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Subject[PATCH v3 1/3] iio: frequency: adf4360: Add support for ADF4360 PLLs
Date
From: Edward Kigwana <ekigwana@gmail.com>

The ADF4360-N (N is 0..9) are a family of integrated integer-N synthesizer
and voltage controlled oscillator (VCO).

Control of all the on-chip registers is through a simple 3-wire SPI
interface. The device operates with a power supply ranging from 3.0 V to
3.6 V and can be powered down when not in use.

The initial draft-work was done by Lars-Peter Clausen <lars@metafoo.de>
The current/latest/complete version was implemented by
Edward Kigwana <ekigwana@gmail.com>.

The ADF4360-9 is also present on the Analog Devices 'Advanced Active
Learning Module 2000' (ADALM-2000).

Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-0.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-1.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-2.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-3.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-4.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-5.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-6.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-7.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-8.pdf
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/ADF4360-9.pdf
Link: https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/ADALM2000.html

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Edward Kigwana <ekigwana@gmail.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---

Changelog v2 -> v3:
* dropped patch about adf4371.yaml; added by accident since it was used to
compare against
* addressed Rob's review comments for DT schema

Changelog v1 -> v2:
* validate dt-bindings file with
make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/iio/frequency/adi,adf4360.yaml

drivers/iio/frequency/Kconfig | 11 +
drivers/iio/frequency/Makefile | 1 +
drivers/iio/frequency/adf4360.c | 1263 +++++++++++++++++++++++++++++++
3 files changed, 1275 insertions(+)
create mode 100644 drivers/iio/frequency/adf4360.c

diff --git a/drivers/iio/frequency/Kconfig b/drivers/iio/frequency/Kconfig
index 240b81502512..781236496661 100644
--- a/drivers/iio/frequency/Kconfig
+++ b/drivers/iio/frequency/Kconfig
@@ -39,6 +39,17 @@ config ADF4350
To compile this driver as a module, choose M here: the
module will be called adf4350.

+config ADF4360
+ tristate "Analog Devices ADF4360 Wideband Synthesizers"
+ depends on SPI
+ depends on COMMON_CLK
+ help
+ Say yes here to build support for Analog Devices ADF4360
+ Wideband Synthesizers. The driver provides direct access via sysfs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called adf4360.
+
config ADF4371
tristate "Analog Devices ADF4371/ADF4372 Wideband Synthesizers"
depends on SPI
diff --git a/drivers/iio/frequency/Makefile b/drivers/iio/frequency/Makefile
index 518b1e50caef..85f2f81da662 100644
--- a/drivers/iio/frequency/Makefile
+++ b/drivers/iio/frequency/Makefile
@@ -6,4 +6,5 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_AD9523) += ad9523.o
obj-$(CONFIG_ADF4350) += adf4350.o
+obj-$(CONFIG_ADF4360) += adf4360.o
obj-$(CONFIG_ADF4371) += adf4371.o
diff --git a/drivers/iio/frequency/adf4360.c b/drivers/iio/frequency/adf4360.c
new file mode 100644
index 000000000000..49ad58092171
--- /dev/null
+++ b/drivers/iio/frequency/adf4360.c
@@ -0,0 +1,1263 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ADF4360 PLL with Integrated Synthesizer and VCO
+ *
+ * Copyright 2014-2019 Analog Devices Inc.
+ * Copyright 2019-2020 Edward Kigwana.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/util_macros.h>
+
+#include <linux/iio/iio.h>
+
+/* Register address macro */
+#define ADF4360_REG(x) (x)
+
+/* ADF4360_CTRL */
+#define ADF4360_ADDR_CPL_MSK GENMASK(3, 2)
+#define ADF4360_CPL(x) FIELD_PREP(ADF4360_ADDR_CPL_MSK, x)
+#define ADF4360_ADDR_MUXOUT_MSK GENMASK(7, 5)
+#define ADF4360_MUXOUT(x) FIELD_PREP(ADF4360_ADDR_MUXOUT_MSK, x)
+#define ADF4360_ADDR_PDP_MSK BIT(8)
+#define ADF4360_PDP(x) FIELD_PREP(ADF4360_ADDR_PDP_MSK, x)
+#define ADF4360_ADDR_MTLD_MSK BIT(11)
+#define ADF4360_MTLD(x) FIELD_PREP(ADF4360_ADDR_MTLD_MSK, x)
+#define ADF4360_ADDR_OPL_MSK GENMASK(13, 12)
+#define ADF4360_OPL(x) FIELD_PREP(ADF4360_ADDR_OPL_MSK, x)
+#define ADF4360_ADDR_CPI1_MSK GENMASK(16, 14)
+#define ADF4360_CPI1(x) FIELD_PREP(ADF4360_ADDR_CPI1_MSK, x)
+#define ADF4360_ADDR_CPI2_MSK GENMASK(19, 17)
+#define ADF4360_CPI2(x) FIELD_PREP(ADF4360_ADDR_CPI2_MSK, x)
+#define ADF4360_ADDR_PWR_DWN_MSK GENMASK(21, 20)
+#define ADF4360_POWERDOWN(x) FIELD_PREP(ADF4360_ADDR_PWR_DWN_MSK, x)
+#define ADF4360_ADDR_PRESCALER_MSK GENMASK(23, 22)
+#define ADF4360_PRESCALER(x) FIELD_PREP(ADF4360_ADDR_PRESCALER_MSK, x)
+
+/* ADF4360_NDIV */
+#define ADF4360_ADDR_A_CNTR_MSK GENMASK(6, 2)
+#define ADF4360_A_COUNTER(x) FIELD_PREP(ADF4360_ADDR_A_CNTR_MSK, x)
+#define ADF4360_ADDR_B_CNTR_MSK GENMASK(20, 8)
+#define ADF4360_B_COUNTER(x) FIELD_PREP(ADF4360_ADDR_B_CNTR_MSK, x)
+#define ADF4360_ADDR_OUT_DIV2_MSK BIT(22)
+#define ADF4360_OUT_DIV2(x) FIELD_PREP(ADF4360_ADDR_OUT_DIV2_MSK, x)
+#define ADF4360_ADDR_DIV2_SEL_MSK BIT(23)
+#define ADF4360_PRESCALER_DIV2(x) FIELD_PREP(ADF4360_ADDR_DIV2_SEL_MSK, x)
+
+/* ADF4360_RDIV */
+#define ADF4360_ADDR_R_CNTR_MSK GENMASK(15, 2)
+#define ADF4360_R_COUNTER(x) FIELD_PREP(ADF4360_ADDR_R_CNTR_MSK, x)
+#define ADF4360_ADDR_ABP_MSK GENMASK(17, 16)
+#define ADF4360_ABP(x) FIELD_PREP(ADF4360_ADDR_ABP_MSK, x)
+#define ADF4360_ADDR_BSC_MSK GENMASK(21, 20)
+#define ADF4360_BSC(x) FIELD_PREP(ADF4360_ADDR_BSC_MSK, x)
+
+/* Specifications */
+#define ADF4360_MAX_PFD_RATE 8000000 /* 8 MHz */
+#define ADF4360_MAX_COUNTER_RATE 300000000 /* 300 MHz */
+#define ADF4360_MAX_REFIN_RATE 250000000 /* 250 MHz */
+
+enum {
+ ADF4360_CTRL,
+ ADF4360_RDIV,
+ ADF4360_NDIV,
+ ADF4360_REG_NUM,
+};
+
+enum {
+ ADF4360_GEN1_PC_5,
+ ADF4360_GEN1_PC_10,
+ ADF4360_GEN1_PC_15,
+ ADF4360_GEN1_PC_20,
+};
+
+enum {
+ ADF4360_GEN2_PC_2_5,
+ ADF4360_GEN2_PC_5,
+ ADF4360_GEN2_PC_7_5,
+ ADF4360_GEN2_PC_10,
+};
+
+enum {
+ ADF4360_MUXOUT_THREE_STATE,
+ ADF4360_MUXOUT_LOCK_DETECT,
+ ADF4360_MUXOUT_NDIV,
+ ADF4360_MUXOUT_DVDD,
+ ADF4360_MUXOUT_RDIV,
+ ADF4360_MUXOUT_OD_LD,
+ ADF4360_MUXOUT_SDO,
+ ADF4360_MUXOUT_GND,
+};
+
+enum {
+ ADF4360_PL_3_5,
+ ADF4360_PL_5,
+ ADF4360_PL_7_5,
+ ADF4360_PL_11,
+};
+
+enum {
+ ADF4360_CPI_0_31,
+ ADF4360_CPI_0_62,
+ ADF4360_CPI_0_93,
+ ADF4360_CPI_1_25,
+ ADF4360_CPI_1_56,
+ ADF4360_CPI_1_87,
+ ADF4360_CPI_2_18,
+ ADF4360_CPI_2_50,
+};
+
+enum {
+ ADF4360_POWER_DOWN_NORMAL,
+ ADF4360_POWER_DOWN_SOFT_ASYNC,
+ ADF4360_POWER_DOWN_CE,
+ ADF4360_POWER_DOWN_SOFT_SYNC,
+ ADF4360_POWER_DOWN_REGULATOR,
+};
+
+enum {
+ ADF4360_PRESCALER_8,
+ ADF4360_PRESCALER_16,
+ ADF4360_PRESCALER_32,
+};
+
+enum {
+ ADF4360_ABP_3_0NS,
+ ADF4360_ABP_1_3NS,
+ ADF4360_ABP_6_0NS,
+};
+
+enum {
+ ADF4360_BSC_1,
+ ADF4360_BSC_2,
+ ADF4360_BSC_4,
+ ADF4360_BSC_8,
+};
+
+enum {
+ ID_ADF4360_0,
+ ID_ADF4360_1,
+ ID_ADF4360_2,
+ ID_ADF4360_3,
+ ID_ADF4360_4,
+ ID_ADF4360_5,
+ ID_ADF4360_6,
+ ID_ADF4360_7,
+ ID_ADF4360_8,
+ ID_ADF4360_9,
+};
+
+enum {
+ ADF4360_FREQ_REFIN,
+ ADF4360_MTLD,
+ ADF4360_FREQ_PFD,
+};
+
+static const char * const adf4360_power_level_modes[] = {
+ [ADF4360_PL_3_5] = "3500-uA",
+ [ADF4360_PL_5] = "5000-uA",
+ [ADF4360_PL_7_5] = "7500-uA",
+ [ADF4360_PL_11] = "11000-uA",
+};
+
+static const unsigned int adf4360_power_lvl_microamp[] = {
+ [ADF4360_PL_3_5] = 3500,
+ [ADF4360_PL_5] = 5000,
+ [ADF4360_PL_7_5] = 7500,
+ [ADF4360_PL_11] = 11000,
+};
+
+static const unsigned int adf4360_cpi_modes[] = {
+ [ADF4360_CPI_0_31] = 310,
+ [ADF4360_CPI_0_62] = 620,
+ [ADF4360_CPI_0_93] = 930,
+ [ADF4360_CPI_1_25] = 1250,
+ [ADF4360_CPI_1_56] = 1560,
+ [ADF4360_CPI_1_87] = 1870,
+ [ADF4360_CPI_2_18] = 2180,
+ [ADF4360_CPI_2_50] = 2500,
+};
+
+static const char * const adf4360_muxout_modes[] = {
+ [ADF4360_MUXOUT_THREE_STATE] = "three-state",
+ [ADF4360_MUXOUT_LOCK_DETECT] = "lock-detect",
+ [ADF4360_MUXOUT_NDIV] = "ndiv",
+ [ADF4360_MUXOUT_DVDD] = "dvdd",
+ [ADF4360_MUXOUT_RDIV] = "rdiv",
+ [ADF4360_MUXOUT_OD_LD] = "od-ld",
+ [ADF4360_MUXOUT_SDO] = "sdo",
+ [ADF4360_MUXOUT_GND] = "gnd",
+};
+
+static const char * const adf4360_power_down_modes[] = {
+ [ADF4360_POWER_DOWN_NORMAL] = "normal",
+ [ADF4360_POWER_DOWN_SOFT_ASYNC] = "soft-async",
+ [ADF4360_POWER_DOWN_CE] = "ce",
+ [ADF4360_POWER_DOWN_SOFT_SYNC] = "soft-sync",
+ [ADF4360_POWER_DOWN_REGULATOR] = "regulator",
+};
+
+struct adf4360_output {
+ struct clk_hw hw;
+ struct iio_dev *indio_dev;
+};
+
+#define to_output(_hw) container_of(_hw, struct adf4360_output, hw)
+
+struct adf4360_chip_info {
+ unsigned int vco_min;
+ unsigned int vco_max;
+ unsigned int default_cpl;
+};
+
+struct adf4360_state {
+ struct spi_device *spi;
+ const struct adf4360_chip_info *info;
+ struct adf4360_output output;
+ struct clk *clkin;
+ struct gpio_desc *muxout_gpio;
+ struct gpio_desc *chip_en_gpio;
+ struct regulator *vdd_reg;
+ struct mutex lock; /* Protect PLL state. */
+ unsigned int part_id;
+ unsigned long clkin_freq;
+ unsigned long freq_req;
+ unsigned long r;
+ unsigned long n;
+ unsigned int vco_min;
+ unsigned int vco_max;
+ unsigned int pfd_freq;
+ unsigned int cpi;
+ bool pdp;
+ bool mtld;
+ unsigned int power_level;
+ unsigned int muxout_mode;
+ unsigned int power_down_mode;
+ bool initial_reg_seq;
+ const char *clk_out_name;
+ unsigned int regs[ADF4360_REG_NUM];
+ u8 spi_data[3] ____cacheline_aligned;
+};
+
+static const struct adf4360_chip_info adf4360_chip_info_tbl[] = {
+ { /* ADF4360-0 */
+ .vco_min = 2400000000U,
+ .vco_max = 2725000000U,
+ .default_cpl = ADF4360_GEN1_PC_10,
+ }, { /* ADF4360-1 */
+ .vco_min = 2050000000U,
+ .vco_max = 2450000000U,
+ .default_cpl = ADF4360_GEN1_PC_15,
+ }, { /* ADF4360-2 */
+ .vco_min = 1850000000U,
+ .vco_max = 2170000000U,
+ .default_cpl = ADF4360_GEN1_PC_15,
+ }, { /* ADF4360-3 */
+ .vco_min = 1600000000U,
+ .vco_max = 1950000000U,
+ .default_cpl = ADF4360_GEN1_PC_15,
+ }, { /* ADF4360-4 */
+ .vco_min = 1450000000U,
+ .vco_max = 1750000000U,
+ .default_cpl = ADF4360_GEN1_PC_15,
+ }, { /* ADF4360-5 */
+ .vco_min = 1200000000U,
+ .vco_max = 1400000000U,
+ .default_cpl = ADF4360_GEN1_PC_10,
+ }, { /* ADF4360-6 */
+ .vco_min = 1050000000U,
+ .vco_max = 1250000000U,
+ .default_cpl = ADF4360_GEN1_PC_10,
+ }, { /* ADF4360-7 */
+ .vco_min = 350000000U,
+ .vco_max = 1800000000U,
+ .default_cpl = ADF4360_GEN1_PC_5,
+ }, { /* ADF4360-8 */
+ .vco_min = 65000000U,
+ .vco_max = 400000000U,
+ .default_cpl = ADF4360_GEN2_PC_5,
+ }, { /* ADF4360-9 */
+ .vco_min = 65000000U,
+ .vco_max = 400000000U,
+ .default_cpl = ADF4360_GEN2_PC_5,
+ }
+};
+
+static int adf4360_write_reg(struct adf4360_state *st, unsigned int reg,
+ unsigned int val)
+{
+ int ret;
+
+ val |= reg;
+
+ st->spi_data[0] = (val >> 16) & 0xff;
+ st->spi_data[1] = (val >> 8) & 0xff;
+ st->spi_data[2] = val & 0xff;
+
+ ret = spi_write(st->spi, st->spi_data, ARRAY_SIZE(st->spi_data));
+ if (ret == 0)
+ st->regs[reg] = val;
+
+ return ret;
+}
+
+/* fVCO = B * fREFIN / R */
+
+static unsigned long adf4360_clk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ if (st->r == 0)
+ return 0;
+
+ /*
+ * The result is guaranteed to fit in 32-bit, but the intermediate
+ * result might require 64-bit.
+ */
+ return DIV_ROUND_CLOSEST_ULL((uint64_t)parent_rate * st->n, st->r);
+}
+
+static unsigned int adf4360_calc_prescaler(unsigned int pfd_freq,
+ unsigned int n,
+ unsigned int *out_p,
+ unsigned int *out_a,
+ unsigned int *out_b)
+{
+ unsigned int rate = pfd_freq * n;
+ unsigned int p, a, b;
+
+ /* Make sure divider counter input frequency is low enough */
+ p = 8;
+ while (p < 32 && rate / p > ADF4360_MAX_COUNTER_RATE)
+ p *= 2;
+
+ /*
+ * The range of dividers that can be produced using the dual-modulus
+ * pre-scaler is not continuous for values of n < p*(p-1). If we end up
+ * with a non supported divider value, pick the next closest one.
+ */
+ a = n % p;
+ b = n / p;
+
+ if (b < 3) {
+ b = 3;
+ a = 0;
+ } else if (a > b) {
+ if (a - b < p - a) {
+ a = b;
+ } else {
+ a = 0;
+ b++;
+ }
+ }
+
+ if (out_p)
+ *out_p = p;
+ if (out_a)
+ *out_a = a;
+ if (out_b)
+ *out_b = b;
+
+ return p * b + a;
+}
+
+static long adf4360_clk_round_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+ unsigned int r, n;
+ unsigned int pfd_freq;
+
+ if (*parent_rate == 0)
+ return 0;
+
+ if (st->part_id == ID_ADF4360_9)
+ return *parent_rate * st->n / st->r;
+
+ if (rate > st->vco_max)
+ return st->vco_max;
+
+ /* ADF4360-0 to AD4370-7 have an optional by two divider */
+ if (st->part_id <= ID_ADF4360_7) {
+ if (rate < st->vco_min / 2)
+ return st->vco_min / 2;
+ if (rate < st->vco_min && rate > st->vco_max / 2) {
+ if (st->vco_min - rate < rate - st->vco_max / 2)
+ return st->vco_min;
+ else
+ return st->vco_max / 2;
+ }
+ } else {
+ if (rate < st->vco_min)
+ return st->vco_min;
+ }
+
+ r = DIV_ROUND_CLOSEST(*parent_rate, st->pfd_freq);
+ pfd_freq = *parent_rate / r;
+ n = DIV_ROUND_CLOSEST(rate, pfd_freq);
+
+ if (st->part_id <= ID_ADF4360_7)
+ n = adf4360_calc_prescaler(pfd_freq, n, NULL, NULL, NULL);
+
+ return pfd_freq * n;
+}
+
+static inline bool adf4360_is_powerdown(struct adf4360_state *st)
+{
+ return (st->power_down_mode != ADF4360_POWER_DOWN_NORMAL);
+}
+
+static int adf4360_set_freq(struct adf4360_state *st, unsigned long rate)
+{
+ unsigned int val_r, val_n, val_ctrl;
+ unsigned int pfd_freq;
+ unsigned long r, n;
+ int ret;
+
+ if (!st->clkin_freq || (st->clkin_freq > ADF4360_MAX_REFIN_RATE))
+ return -EINVAL;
+
+ if ((rate < st->vco_min) || (rate > st->vco_max))
+ return -EINVAL;
+
+ if (adf4360_is_powerdown(st))
+ ret = -EBUSY;
+
+ r = DIV_ROUND_CLOSEST(st->clkin_freq, st->pfd_freq);
+ pfd_freq = st->clkin_freq / r;
+ n = DIV_ROUND_CLOSEST(rate, pfd_freq);
+
+ val_ctrl = ADF4360_CPL(st->info->default_cpl) |
+ ADF4360_MUXOUT(st->muxout_mode) |
+ ADF4360_PDP(!st->pdp) |
+ ADF4360_MTLD(st->mtld) |
+ ADF4360_OPL(st->power_level) |
+ ADF4360_CPI1(st->cpi) |
+ ADF4360_CPI2(st->cpi) |
+ ADF4360_POWERDOWN(st->power_down_mode);
+
+ /* ADF4360-0 to ADF4360-7 have a dual-modulous prescaler */
+ if (st->part_id <= ID_ADF4360_7) {
+ unsigned int p, a, b;
+
+ n = adf4360_calc_prescaler(pfd_freq, n, &p, &a, &b);
+
+ switch (p) {
+ case 8:
+ val_ctrl |= ADF4360_PRESCALER(ADF4360_PRESCALER_8);
+ break;
+ case 16:
+ val_ctrl |= ADF4360_PRESCALER(ADF4360_PRESCALER_16);
+ break;
+ default:
+ val_ctrl |= ADF4360_PRESCALER(ADF4360_PRESCALER_32);
+ break;
+ }
+
+ val_n = ADF4360_A_COUNTER(a) |
+ ADF4360_B_COUNTER(b);
+
+ if (rate < st->vco_min)
+ val_n |= ADF4360_OUT_DIV2(true) |
+ ADF4360_PRESCALER_DIV2(true);
+ } else {
+ val_n = ADF4360_B_COUNTER(n);
+ }
+
+ /*
+ * Always use BSC divider of 8, see Analog Devices AN-1347.
+ * http://www.analog.com/media/en/technical-documentation/application-notes/AN-1347.pdf
+ */
+ val_r = ADF4360_R_COUNTER(r) |
+ ADF4360_ABP(ADF4360_ABP_3_0NS) |
+ ADF4360_BSC(ADF4360_BSC_8);
+
+ ret = adf4360_write_reg(st, ADF4360_REG(ADF4360_RDIV), val_r);
+ if (ret)
+ return ret;
+
+ ret = adf4360_write_reg(st, ADF4360_REG(ADF4360_CTRL), val_ctrl);
+ if (ret)
+ return ret;
+
+ /*
+ * Allow the transient behavior of the ADF4360-7 during initial
+ * power-up to settle.
+ */
+ if (st->initial_reg_seq) {
+ usleep_range(15000, 20000);
+ st->initial_reg_seq = false;
+ }
+
+ ret = adf4360_write_reg(st, ADF4360_REG(ADF4360_NDIV), val_n);
+ if (ret)
+ return ret;
+
+ st->freq_req = rate;
+ st->n = n;
+ st->r = r;
+
+ return 0;
+}
+
+static int adf4360_clk_set_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if ((parent_rate == 0) || (parent_rate > ADF4360_MAX_REFIN_RATE))
+ return -EINVAL;
+
+ mutex_lock(&st->lock);
+ if (st->clkin_freq != parent_rate)
+ st->clkin_freq = parent_rate;
+
+ ret = adf4360_set_freq(st, rate);
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static int __adf4360_power_down(struct adf4360_state *st, unsigned int mode)
+{
+ struct device *dev = &st->spi->dev;
+ unsigned int val;
+ int ret = 0;
+
+ switch (mode) {
+ case ADF4360_POWER_DOWN_NORMAL:
+ if (st->vdd_reg) {
+ ret = regulator_enable(st->vdd_reg);
+ if (ret) {
+ dev_err(dev, "Supply enable error: %d\n", ret);
+ return ret;
+ }
+ }
+
+ st->initial_reg_seq = true;
+ st->power_down_mode = mode;
+ ret = adf4360_set_freq(st, st->freq_req);
+ break;
+ case ADF4360_POWER_DOWN_SOFT_ASYNC: /* fallthrough */
+ case ADF4360_POWER_DOWN_SOFT_SYNC:
+ val = st->regs[ADF4360_CTRL] & ~ADF4360_ADDR_MUXOUT_MSK;
+ val |= ADF4360_POWERDOWN(mode);
+ ret = adf4360_write_reg(st, ADF4360_REG(ADF4360_CTRL), val);
+ break;
+ case ADF4360_POWER_DOWN_CE:
+ if (st->chip_en_gpio)
+ gpiod_set_value(st->chip_en_gpio, 0x0);
+ else
+ return -ENODEV;
+ break;
+ case ADF4360_POWER_DOWN_REGULATOR:
+ if (!st->vdd_reg)
+ return -ENODEV;
+
+ if (st->chip_en_gpio)
+ ret = __adf4360_power_down(st, ADF4360_POWER_DOWN_CE);
+ else
+ ret = __adf4360_power_down(st,
+ ADF4360_POWER_DOWN_SOFT_ASYNC);
+
+ ret = regulator_disable(st->vdd_reg);
+ if (ret)
+ dev_err(dev, "Supply disable error: %d\n", ret);
+ break;
+ }
+ if (ret == 0)
+ st->power_down_mode = mode;
+
+ return 0;
+}
+
+static int adf4360_power_down(struct adf4360_state *st, unsigned int mode)
+{
+ int ret;
+
+ mutex_lock(&st->lock);
+ ret = __adf4360_power_down(st, mode);
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static int adf4360_clk_prepare(struct clk_hw *hw)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ return adf4360_power_down(st, ADF4360_POWER_DOWN_NORMAL);
+}
+
+static void adf4360_clk_unprepare(struct clk_hw *hw)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ adf4360_power_down(st, ADF4360_POWER_DOWN_SOFT_ASYNC);
+}
+
+static int adf4360_clk_enable(struct clk_hw *hw)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ if (st->chip_en_gpio)
+ gpiod_set_value(st->chip_en_gpio, 0x1);
+
+ return 0;
+}
+
+static void adf4360_clk_disable(struct clk_hw *hw)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ if (st->chip_en_gpio)
+ adf4360_power_down(st, ADF4360_POWER_DOWN_CE);
+}
+
+static int adf4360_clk_is_enabled(struct clk_hw *hw)
+{
+ struct iio_dev *indio_dev = to_output(hw)->indio_dev;
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ return adf4360_is_powerdown(st);
+}
+
+static const struct clk_ops adf4360_clk_ops = {
+ .recalc_rate = adf4360_clk_recalc_rate,
+ .round_rate = adf4360_clk_round_rate,
+ .set_rate = adf4360_clk_set_rate,
+ .prepare = adf4360_clk_prepare,
+ .unprepare = adf4360_clk_unprepare,
+ .enable = adf4360_clk_enable,
+ .disable = adf4360_clk_disable,
+ .is_enabled = adf4360_clk_is_enabled,
+};
+
+static ssize_t adf4360_read(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ char *buf)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+ unsigned long val;
+ int ret = 0;
+
+ switch ((u32)private) {
+ case ADF4360_FREQ_REFIN:
+ val = st->clkin_freq;
+ break;
+ case ADF4360_MTLD:
+ val = st->mtld;
+ break;
+ case ADF4360_FREQ_PFD:
+ val = st->pfd_freq;
+ break;
+ default:
+ ret = -EINVAL;
+ val = 0;
+ }
+
+ return ret < 0 ? ret : sprintf(buf, "%lu\n", val);
+}
+
+static ssize_t adf4360_write(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ const char *buf, size_t len)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+ unsigned long readin, tmp;
+ bool mtld;
+ int ret = 0;
+
+ mutex_lock(&st->lock);
+ switch ((u32)private) {
+ case ADF4360_FREQ_REFIN:
+ ret = kstrtoul(buf, 10, &readin);
+ if (ret)
+ break;
+
+ if ((readin > ADF4360_MAX_REFIN_RATE) || (readin == 0)) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (st->clkin) {
+ tmp = clk_round_rate(st->clkin, readin);
+ if (tmp != readin) {
+ ret = -EINVAL;
+ break;
+ }
+
+ ret = clk_set_rate(st->clkin, tmp);
+ if (ret)
+ break;
+ }
+
+ st->clkin_freq = readin;
+ break;
+ case ADF4360_MTLD:
+ ret = kstrtobool(buf, &mtld);
+ if (ret)
+ break;
+
+ st->mtld = mtld;
+ break;
+ case ADF4360_FREQ_PFD:
+ ret = kstrtoul(buf, 10, &readin);
+ if (ret)
+ break;
+
+ if ((readin > ADF4360_MAX_PFD_RATE) || (readin == 0)) {
+ ret = -EINVAL;
+ break;
+ }
+
+ st->pfd_freq = readin;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (ret == 0)
+ ret = adf4360_set_freq(st, st->freq_req);
+ mutex_unlock(&st->lock);
+
+ return ret ? ret : len;
+}
+
+static int adf4360_get_muxout_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ return st->muxout_mode;
+}
+
+static int adf4360_set_muxout_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int mode)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+ unsigned int writeval;
+ int ret = 0;
+
+ mutex_lock(&st->lock);
+ writeval = st->regs[ADF4360_CTRL] & ~ADF4360_ADDR_MUXOUT_MSK;
+ writeval |= ADF4360_MUXOUT(mode & 0x7);
+ ret = adf4360_write_reg(st, ADF4360_REG(ADF4360_CTRL), writeval);
+ if (ret == 0)
+ st->muxout_mode = mode & 0x7;
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static const struct iio_enum adf4360_muxout_modes_available = {
+ .items = adf4360_muxout_modes,
+ .num_items = ARRAY_SIZE(adf4360_muxout_modes),
+ .get = adf4360_get_muxout_mode,
+ .set = adf4360_set_muxout_mode,
+};
+
+static int adf4360_get_power_down(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ return st->power_down_mode;
+}
+
+static int adf4360_set_power_down(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int mode)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ return adf4360_power_down(st, mode);
+}
+
+static const struct iio_enum adf4360_pwr_dwn_modes_available = {
+ .items = adf4360_power_down_modes,
+ .num_items = ARRAY_SIZE(adf4360_power_down_modes),
+ .get = adf4360_get_power_down,
+ .set = adf4360_set_power_down,
+};
+
+static int adf4360_get_power_level(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+
+ return st->power_level;
+}
+
+static int adf4360_set_power_level(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int level)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+ unsigned int val;
+ int ret;
+
+ if (adf4360_is_powerdown(st))
+ return -EBUSY;
+
+ mutex_lock(&st->lock);
+ val = st->regs[ADF4360_CTRL] & ~ADF4360_ADDR_OPL_MSK;
+ val |= ADF4360_OPL(level);
+ ret = adf4360_write_reg(st, ADF4360_REG(ADF4360_CTRL), val);
+ st->power_level = level;
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static const struct iio_enum adf4360_pwr_lvl_modes_available = {
+ .items = adf4360_power_level_modes,
+ .num_items = ARRAY_SIZE(adf4360_power_level_modes),
+ .get = adf4360_get_power_level,
+ .set = adf4360_set_power_level,
+};
+
+#define _ADF4360_EXT_INFO(_name, _ident) { \
+ .name = _name, \
+ .read = adf4360_read, \
+ .write = adf4360_write, \
+ .private = _ident, \
+ .shared = IIO_SEPARATE, \
+}
+
+static const struct iio_chan_spec_ext_info adf4360_ext_info[] = {
+ _ADF4360_EXT_INFO("refin_frequency", ADF4360_FREQ_REFIN),
+ _ADF4360_EXT_INFO("mute_till_lock_detect", ADF4360_MTLD),
+ _ADF4360_EXT_INFO("pfd_frequency", ADF4360_FREQ_PFD),
+ IIO_ENUM_AVAILABLE("muxout_mode", &adf4360_muxout_modes_available),
+ IIO_ENUM("muxout_mode", false, &adf4360_muxout_modes_available),
+ IIO_ENUM_AVAILABLE("power_down", &adf4360_pwr_dwn_modes_available),
+ IIO_ENUM("power_down", false, &adf4360_pwr_dwn_modes_available),
+ IIO_ENUM_AVAILABLE("power_level", &adf4360_pwr_lvl_modes_available),
+ IIO_ENUM("power_level", false, &adf4360_pwr_lvl_modes_available),
+ { },
+};
+
+static const struct iio_chan_spec adf4360_chan = {
+ .type = IIO_ALTVOLTAGE,
+ .indexed = 1,
+ .output = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_FREQUENCY),
+ .ext_info = adf4360_ext_info,
+};
+
+static int adf4360_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+ bool lk_det;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_FREQUENCY:
+ if (adf4360_is_powerdown(st))
+ return -EBUSY;
+
+ lk_det = (ADF4360_MUXOUT_LOCK_DETECT | ADF4360_MUXOUT_OD_LD) &
+ st->muxout_mode;
+ if (lk_det && st->muxout_gpio) {
+ if (!gpiod_get_value(st->muxout_gpio)) {
+ dev_dbg(&st->spi->dev, "PLL un-locked\n");
+ return -EBUSY;
+ }
+ }
+
+ *val = st->freq_req;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+};
+
+static int adf4360_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&st->lock);
+ switch (mask) {
+ case IIO_CHAN_INFO_FREQUENCY:
+ ret = adf4360_set_freq(st, val);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static int adf4360_reg_access(struct iio_dev *indio_dev,
+ unsigned int reg,
+ unsigned int writeval,
+ unsigned int *readval)
+{
+ struct adf4360_state *st = iio_priv(indio_dev);
+ int ret = 0;
+
+ if (reg >= ADF4360_REG_NUM)
+ return -EFAULT;
+
+ mutex_lock(&st->lock);
+ if (readval) {
+ *readval = st->regs[reg];
+ } else {
+ writeval &= 0xFFFFFC;
+ ret = adf4360_write_reg(st, reg, writeval);
+ }
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static const struct iio_info adf4360_iio_info = {
+ .read_raw = &adf4360_read_raw,
+ .write_raw = &adf4360_write_raw,
+ .debugfs_reg_access = &adf4360_reg_access,
+};
+
+static int adf4360_get_gpio(struct adf4360_state *st)
+{
+ struct device *dev = &st->spi->dev;
+ unsigned int val;
+ int ret, i;
+
+ st->chip_en_gpio = devm_gpiod_get_optional(dev, "enable",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(st->chip_en_gpio)) {
+ dev_err(dev, "Chip enable GPIO error\n");
+ return PTR_ERR(st->chip_en_gpio);
+ }
+
+ if (st->chip_en_gpio)
+ st->power_down_mode = ADF4360_POWER_DOWN_CE;
+
+ st->muxout_gpio = devm_gpiod_get_optional(dev, "adi,muxout", GPIOD_IN);
+ if (IS_ERR(st->muxout_gpio)) {
+ dev_err(dev, "Muxout GPIO error\n");
+ return PTR_ERR(st->muxout_gpio);
+ }
+
+ if (!st->muxout_gpio)
+ return 0;
+
+ /* ADF4360 PLLs are write only devices, try to probe using GPIO. */
+ for (i = 0; i < 4; i++) {
+ if (i & 1)
+ val = ADF4360_MUXOUT(ADF4360_MUXOUT_DVDD);
+ else
+ val = ADF4360_MUXOUT(ADF4360_MUXOUT_GND);
+
+ ret = adf4360_write_reg(st, ADF4360_REG(ADF4360_CTRL), val);
+ if (ret)
+ return ret;
+
+ ret = gpiod_get_value(st->muxout_gpio);
+ if (ret ^ (i & 1)) {
+ dev_err(dev, "Probe failed (muxout)");
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static void adf4360_clkin_disable(void *data)
+{
+ struct adf4360_state *st = data;
+
+ clk_disable_unprepare(st->clkin);
+}
+
+static int adf4360_get_clkin(struct adf4360_state *st)
+{
+ struct device *dev = &st->spi->dev;
+ struct clk *clk;
+ int ret;
+
+ clk = devm_clk_get(dev, "clkin");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(dev, adf4360_clkin_disable, st);
+ if (ret)
+ return ret;
+
+ st->clkin = clk;
+ st->clkin_freq = clk_get_rate(clk);
+
+ return 0;
+}
+
+static void adf4360_clk_del_provider(void *data)
+{
+ struct adf4360_state *st = data;
+
+ of_clk_del_provider(st->spi->dev.of_node);
+}
+
+static int adf4360_clk_register(struct adf4360_state *st)
+{
+ struct spi_device *spi = st->spi;
+ struct clk_init_data init;
+ struct clk *clk;
+ const char *parent_name;
+ int ret;
+
+ parent_name = of_clk_get_parent_name(spi->dev.of_node, 0);
+ if (!parent_name)
+ return -EINVAL;
+
+ init.name = st->clk_out_name;
+ init.ops = &adf4360_clk_ops;
+ init.flags = CLK_SET_RATE_GATE;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ st->output.hw.init = &init;
+
+ clk = devm_clk_register(&spi->dev, &st->output.hw);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ ret = of_clk_add_provider(spi->dev.of_node, of_clk_src_simple_get, clk);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(&spi->dev, adf4360_clk_del_provider, st);
+}
+
+static int adf4360_parse_dt(struct adf4360_state *st)
+{
+ struct device *dev = &st->spi->dev;
+ u32 tmp;
+ int ret;
+
+ ret = device_property_read_string(dev, "clock-output-names",
+ &st->clk_out_name);
+ if ((ret < 0) && dev->of_node)
+ st->clk_out_name = dev->of_node->name;
+
+ if (st->part_id >= ID_ADF4360_7) {
+ /*
+ * ADF4360-7 to ADF4360-9 have a VCO that is tuned to a specific
+ * range using an external inductor. These properties describe
+ * the range selected by the external inductor.
+ */
+ ret = device_property_read_u32(dev,
+ "adi,vco-minimum-frequency-hz",
+ &tmp);
+ if (ret == 0)
+ st->vco_min = max(st->info->vco_min, tmp);
+ else
+ st->vco_min = st->info->vco_min;
+
+ ret = device_property_read_u32(dev,
+ "adi,vco-maximum-frequency-hz",
+ &tmp);
+ if (ret == 0)
+ st->vco_max = min(st->info->vco_max, tmp);
+ else
+ st->vco_max = st->info->vco_max;
+ } else {
+ st->vco_min = st->info->vco_min;
+ st->vco_max = st->info->vco_max;
+ }
+
+ st->pdp = device_property_read_bool(dev, "adi,loop-filter-inverting");
+
+ ret = device_property_read_u32(dev,
+ "adi,loop-filter-pfd-frequency-hz",
+ &tmp);
+ if (ret == 0) {
+ st->pfd_freq = tmp;
+ } else {
+ dev_err(dev, "PFD frequency property missing\n");
+ return ret;
+ }
+
+ ret = device_property_read_u32(dev,
+ "adi,loop-filter-charge-pump-current-microamp",
+ &tmp);
+ if (ret == 0) {
+ st->cpi = find_closest(tmp, adf4360_cpi_modes,
+ ARRAY_SIZE(adf4360_cpi_modes));
+ } else {
+ dev_err(dev, "CPI property missing\n");
+ return ret;
+ }
+
+ ret = device_property_read_u32(dev, "adi,power-up-frequency-hz", &tmp);
+ if (ret == 0)
+ st->freq_req = tmp;
+ else
+ st->freq_req = st->vco_min;
+
+ ret = device_property_read_u32(dev, "adi,power-out-level-microamp",
+ &tmp);
+ if (ret == 0)
+ st->power_level = find_closest(tmp, adf4360_power_lvl_microamp,
+ ARRAY_SIZE(adf4360_power_lvl_microamp));
+ else
+ st->power_level = ADF4360_PL_5;
+
+ return 0;
+}
+
+static int adf4360_probe(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev;
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct adf4360_state *st;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+
+ mutex_init(&st->lock);
+
+ spi_set_drvdata(spi, indio_dev);
+
+ st->spi = spi;
+ st->info = &adf4360_chip_info_tbl[id->driver_data];
+ st->part_id = id->driver_data;
+ st->muxout_mode = ADF4360_MUXOUT_LOCK_DETECT;
+ st->mtld = true;
+
+ ret = adf4360_parse_dt(st);
+ if (ret) {
+ dev_err(&spi->dev, "Parsing properties failed (%d)\n", ret);
+ return -ENODEV;
+ }
+
+ indio_dev->dev.parent = &spi->dev;
+
+ if (spi->dev.of_node)
+ indio_dev->name = spi->dev.of_node->name;
+ else
+ indio_dev->name = spi_get_device_id(spi)->name;
+
+ indio_dev->info = &adf4360_iio_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = &adf4360_chan;
+ indio_dev->num_channels = 1;
+ st->output.indio_dev = indio_dev;
+
+ ret = adf4360_get_gpio(st);
+ if (ret)
+ return ret;
+
+ ret = adf4360_get_clkin(st);
+ if (ret)
+ return ret;
+
+ st->vdd_reg = devm_regulator_get_optional(&spi->dev, "vdd");
+ if (IS_ERR(st->vdd_reg)) {
+ if (PTR_ERR(st->vdd_reg) != -ENODEV) {
+ dev_err(&spi->dev, "Regulator error\n");
+ return PTR_ERR(st->vdd_reg);
+ }
+
+ st->vdd_reg = NULL;
+ }
+
+ ret = adf4360_power_down(st, ADF4360_POWER_DOWN_NORMAL);
+ if (ret)
+ return ret;
+
+ ret = adf4360_clk_register(st);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct of_device_id adf4360_of_match[] = {
+ { .compatible = "adi,adf4360-0", },
+ { .compatible = "adi,adf4360-1", },
+ { .compatible = "adi,adf4360-2", },
+ { .compatible = "adi,adf4360-3", },
+ { .compatible = "adi,adf4360-4", },
+ { .compatible = "adi,adf4360-5", },
+ { .compatible = "adi,adf4360-6", },
+ { .compatible = "adi,adf4360-7", },
+ { .compatible = "adi,adf4360-8", },
+ { .compatible = "adi,adf4360-9", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, adf4360_of_match);
+
+static const struct spi_device_id adf4360_id[] = {
+ {"adf4360-0", ID_ADF4360_0},
+ {"adf4360-1", ID_ADF4360_1},
+ {"adf4360-2", ID_ADF4360_2},
+ {"adf4360-3", ID_ADF4360_3},
+ {"adf4360-4", ID_ADF4360_4},
+ {"adf4360-5", ID_ADF4360_5},
+ {"adf4360-6", ID_ADF4360_6},
+ {"adf4360-7", ID_ADF4360_7},
+ {"adf4360-8", ID_ADF4360_8},
+ {"adf4360-9", ID_ADF4360_9},
+ {}
+};
+
+static struct spi_driver adf4360_driver = {
+ .driver = {
+ .name = "adf4360",
+ .of_match_table = adf4360_of_match,
+ .owner = THIS_MODULE,
+ },
+ .probe = adf4360_probe,
+ .id_table = adf4360_id,
+};
+module_spi_driver(adf4360_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_AUTHOR("Edward Kigwana <ekigwana@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADF4360 PLL");
--
2.20.1
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