From: Beniamin Bia <biabenia...@gmail.com>
The clock frequency is loaded from device-tree using clock framework
instead of statically value. The change allow configuration of
the device via device-trees and better initialization sequence.
This is part of broader effort to add device-tree support to this driver
and take it out from staging.
Signed-off-by: Beniamin Bia <beniamin....@analog.com>
---
Changes in v2:
-the intermidiate clk variable was replaced by the variable in
device state
-st variable may be uninitialized warning was fixed by adding a new
error label
drivers/staging/iio/frequency/ad9834.c | 35 ++++++++++++++++++--------
1 file changed, 24 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/iio/frequency/ad9834.c
b/drivers/staging/iio/frequency/ad9834.c
index f4f5eaa15e30..f036f75d1f22 100644
--- a/drivers/staging/iio/frequency/ad9834.c
+++ b/drivers/staging/iio/frequency/ad9834.c
@@ -6,6 +6,7 @@
* Licensed under the GPL-2.
*/
+#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
@@ -71,7 +72,7 @@
struct ad9834_state {
struct spi_device *spi;
struct regulator *reg;
- unsigned int mclk;
+ struct clk *mclk;
unsigned short control;
unsigned short devid;
struct spi_transfer xfer;
@@ -110,12 +111,15 @@ static unsigned int ad9834_calc_freqreg(unsigned long
mclk, unsigned long fout)
static int ad9834_write_frequency(struct ad9834_state *st,
unsigned long addr, unsigned long fout)
{
+ unsigned long clk_freq;
unsigned long regval;
- if (fout > (st->mclk / 2))
+ clk_freq = clk_get_rate(st->mclk);
+
+ if (fout > (clk_freq / 2))
return -EINVAL;
- regval = ad9834_calc_freqreg(st->mclk, fout);
+ regval = ad9834_calc_freqreg(clk_freq, fout);
st->freq_data[0] = cpu_to_be16(addr | (regval &
RES_MASK(AD9834_FREQ_BITS / 2)));
@@ -415,7 +419,14 @@ static int ad9834_probe(struct spi_device *spi)
spi_set_drvdata(spi, indio_dev);
st = iio_priv(indio_dev);
mutex_init(&st->lock);
- st->mclk = 25000000;
+ st->mclk = devm_clk_get(&spi->dev, NULL);
+
+ ret = clk_prepare_enable(st->mclk);
+ if (ret) {
+ dev_err(&spi->dev, "Failed to enable master clock\n");
+ goto error_disable_reg;
+ }
+
st->spi = spi;
st->devid = spi_get_device_id(spi)->driver_data;
st->reg = reg;
@@ -460,31 +471,32 @@ static int ad9834_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_reg;
+ goto error_clock_unprepare;
}
ret = ad9834_write_frequency(st, AD9834_REG_FREQ0, 1000000);
if (ret)
- goto error_disable_reg;
+ goto error_clock_unprepare;
ret = ad9834_write_frequency(st, AD9834_REG_FREQ1, 5000000);
if (ret)
- goto error_disable_reg;
+ goto error_clock_unprepare;
ret = ad9834_write_phase(st, AD9834_REG_PHASE0, 512);
if (ret)
- goto error_disable_reg;
+ goto error_clock_unprepare;
ret = ad9834_write_phase(st, AD9834_REG_PHASE1, 1024);
if (ret)
- goto error_disable_reg;
+ goto error_clock_unprepare;
ret = iio_device_register(indio_dev);
if (ret)
- goto error_disable_reg;
+ goto error_clock_unprepare;
return 0;
-
+error_clock_unprepare:
+ clk_disable_unprepare(st->mclk);
error_disable_reg:
regulator_disable(reg);
@@ -497,6 +509,7 @@ static int ad9834_remove(struct spi_device *spi)
struct ad9834_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
+ clk_disable_unprepare(st->mclk);
regulator_disable(st->reg);
return 0;
--
2.17.1
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