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iio: frequency: adf4350: Add support for clock consumer framework 

Preferably get clkin (PLL reference clock) from clock framework

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Michael Hennerich 2013-06-03 14:30:00 +01:00 committed by Jonathan Cameron
parent 5f43264c53
commit 9404fa15f2
1 changed files with 49 additions and 9 deletions
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58
drivers/iio/frequency/adf4350.c
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@ -1,7 +1,7 @@
/*
* ADF4350/ADF4351 SPI Wideband Synthesizer driver
*
* Copyright 2012 Analog Devices Inc.
* Copyright 2012-2013 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
@ -17,6 +17,7 @@
#include <linux/gcd.h>
#include <linux/gpio.h>
#include <asm/div64.h>
#include <linux/clk.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@ -33,6 +34,7 @@ struct adf4350_state {
struct spi_device *spi;
struct regulator *reg;
struct adf4350_platform_data *pdata;
struct clk *clk;
unsigned long clkin;
unsigned long chspc; /* Channel Spacing */
unsigned long fpfd; /* Phase Frequency Detector */
@ -43,7 +45,7 @@ struct adf4350_state {
unsigned r4_rf_div_sel;
unsigned long regs[6];
unsigned long regs_hw[6];
unsigned long long freq_req;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@ -52,7 +54,6 @@ struct adf4350_state {
};
static struct adf4350_platform_data default_pdata = {
.clkin = 122880000,
.channel_spacing = 10000,
.r2_user_settings = ADF4350_REG2_PD_POLARITY_POS |
ADF4350_REG2_CHARGE_PUMP_CURR_uA(2500),
@ -235,6 +236,7 @@ static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq)
ADF4350_REG4_MUTE_TILL_LOCK_EN));
st->regs[ADF4350_REG5] = ADF4350_REG5_LD_PIN_MODE_DIGITAL;
st->freq_req = freq;
return adf4350_sync_config(st);
}
@ -246,6 +248,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
{
struct adf4350_state *st = iio_priv(indio_dev);
unsigned long long readin;
unsigned long tmp;
int ret;
ret = kstrtoull(buf, 10, &readin);
@ -258,10 +261,23 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
ret = adf4350_set_freq(st, readin);
break;
case ADF4350_FREQ_REFIN:
if (readin > ADF4350_MAX_FREQ_REFIN)
if (readin > ADF4350_MAX_FREQ_REFIN) {
ret = -EINVAL;
else
st->clkin = readin;
break;
}
if (st->clk) {
tmp = clk_round_rate(st->clk, readin);
if (tmp != readin) {
ret = -EINVAL;
break;
}
ret = clk_set_rate(st->clk, tmp);
if (ret < 0)
break;
}
st->clkin = readin;
ret = adf4350_set_freq(st, st->freq_req);
break;
case ADF4350_FREQ_RESOLUTION:
if (readin == 0)
@ -308,6 +324,9 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
}
break;
case ADF4350_FREQ_REFIN:
if (st->clk)
st->clkin = clk_get_rate(st->clk);
val = st->clkin;
break;
case ADF4350_FREQ_RESOLUTION:
@ -318,6 +337,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
break;
default:
ret = -EINVAL;
val = 0;
}
mutex_unlock(&indio_dev->mlock);
@ -360,14 +380,24 @@ static int adf4350_probe(struct spi_device *spi)
struct adf4350_platform_data *pdata = spi->dev.platform_data;
struct iio_dev *indio_dev;
struct adf4350_state *st;
struct clk *clk = NULL;
int ret;
if (!pdata) {
dev_warn(&spi->dev, "no platform data? using default\n");
pdata = &default_pdata;
}
if (!pdata->clkin) {
clk = clk_get(&spi->dev, "clkin");
if (IS_ERR(clk))
return -EPROBE_DEFER;
ret = clk_prepare_enable(clk);
if (ret < 0)
return ret;
}
indio_dev = iio_device_alloc(sizeof(*st));
if (indio_dev == NULL)
return -ENOMEM;
@ -395,7 +425,12 @@ static int adf4350_probe(struct spi_device *spi)
indio_dev->num_channels = 1;
st->chspc = pdata->channel_spacing;
st->clkin = pdata->clkin;
if (clk) {
st->clk = clk;
st->clkin = clk_get_rate(clk);
} else {
st->clkin = pdata->clkin;
}
st->min_out_freq = spi_get_device_id(spi)->driver_data == 4351 ?
ADF4351_MIN_OUT_FREQ : ADF4350_MIN_OUT_FREQ;
@ -435,6 +470,8 @@ error_put_reg:
if (!IS_ERR(st->reg))
regulator_put(st->reg);
if (clk)
clk_disable_unprepare(clk);
iio_device_free(indio_dev);
return ret;
@ -451,6 +488,9 @@ static int adf4350_remove(struct spi_device *spi)
iio_device_unregister(indio_dev);
if (st->clk)
clk_disable_unprepare(st->clk);
if (!IS_ERR(reg)) {
regulator_disable(reg);
regulator_put(reg);
@ -481,6 +521,6 @@ static struct spi_driver adf4350_driver = {
};
module_spi_driver(adf4350_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("Analog Devices ADF4350/ADF4351 PLL");
MODULE_LICENSE("GPL v2");