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