Re: [PATCH 3/4] staging: iio: ad9832: use clock framework for clock reference

[Jonathan Cameron]

On Mon, 1 Apr 2019 11:37:45 -0300
Marcelo Schmitt <marcelo.schmitt1@xxxxxxxxx> 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@xxxxxxxxx>
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;