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SubjectRe: [PATCH 3/4] staging: iio: ad9832: use clock framework for clock reference
On Mon, 1 Apr 2019 11:37:45 -0300
Marcelo Schmitt <marcelo.schmitt1@gmail.com> wrote:

> 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>
Looks good to me.

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
> 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;

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