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Subject[PATCH 3/4] staging: iio: ad9832: use clock framework for clock reference
Previously external clock were set through platform_data struct.
Now device uses clk struct defined in include/linux/clk.h to handle
external clock source.
It also removes mclk from platform_data struct.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
---
drivers/staging/iio/frequency/ad9832.c | 37 +++++++++++++++++---------
drivers/staging/iio/frequency/ad9832.h | 1 -
2 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index d8d4a7936275..74308a2e72db 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -7,6 +7,7 @@

#include <asm/div64.h>

+#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/kernel.h>
@@ -95,7 +96,7 @@ struct ad9832_state {
struct spi_device *spi;
struct regulator *avdd;
struct regulator *dvdd;
- unsigned long mclk;
+ struct clk *mclk;
unsigned short ctrl_fp;
unsigned short ctrl_ss;
unsigned short ctrl_src;
@@ -130,10 +131,10 @@ static int ad9832_write_frequency(struct ad9832_state *st,
{
unsigned long regval;

- if (fout > (st->mclk / 2))
+ if (fout > (clk_get_rate(st->mclk) / 2))
return -EINVAL;

- regval = ad9832_calc_freqreg(st->mclk, fout);
+ regval = ad9832_calc_freqreg(clk_get_rate(st->mclk), fout);

st->freq_data[0] = cpu_to_be16((AD9832_CMD_FRE8BITSW << CMD_SHIFT) |
(addr << ADD_SHIFT) |
@@ -334,7 +335,16 @@ static int ad9832_probe(struct spi_device *spi)
goto error_disable_avdd;
}

- st->mclk = pdata->mclk;
+ st->mclk = devm_clk_get(&spi->dev, "mclk");
+ if (IS_ERR(st->mclk)) {
+ ret = PTR_ERR(st->mclk);
+ goto error_disable_dvdd;
+ }
+
+ ret = clk_prepare_enable(st->mclk);
+ if (ret < 0)
+ goto error_disable_dvdd;
+
st->spi = spi;
mutex_init(&st->lock);

@@ -385,39 +395,41 @@ static int ad9832_probe(struct spi_device *spi)
ret = spi_sync(st->spi, &st->msg);
if (ret) {
dev_err(&spi->dev, "device init failed\n");
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;
}

ret = ad9832_write_frequency(st, AD9832_FREQ0HM, pdata->freq0);
if (ret)
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;

ret = ad9832_write_frequency(st, AD9832_FREQ1HM, pdata->freq1);
if (ret)
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;

ret = ad9832_write_phase(st, AD9832_PHASE0H, pdata->phase0);
if (ret)
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;

ret = ad9832_write_phase(st, AD9832_PHASE1H, pdata->phase1);
if (ret)
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;

ret = ad9832_write_phase(st, AD9832_PHASE2H, pdata->phase2);
if (ret)
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;

ret = ad9832_write_phase(st, AD9832_PHASE3H, pdata->phase3);
if (ret)
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;

ret = iio_device_register(indio_dev);
if (ret)
- goto error_disable_dvdd;
+ goto error_unprepare_mclk;

return 0;

+error_unprepare_mclk:
+ clk_disable_unprepare(st->mclk);
error_disable_dvdd:
regulator_disable(st->dvdd);
error_disable_avdd:
@@ -432,6 +444,7 @@ static int ad9832_remove(struct spi_device *spi)
struct ad9832_state *st = iio_priv(indio_dev);

iio_device_unregister(indio_dev);
+ clk_disable_unprepare(st->mclk);
regulator_disable(st->dvdd);
regulator_disable(st->avdd);

diff --git a/drivers/staging/iio/frequency/ad9832.h b/drivers/staging/iio/frequency/ad9832.h
index 39d326cc1af9..032579a2d539 100644
--- a/drivers/staging/iio/frequency/ad9832.h
+++ b/drivers/staging/iio/frequency/ad9832.h
@@ -24,7 +24,6 @@
*/

struct ad9832_platform_data {
- unsigned long mclk;
unsigned long freq0;
unsigned long freq1;
unsigned short phase0;
--
2.20.1
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