
+/* AD9523_PLL1_LOOP_FILTER_CTRL */
+#define AD9523_PLL1_LOOP_FILTER_RZERO(x)	((x) & 0xF)
+
+/* AD9523_PLL2_CHARGE_PUMP */
+#define AD9523_PLL2_CHARGE_PUMP_CURRENT_nA(x)	((x) / 3500)
+
+/* AD9523_PLL2_FEEDBACK_DIVIDER_AB */
+#define AD9523_PLL2_FB_NDIV_A_CNT(x)		(((x) & 0x3) << 6)
+#define AD9523_PLL2_FB_NDIV_B_CNT(x)		(((x) & 0x3F) << 0)
+#define AD9523_PLL2_FB_NDIV(a, b)		(4 * (b) + (a))
+
+/* AD9523_PLL2_CTRL */
+#define AD9523_PLL2_CHARGE_PUMP_MODE_NORMAL	(3 << 0)
+#define AD9523_PLL2_CHARGE_PUMP_MODE_PUMP_DOWN	(2 << 0)
+#define AD9523_PLL2_CHARGE_PUMP_MODE_PUMP_UP	(1 << 0)
+#define AD9523_PLL2_CHARGE_PUMP_MODE_TRISTATE	(0 << 0)
+#define AD9523_PLL2_BACKLASH_PW_MIN		(0 << 2)
+#define AD9523_PLL2_BACKLASH_PW_LOW		(1 << 2)
+#define AD9523_PLL2_BACKLASH_PW_HIGH		(2 << 2)
+#define AD9523_PLL2_BACKLASH_PW_MAX		(3 << 1)
+#define AD9523_PLL2_BACKLASH_CTRL_EN		(1 << 4)
+#define AD9523_PLL2_FREQ_DOUBLER_EN		(1 << 5)
+#define AD9523_PLL2_LOCK_DETECT_PWR_DOWN_EN	(1 << 7)
+
+/* AD9523_PLL2_VCO_CTRL */
+#define AD9523_PLL2_VCO_CALIBRATE		(1 << 1)
+#define AD9523_PLL2_FORCE_VCO_MIDSCALE		(1 << 2)
+#define AD9523_PLL2_FORCE_REFERENCE_VALID	(1 << 3)
+#define AD9523_PLL2_FORCE_RELEASE_SYNC		(1 << 4)
+
+/* AD9523_PLL2_VCO_DIVIDER */
+#define AD9523_PLL2_VCO_DIV_M1(x)		((((x) - 3) & 0x3) << 0)
+#define AD9523_PLL2_VCO_DIV_M2(x)		((((x) - 3) & 0x3) << 4)
+#define AD9523_PLL2_VCO_DIV_M1_PWR_DOWN_EN	(1 << 2)
+#define AD9523_PLL2_VCO_DIV_M2_PWR_DOWN_EN	(1 << 6)
+
+/* AD9523_PLL2_LOOP_FILTER_CTRL */
+#define AD9523_PLL2_LOOP_FILTER_CPOLE1(x)	(((x) & 0x7) << 0)
+#define AD9523_PLL2_LOOP_FILTER_RZERO(x)	(((x) & 0x7) << 3)
+#define AD9523_PLL2_LOOP_FILTER_RPOLE2(x)	(((x) & 0x7) << 6)
+#define AD9523_PLL2_LOOP_FILTER_RZERO_BYPASS_EN	(1 << 8)
+
+/* AD9523_PLL2_R2_DIVIDER */
+#define AD9523_PLL2_R2_DIVIDER_VAL(x)		(((x) & 0x1F) << 0)
+
+/* AD9523_CHANNEL_CLOCK_DIST */
+#define AD9523_CLK_DIST_DIV_PHASE(x)		(((x) & 0x3F) << 18)
+#define AD9523_CLK_DIST_DIV_PHASE_REV(x)	((ret >> 18) & 0x3F)
+#define AD9523_CLK_DIST_DIV(x)			((((x) - 1) & 0x3FF) << 8)
+#define AD9523_CLK_DIST_DIV_REV(x)		(((ret >> 8) & 0x3FF) + 1)
+#define AD9523_CLK_DIST_INV_DIV_OUTPUT_EN	(1 << 7)
+#define AD9523_CLK_DIST_IGNORE_SYNC_EN		(1 << 6)
+#define AD9523_CLK_DIST_PWR_DOWN_EN		(1 << 5)
+#define AD9523_CLK_DIST_LOW_PWR_MODE_EN		(1 << 4)
+#define AD9523_CLK_DIST_DRIVER_MODE(x)		(((x) & 0xF) << 0)
+
+/* AD9523_PLL1_OUTPUT_CTRL */
+#define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH6_M2	(1 << 7)
+#define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH5_M2	(1 << 6)
+#define AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH4_M2	(1 << 5)
+#define AD9523_PLL1_OUTP_CTRL_CMOS_DRV_WEAK		(1 << 4)
+#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_1		(0 << 0)
+#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_2		(1 << 0)
+#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_4		(2 << 0)
+#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_8		(4 << 0)
+#define AD9523_PLL1_OUTP_CTRL_OUTPUT_DIV_16		(8 << 0)
+
+/* AD9523_PLL1_OUTPUT_CHANNEL_CTRL */
+#define AD9523_PLL1_OUTP_CH_CTRL_OUTPUT_PWR_DOWN_EN	(1 << 7)
+#define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH9_M2	(1 << 6)
+#define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH8_M2	(1 << 5)
+#define AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH7_M2	(1 << 4)
+#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH3	(1 << 3)
+#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH2	(1 << 2)
+#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH1	(1 << 1)
+#define AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH0	(1 << 0)
+
+/* AD9523_READBACK_0 */
+#define AD9523_READBACK_0_STAT_PLL2_REF_CLK		(1 << 7)
+#define AD9523_READBACK_0_STAT_PLL2_FB_CLK		(1 << 6)
+#define AD9523_READBACK_0_STAT_VCXO			(1 << 5)
+#define AD9523_READBACK_0_STAT_REF_TEST			(1 << 4)
+#define AD9523_READBACK_0_STAT_REFB			(1 << 3)
+#define AD9523_READBACK_0_STAT_REFA			(1 << 2)
+#define AD9523_READBACK_0_STAT_PLL2_LD			(1 << 1)
+#define AD9523_READBACK_0_STAT_PLL1_LD			(1 << 0)
+
+/* AD9523_READBACK_1 */
+#define AD9523_READBACK_1_HOLDOVER_ACTIVE		(1 << 3)
+#define AD9523_READBACK_1_AUTOMODE_SEL_REFB		(1 << 2)
+#define AD9523_READBACK_1_VCO_CALIB_IN_PROGRESS		(1 << 0)
+
+/* AD9523_STATUS_SIGNALS */
+#define AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL		(1 << 16)
+#define AD9523_STATUS_MONITOR_01_PLL12_LOCKED		(0x302)
+/* AD9523_POWER_DOWN_CTRL */
+#define AD9523_POWER_DOWN_CTRL_PLL1_PWR_DOWN		(1 << 2)
+#define AD9523_POWER_DOWN_CTRL_PLL2_PWR_DOWN		(1 << 1)
+#define AD9523_POWER_DOWN_CTRL_DIST_PWR_DOWN		(1 << 0)
+
+/* AD9523_IO_UPDATE */
+#define AD9523_IO_UPDATE_EN				(1 << 0)
+
+/* AD9523_EEPROM_DATA_XFER_STATUS */
+#define AD9523_EEPROM_DATA_XFER_IN_PROGRESS		(1 << 0)
+
+/* AD9523_EEPROM_ERROR_READBACK */
+#define AD9523_EEPROM_ERROR_READBACK_FAIL		(1 << 0)
+
+/* AD9523_EEPROM_CTRL1 */
+#define AD9523_EEPROM_CTRL1_SOFT_EEPROM			(1 << 1)
+#define AD9523_EEPROM_CTRL1_EEPROM_WRITE_PROT_DIS	(1 << 0)
+
+/* AD9523_EEPROM_CTRL2 */
+#define AD9523_EEPROM_CTRL2_REG2EEPROM			(1 << 0)
+
+#define AD9523_NUM_CHAN					14
+#define AD9523_NUM_CHAN_ALT_CLK_SRC			10
+
+#define AD_IF(_pde, _a) ((pdata->_pde) ? _a : 0)
+#define AD_IFE(_pde, _a, _b) ((pdata->_pde) ? _a : _b)
+
+enum {
+	AD9523_STAT_PLL1_LD,
+	AD9523_STAT_PLL2_LD,
+	AD9523_STAT_REFA,
+	AD9523_STAT_REFB,
+	AD9523_STAT_REF_TEST,
+	AD9523_STAT_VCXO,
+	AD9523_STAT_PLL2_FB_CLK,
+	AD9523_STAT_PLL2_REF_CLK,
+	AD9523_SYNC,
+	AD9523_EEPROM,
+};
+
+enum {
+	AD9523_VCO1,
+	AD9523_VCO2,
+	AD9523_VCXO,
+	AD9523_NUM_CLK_SRC,
+};
+
+struct ad9523_state {
+	struct spi_device		*spi;
+	struct regulator		*reg;
+	struct ad9523_platform_data	*pdata;
+	struct iio_chan_spec		ad9523_channels[AD9523_NUM_CHAN];
+
+	unsigned long		vcxo_freq;
+	unsigned long		vco_freq;
+	unsigned long		vco_out_freq[AD9523_NUM_CLK_SRC];
+	unsigned char		vco_out_map[AD9523_NUM_CHAN_ALT_CLK_SRC];
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	union {
+		__be32 d32;
+		u8 d8[4];
+	} data[2] ____cacheline_aligned;
+};
+
+static int ad9523_read(struct iio_dev *indio_dev, unsigned addr)
+{
+	struct ad9523_state *st = iio_priv(indio_dev);
+	struct spi_message m;
+	int ret;
+	struct spi_transfer t[] = {
+		{
+			.tx_buf = &st->data[0].d8[2],
+			.len = 2,
+			.cs_change = 0,
+		}, {
+			.rx_buf = &st->data[1].d8[4 - AD9523_TRANSF_LEN(addr)],
+			.len = AD9523_TRANSF_LEN(addr),
+		},
+	};
+
+	spi_message_init(&m);
+	spi_message_add_tail(&t[0], &m);
+	spi_message_add_tail(&t[1], &m);
+
+	st->data[0].d32 = cpu_to_be32(AD9523_READ |
+				      AD9523_CNT(AD9523_TRANSF_LEN(addr)) |
+				      AD9523_ADDR(addr));
+
+	ret = spi_sync(st->spi, &m);
+	if (ret >= 0)
+		ret = be32_to_cpu(st->data[1].d32) & (0xFFFFFF >>
+				  (8 * (3 - AD9523_TRANSF_LEN(addr))));
+	else
+		dev_err(&indio_dev->dev, "read failed (%d)", ret);
+
+	return ret;
+};
+
+static int ad9523_write(struct iio_dev *indio_dev, unsigned addr, unsigned val)
+{
+	struct ad9523_state *st = iio_priv(indio_dev);
+	struct spi_message m;
+	int ret;
+	struct spi_transfer t[] = {
+		{
+			.tx_buf = &st->data[0].d8[2],
+			.len = 2,
+			.cs_change = 0,
+		}, {
+			.tx_buf = &st->data[1].d8[4 - AD9523_TRANSF_LEN(addr)],
+			.len = AD9523_TRANSF_LEN(addr),
+		},
+	};
+
+	spi_message_init(&m);
+	spi_message_add_tail(&t[0], &m);
+	spi_message_add_tail(&t[1], &m);
+
+	st->data[0].d32 = cpu_to_be32(AD9523_WRITE |
+				      AD9523_CNT(AD9523_TRANSF_LEN(addr)) |
+				      AD9523_ADDR(addr));
+	st->data[1].d32 = cpu_to_be32(val);
+
+	ret = spi_sync(st->spi, &m);
+
+	if (ret < 0)
+		dev_err(&indio_dev->dev, "write failed (%d)", ret);
+
+	return ret;
+}
+
+static int ad9523_io_update(struct iio_dev *indio_dev)
+{
+	return ad9523_write(indio_dev, AD9523_IO_UPDATE, AD9523_IO_UPDATE_EN);
+}
+
+static int ad9523_vco_out_map(struct iio_dev *indio_dev,
+			      unsigned ch, bool out)
+{
+	struct ad9523_state *st = iio_priv(indio_dev);
+	int ret;
+	unsigned mask;
+
+	switch (ch) {
+	case 0 ... 3:
+		ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CHANNEL_CTRL);
+		if (ret < 0)
+			break;
+		mask = AD9523_PLL1_OUTP_CH_CTRL_VCXO_SRC_SEL_CH0 << ch;
+		if (out) {
+			ret |= mask;
+			out = 2;
+		} else {
+			ret &= ~mask;
+		}
+		ret = ad9523_write(indio_dev,
+				   AD9523_PLL1_OUTPUT_CHANNEL_CTRL, ret);
+		break;
+	case 4 ... 6:
+		ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CTRL);
+		if (ret < 0)
+			break;
+		mask = AD9523_PLL1_OUTP_CTRL_VCO_DIV_SEL_CH4_M2 << (ch - 4);
+		if (out)
+			ret |= mask;
+		else
+			ret &= ~mask;
+		ret = ad9523_write(indio_dev, AD9523_PLL1_OUTPUT_CTRL, ret);
+		break;
+	case 7 ... 9:
+		ret = ad9523_read(indio_dev, AD9523_PLL1_OUTPUT_CHANNEL_CTRL);
+		if (ret < 0)
+			break;
+		mask = AD9523_PLL1_OUTP_CH_CTRL_VCO_DIV_SEL_CH7_M2 << (ch - 7);
+		if (out)
+			ret |= mask;
+		else
+			ret &= ~mask;
+		ret = ad9523_write(indio_dev,
+				   AD9523_PLL1_OUTPUT_CHANNEL_CTRL, ret);
+		break;
+	default:
+		return 0;
+	}
+
+	st->vco_out_map[ch] = out;
+	return ret;
+}
+
+static int ad9523_set_clock_provider(struct iio_dev *indio_dev,
+			      unsigned ch, unsigned long freq)
+{
+	struct ad9523_state *st = iio_priv(indio_dev);
+	long tmp1, tmp2;
+	bool use_alt_clk_src;
+
+	switch (ch) {
+	case 0 ... 3:
+		if (freq == st->vco_out_freq[AD9523_VCXO])
+			use_alt_clk_src = true;
+		else
+			use_alt_clk_src = false;
+
+		break;
+	case 4 ... 9:
+		tmp1 = st->vco_out_freq[AD9523_VCO1] / freq;
+		tmp2 = st->vco_out_freq[AD9523_VCO2] / freq;
+		tmp1 *= freq;
+		tmp2 *= freq;
+		if (abs(tmp1 - freq) > abs(tmp2 - freq))
+			use_alt_clk_src = true;
+		else
+			use_alt_clk_src = false;
+		break;
+	default:
+		return 0;
+	}
+
+	return ad9523_vco_out_map(indio_dev, ch, use_alt_clk_src);
+}
+
+static ssize_t ad9523_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t len)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	unsigned long readin, tmp;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &readin);
+	if (ret)
+		return ret;
+
+	mutex_lock(&indio_dev->mlock);
+	switch ((u32)this_attr->address) {
+	case AD9523_SYNC:
+		ret = ad9523_read(indio_dev, AD9523_STATUS_SIGNALS);
+		if (ret < 0)
+			goto out;
+		tmp = ret;
+		tmp |= AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL;
+		ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS, tmp);
+		if (ret < 0)
+			goto out;
+		ad9523_io_update(indio_dev);
+		tmp &= ~AD9523_STATUS_SIGNALS_SYNC_MAN_CTRL;
+		ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS, tmp);
+		if (ret < 0)
+			goto out;
+		break;
+	case AD9523_EEPROM:
+		if (readin != 1) {
+			ret = -EINVAL;
+			goto out;
+		}
+		ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL1,
+				   AD9523_EEPROM_CTRL1_EEPROM_WRITE_PROT_DIS);
+		if (ret < 0)
+			goto out;
+		ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL2,
+				   AD9523_EEPROM_CTRL2_REG2EEPROM);
+		if (ret < 0)
+			goto out;
+
+		tmp = 4;
+		do {
+			msleep(16);
+			ret = ad9523_read(indio_dev,
+					  AD9523_EEPROM_DATA_XFER_STATUS);
+			if (ret < 0)
+				goto out;
+		} while ((ret & AD9523_EEPROM_DATA_XFER_IN_PROGRESS) && tmp--);
+
+		ret = ad9523_write(indio_dev, AD9523_EEPROM_CTRL1, 0);
+		if (ret < 0)
+			goto out;
+
+		ret = ad9523_read(indio_dev, AD9523_EEPROM_ERROR_READBACK);
+		if (ret < 0)
+			goto out;
+
+		if (ret & AD9523_EEPROM_ERROR_READBACK_FAIL) {
+			dev_err(&indio_dev->dev, "Verify EEPROM failed");
+			ret = -EIO;
+		}
+		break;
+	default:
+		ret = -ENODEV;
+		goto out;
+	}
+
+	ret = ad9523_io_update(indio_dev);
+out:
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret ? ret : len;
+}
+
+static ssize_t ad9523_show(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	int ret = 0;
+
+	mutex_lock(&indio_dev->mlock);
+	ret = ad9523_read(indio_dev, AD9523_READBACK_0);
+	if (ret >= 0) {
+		ret = sprintf(buf, "%s\n", (ret & (1 <<
+			(u32)this_attr->address)) ? "OK" : "FAIL");
+	}
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret;
+}
+
+static IIO_DEVICE_ATTR(status_pll1_lock_detect, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_PLL1_LD);
+
+static IIO_DEVICE_ATTR(status_pll2_lock_detect, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_PLL2_LD);
+
+static IIO_DEVICE_ATTR(status_reference_a, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_REFA);
+
+static IIO_DEVICE_ATTR(status_reference_b, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_REFB);
+
+static IIO_DEVICE_ATTR(status_reference_test, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_REF_TEST);
+
+static IIO_DEVICE_ATTR(status_vcxo, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_VCXO);
+
+static IIO_DEVICE_ATTR(status_pll2_feedback_clock, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_PLL2_FB_CLK);
+
+static IIO_DEVICE_ATTR(status_pll2_reference_clock, S_IRUGO,
+			ad9523_show,
+			NULL,
+			AD9523_STAT_PLL2_REF_CLK);
+
+static IIO_DEVICE_ATTR(sync_dividers, S_IWUSR,
+			NULL,
+			ad9523_store,
+			AD9523_SYNC);
+
+static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR,
+			NULL,
+			ad9523_store,
+			AD9523_EEPROM);
+
+static struct attribute *ad9523_attributes[] = {
+	&iio_dev_attr_sync_dividers.dev_attr.attr,
+	&iio_dev_attr_store_eeprom.dev_attr.attr,
+	&iio_dev_attr_status_pll1_lock_detect.dev_attr.attr,
+	&iio_dev_attr_status_pll2_lock_detect.dev_attr.attr,
+	&iio_dev_attr_status_reference_a.dev_attr.attr,
+	&iio_dev_attr_status_reference_b.dev_attr.attr,
+	&iio_dev_attr_status_reference_test.dev_attr.attr,
+	&iio_dev_attr_status_vcxo.dev_attr.attr,
+	&iio_dev_attr_status_pll2_feedback_clock.dev_attr.attr,
+	&iio_dev_attr_status_pll2_reference_clock.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ad9523_attribute_group = {
+	.attrs = ad9523_attributes,
+};
+
+static int ad9523_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long m)
+{
+	struct ad9523_state *st = iio_priv(indio_dev);
+	unsigned code;
+	int ret;
+
+	mutex_lock(&indio_dev->mlock);
+	ret = ad9523_read(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel));
+	mutex_unlock(&indio_dev->mlock);
+
+	if (ret < 0)
+		return ret;
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		*val = !(ret & AD9523_CLK_DIST_PWR_DOWN_EN);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_FREQUENCY:
+		*val = st->vco_out_freq[st->vco_out_map[chan->channel]] /
+			AD9523_CLK_DIST_DIV_REV(ret);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_PHASE:
+		code = (AD9523_CLK_DIST_DIV_PHASE_REV(ret) * 3141592) /
+			AD9523_CLK_DIST_DIV_REV(ret);
+		*val = code / 1000000;
+		*val2 = (code % 1000000) * 10;
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+};
+
+static int ad9523_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val,
+			    int val2,
+			    long mask)
+{
+	struct ad9523_state *st = iio_priv(indio_dev);
+	unsigned reg;
+	int ret, tmp, code;
+
+	mutex_lock(&indio_dev->mlock);
+	ret = ad9523_read(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel));
+	if (ret < 0)
+		goto out;
+
+	reg = ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (val)
+			reg &= ~AD9523_CLK_DIST_PWR_DOWN_EN;
+		else
+			reg |= AD9523_CLK_DIST_PWR_DOWN_EN;
+		break;
+	case IIO_CHAN_INFO_FREQUENCY:
+		ret = ad9523_set_clock_provider(indio_dev, chan->channel, val);
+		if (ret < 0)
+			goto out;
+		tmp = st->vco_out_freq[st->vco_out_map[chan->channel]] / val;
+		tmp = clamp(tmp, 1, 1024);
+		reg &= ~(0x3FF << 8);
+		reg |= AD9523_CLK_DIST_DIV(tmp);
+		break;
+	case IIO_CHAN_INFO_PHASE:
+		code = val * 1000000 + val2 % 1000000;
+		tmp = (code * AD9523_CLK_DIST_DIV_REV(ret)) / 3141592;
+		tmp = clamp(tmp, 0, 63);
+		reg &= ~AD9523_CLK_DIST_DIV_PHASE(~0);
+		reg |= AD9523_CLK_DIST_DIV_PHASE(tmp);
+		break;
+	default:
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = ad9523_write(indio_dev, AD9523_CHANNEL_CLOCK_DIST(chan->channel),
+			   reg);
+	if (ret < 0)
+		goto out;
+
+	ad9523_io_update(indio_dev);
+out:
+	mutex_unlock(&indio_dev->mlock);
+	return ret;
+}
+
+static int ad9523_reg_access(struct iio_dev *indio_dev,
+			      unsigned reg, unsigned writeval,
+			      unsigned *readval)
+{
+	int ret;
+
+	mutex_lock(&indio_dev->mlock);
+	if (readval == NULL) {
+		ret = ad9523_write(indio_dev, reg | AD9523_R1B, writeval);
+		ad9523_io_update(indio_dev);
+	} else {
+		ret = ad9523_read(indio_dev, reg | AD9523_R1B);
+		if (ret < 0)
+			return ret;
+		*readval = ret;
+		ret = 0;
+	}
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret;
+}
+
+static const struct iio_info ad9523_info = {
+	.read_raw = &ad9523_read_raw,
+	.write_raw = &ad9523_write_raw,
+	.debugfs_reg_access = &ad9523_reg_access,
+	.attrs = &ad9523_attribute_group,
+	.driver_module = THIS_MODULE,
+};
+
+static int ad9523_setup(struct iio_dev *indio_dev)
+{
+	struct ad9523_state *st = iio_priv(indio_dev);
+	struct ad9523_platform_data *pdata = st->pdata;
+	struct ad9523_channel_spec	*chan;
+	unsigned active_mask = 0;
+	int ret, i;
+
+	ret = ad9523_write(indio_dev, AD9523_SERIAL_PORT_CONFIG,
+			   AD9523_SER_CONF_SOFT_RESET |
+			  (st->spi->mode & SPI_3WIRE ? 0 :
+			  AD9523_SER_CONF_SDO_ACTIVE));
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_READBACK_CTRL,
+			  AD9523_READBACK_CTRL_READ_BUFFERED);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_io_update(indio_dev);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * PLL1 Setup
+	 */
+	ret = ad9523_write(indio_dev, AD9523_PLL1_REF_A_DIVIDER,
+		pdata->refa_r_div);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL1_REF_B_DIVIDER,
+		pdata->refb_r_div);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL1_FEEDBACK_DIVIDER,
+		pdata->pll1_feedback_div);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL1_CHARGE_PUMP_CTRL,
+		AD9523_PLL1_CHARGE_PUMP_CURRENT_nA(pdata->
+			pll1_charge_pump_current_nA) |
+		AD9523_PLL1_CHARGE_PUMP_MODE_NORMAL |
+		AD9523_PLL1_BACKLASH_PW_MIN);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL1_INPUT_RECEIVERS_CTRL,
+		AD_IF(refa_diff_rcv_en, AD9523_PLL1_REFA_RCV_EN) |
+		AD_IF(refb_diff_rcv_en, AD9523_PLL1_REFB_RCV_EN) |
+		AD_IF(osc_in_diff_en, AD9523_PLL1_OSC_IN_DIFF_EN) |
+		AD_IF(osc_in_cmos_neg_inp_en,
+		      AD9523_PLL1_OSC_IN_CMOS_NEG_INP_EN) |
+		AD_IF(refa_diff_rcv_en, AD9523_PLL1_REFA_DIFF_RCV_EN) |
+		AD_IF(refb_diff_rcv_en, AD9523_PLL1_REFB_DIFF_RCV_EN));
+	if (ret < 0)
+		return ret;
+
+
+	ret = ad9523_write(indio_dev, AD9523_PLL1_REF_CTRL,
+		AD_IF(zd_in_diff_en, AD9523_PLL1_ZD_IN_DIFF_EN) |
+		AD_IF(zd_in_cmos_neg_inp_en,
+		      AD9523_PLL1_ZD_IN_CMOS_NEG_INP_EN) |
+		AD_IF(zero_delay_mode_internal_en,
+		      AD9523_PLL1_ZERO_DELAY_MODE_INT) |
+		AD_IF(osc_in_feedback_en, AD9523_PLL1_OSC_IN_PLL_FEEDBACK_EN) |
+		AD_IF(refa_cmos_neg_inp_en, AD9523_PLL1_REFA_CMOS_NEG_INP_EN) |
+		AD_IF(refb_cmos_neg_inp_en, AD9523_PLL1_REFB_CMOS_NEG_INP_EN));
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL1_MISC_CTRL,
+		AD9523_PLL1_REFB_INDEP_DIV_CTRL_EN |
+		AD9523_PLL1_REF_MODE(pdata->ref_mode));
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL1_LOOP_FILTER_CTRL,
+		AD9523_PLL1_LOOP_FILTER_RZERO(pdata->pll1_loop_filter_rzero));
+	if (ret < 0)
+		return ret;
+	/*
+	 * PLL2 Setup
+	 */
+
+	ret = ad9523_write(indio_dev, AD9523_PLL2_CHARGE_PUMP,
+		AD9523_PLL2_CHARGE_PUMP_CURRENT_nA(pdata->
+			pll2_charge_pump_current_nA));
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL2_FEEDBACK_DIVIDER_AB,
+		AD9523_PLL2_FB_NDIV_A_CNT(pdata->pll2_ndiv_a_cnt) |
+		AD9523_PLL2_FB_NDIV_B_CNT(pdata->pll2_ndiv_b_cnt));
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL2_CTRL,
+		AD9523_PLL2_CHARGE_PUMP_MODE_NORMAL |
+		AD9523_PLL2_BACKLASH_CTRL_EN |
+		AD_IF(pll2_freq_doubler_en, AD9523_PLL2_FREQ_DOUBLER_EN));
+	if (ret < 0)
+		return ret;
+
+	st->vco_freq = (pdata->vcxo_freq * (pdata->pll2_freq_doubler_en ? 2 : 1)
+			/ pdata->pll2_r2_div) * AD9523_PLL2_FB_NDIV(pdata->
+			pll2_ndiv_a_cnt, pdata->pll2_ndiv_b_cnt);
+
+	ret = ad9523_write(indio_dev, AD9523_PLL2_VCO_CTRL,
+		AD9523_PLL2_VCO_CALIBRATE);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL2_VCO_DIVIDER,
+		AD9523_PLL2_VCO_DIV_M1(pdata->pll2_vco_diff_m1) |
+		AD9523_PLL2_VCO_DIV_M2(pdata->pll2_vco_diff_m2) |
+		AD_IFE(pll2_vco_diff_m1, 0,
+		       AD9523_PLL2_VCO_DIV_M1_PWR_DOWN_EN) |
+		AD_IFE(pll2_vco_diff_m2, 0,
+		       AD9523_PLL2_VCO_DIV_M2_PWR_DOWN_EN));
+	if (ret < 0)
+		return ret;
+
+	if (pdata->pll2_vco_diff_m1)
+		st->vco_out_freq[AD9523_VCO1] =
+			st->vco_freq / pdata->pll2_vco_diff_m1;
+
+	if (pdata->pll2_vco_diff_m2)
+		st->vco_out_freq[AD9523_VCO2] =
+			st->vco_freq / pdata->pll2_vco_diff_m2;
+
+	st->vco_out_freq[AD9523_VCXO] = pdata->vcxo_freq;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL2_R2_DIVIDER,
+		AD9523_PLL2_R2_DIVIDER_VAL(pdata->pll2_r2_div));
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_PLL2_LOOP_FILTER_CTRL,
+		AD9523_PLL2_LOOP_FILTER_CPOLE1(pdata->cpole1) |
+		AD9523_PLL2_LOOP_FILTER_RZERO(pdata->rzero) |
+		AD9523_PLL2_LOOP_FILTER_RPOLE2(pdata->rpole2) |
+		AD_IF(rzero_bypass_en,
+		      AD9523_PLL2_LOOP_FILTER_RZERO_BYPASS_EN));
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < pdata->num_channels; i++) {
+		chan = &pdata->channels[i];
+		if (chan->channel_num < AD9523_NUM_CHAN) {
+			active_mask |= (1 << chan->channel_num);
+			ret = ad9523_write(indio_dev,
+				AD9523_CHANNEL_CLOCK_DIST(chan->channel_num),
+				AD9523_CLK_DIST_DRIVER_MODE(chan->driver_mode) |
+				AD9523_CLK_DIST_DIV(chan->channel_divider) |
+				AD9523_CLK_DIST_DIV_PHASE(chan->divider_phase) |
+				(chan->sync_ignore_en ?
+					AD9523_CLK_DIST_IGNORE_SYNC_EN : 0) |
+				(chan->divider_output_invert_en ?
+					AD9523_CLK_DIST_INV_DIV_OUTPUT_EN : 0) |
+				(chan->low_power_mode_en ?
+					AD9523_CLK_DIST_LOW_PWR_MODE_EN : 0) |
+				(chan->output_dis ?
+					AD9523_CLK_DIST_PWR_DOWN_EN : 0));
+			if (ret < 0)
+				return ret;
+
+			ret = ad9523_vco_out_map(indio_dev, chan->channel_num,
+					   chan->use_alt_clock_src);
+			if (ret < 0)
+				return ret;
+
+			st->ad9523_channels[i].type = IIO_ALTVOLTAGE;
+			st->ad9523_channels[i].output = 1;
+			st->ad9523_channels[i].indexed = 1;
+			st->ad9523_channels[i].channel = chan->channel_num;
+			st->ad9523_channels[i].extend_name =
+				chan->extended_name;
+			st->ad9523_channels[i].info_mask =
+				IIO_CHAN_INFO_RAW |
+				IIO_CHAN_INFO_PHASE_SEPARATE_BIT |
+				IIO_CHAN_INFO_FREQUENCY_SEPARATE_BIT;
+		}
+	}
+
+	for (i = 0; i < AD9523_NUM_CHAN; i++)
+		if (!(active_mask & (1 << i)))
+			ad9523_write(indio_dev,
+				     AD9523_CHANNEL_CLOCK_DIST(i),
+				     AD9523_CLK_DIST_DRIVER_MODE(TRISTATE) |
+				     AD9523_CLK_DIST_PWR_DOWN_EN);
+
+	ret = ad9523_write(indio_dev, AD9523_POWER_DOWN_CTRL, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_write(indio_dev, AD9523_STATUS_SIGNALS,
+			   AD9523_STATUS_MONITOR_01_PLL12_LOCKED);
+	if (ret < 0)
+		return ret;
+
+	ret = ad9523_io_update(indio_dev);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int __devinit ad9523_probe(struct spi_device *spi)
+{
+	struct ad9523_platform_data *pdata = spi->dev.platform_data;
+	struct iio_dev *indio_dev;
+	struct ad9523_state *st;
+	int ret;
+
+	if (!pdata) {
+		dev_err(&spi->dev, "no platform data?\n");
+		return -EINVAL;
+	}
+
+	indio_dev = iio_device_alloc(sizeof(*st));
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+
+	st->reg = regulator_get(&spi->dev, "vcc");
+	if (!IS_ERR(st->reg)) {
+		ret = regulator_enable(st->reg);
+		if (ret)
+			goto error_put_reg;
+	}
+
+	spi_set_drvdata(spi, indio_dev);
+	st->spi = spi;
+	st->pdata = pdata;
+
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->name = (pdata->name[0] != 0) ? pdata->name :
+			  spi_get_device_id(spi)->name;
+	indio_dev->info = &ad9523_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = st->ad9523_channels;
+	indio_dev->num_channels = pdata->num_channels;
+
+	ret = ad9523_setup(indio_dev);
+	if (ret < 0)
+		goto error_disable_reg;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_disable_reg;
+
+	dev_info(&spi->dev, "probed %s\n", indio_dev->name);
+
+	return 0;
+
+error_disable_reg:
+	if (!IS_ERR(st->reg))
+		regulator_disable(st->reg);
+error_put_reg:
+	if (!IS_ERR(st->reg))
+		regulator_put(st->reg);
+
+	iio_device_free(indio_dev);
+
+	return ret;
+}
+
+static int __devexit ad9523_remove(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev = spi_get_drvdata(spi);
+	struct ad9523_state *st = iio_priv(indio_dev);
+	struct regulator *reg = st->reg;
+
+	iio_device_unregister(indio_dev);
+
+	if (!IS_ERR(reg)) {
+		regulator_disable(reg);
+		regulator_put(reg);
+	}
+
+	iio_device_free(indio_dev);
+
+	return 0;
+}
+
+static const struct spi_device_id ad9523_id[] = {
+	{"ad9523", 9523},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, ad9523_id);
+
+static struct spi_driver ad9523_driver = {
+	.driver = {
+		.name	= "ad9523",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= ad9523_probe,
+	.remove		= __devexit_p(ad9523_remove),
+	.id_table	= ad9523_id,
+};
+module_spi_driver(ad9523_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@xxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices AD9523 CLOCKDIST/PLL");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/frequency/ad9523.h b/drivers/staging/iio/frequency/ad9523.h
new file mode 100644
index 0000000..17bba03
--- /dev/null
+++ b/drivers/staging/iio/frequency/ad9523.h
@@ -0,0 +1,112 @@
+/*
+ * AD9523 SPI Low Jitter Clock Generator
+ *
+ * Copyright 2012 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef IIO_PLL_AD9523_H_
+#define IIO_PLL_AD9523_H_
+
+/*
+ * TODO: move to include/linux/iio
+ */
+
+enum outp_drv_mode {
+	TRISTATE,
+	LVPECL_8mA,
+	LVDS_4mA,
+	LVDS_7mA,
+	HSTL0_16mA,
+	HSTL1_8mA,
+	CMOS_CONF1,
+	CMOS_CONF2,
+	CMOS_CONF3,
+	CMOS_CONF4,
+	CMOS_CONF5,
+	CMOS_CONF6,
+	CMOS_CONF7,
+	CMOS_CONF8,
+	CMOS_CONF9
+};
+
+enum ref_sel_mode {
+	NONEREVERTIVE_STAY_ON_REFB,
+	REVERT_TO_REFA,
+	SELECT_REFA,
+	SELECT_REFB,
+	EXT_REF_SEL
+};
+
+struct ad9523_channel_spec {
+	unsigned		channel_num;
+	bool			divider_output_invert_en;
+	bool			sync_ignore_en;
+	bool			low_power_mode_en;
+				 /* CH0..CH3 VCXO, CH4..CH9 VCO2 */
+	bool			use_alt_clock_src;
+	bool			output_dis;
+	enum outp_drv_mode	driver_mode;
+	unsigned char		divider_phase;
+	unsigned short		channel_divider;
+	char			extended_name[16];
+};
+
+/*
+ * struct ad9523_platform_data - platform specific information
+ */
+
+struct ad9523_platform_data {
+	unsigned long vcxo_freq;
+
+	/* Differential/ Single-Ended Input Configuration */
+	bool		refa_diff_rcv_en;
+	bool		refb_diff_rcv_en;
+	bool		zd_in_diff_en;
+	bool		osc_in_diff_en;
+
+	/*
+	 * Valid if differential input disabled
+	 * if not true defaults to pos input
+	 */
+	bool		refa_cmos_neg_inp_en;
+	bool		refb_cmos_neg_inp_en;
+	bool		zd_in_cmos_neg_inp_en;
+	bool		osc_in_cmos_neg_inp_en;
+
+	/* PLL1 Setting */
+	unsigned short	refa_r_div;
+	unsigned short	refb_r_div;
+	unsigned short	pll1_feedback_div;
+	unsigned short	pll1_charge_pump_current_nA;
+	bool		zero_delay_mode_internal_en;
+	bool		osc_in_feedback_en;
+	unsigned char	pll1_loop_filter_rzero;
+
+	/* Reference */
+	enum ref_sel_mode	ref_mode;
+
+	/* PLL2 Setting */
+	unsigned int	pll2_charge_pump_current_nA;
+	unsigned char	pll2_ndiv_a_cnt;
+	unsigned char	pll2_ndiv_b_cnt;
+	bool		pll2_freq_doubler_en;
+	unsigned char	pll2_r2_div;
+	unsigned char	pll2_vco_diff_m1; /* 3..5 */
+	unsigned char	pll2_vco_diff_m2; /* 3..5 */
+
+	/* Loop Filter PLL2 */
+	unsigned char	rpole2;
+	unsigned char	rzero;
+	unsigned char	cpole1;
+	bool		rzero_bypass_en;
+
+	/* Output Channel Configuration */
+	int		num_channels;
+	struct ad9523_channel_spec	*channels;
+
+	char		name[SPI_NAME_SIZE];
+};
+
+#endif /* IIO_PLL_AD9523_H_ */
-- 
1.7.0.4


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