linux-kernel - Re: [PATCH v6 6/8] iio: adc: adi-axi-adc: add oversampling

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Message-ID: <20241123160414.5238fa45@jic23-huawei>
Date: Sat, 23 Nov 2024 16:04:14 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc: <robh@...nel.org>, <conor+dt@...nel.org>, <dlechner@...libre.com>,
 <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH v6 6/8] iio: adc: adi-axi-adc: add oversampling

On Mon, 11 Nov 2024 14:12:01 +0200
Antoniu Miclaus <antoniu.miclaus@...log.com> wrote:

> Add support for enabling/disabling oversampling.
As earlier, this is usually an oversample by N, not just a boolean.
If it is boolean for this device, then I assume there is a fixed
ratio.  Make the interface controlling between 1 and whatever that
ratio is.

Jonathan

> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---
> changes in v6:
>  - add support for oversampling enable/disable.
>  drivers/iio/adc/adi-axi-adc.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
> index 9bf967d5b730..8ec668f59c88 100644
> --- a/drivers/iio/adc/adi-axi-adc.c
> +++ b/drivers/iio/adc/adi-axi-adc.c
> @@ -46,6 +46,7 @@
>  #define    ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK	BIT(1)
>  
>  #define ADI_AXI_ADC_REG_CNTRL_3			0x004c
> +#define   AD485X_CNTRL_3_CUSTOM_CTRL_OS_EN_MSK	BIT(2)
>  #define   AD485X_CNTRL_3_CUSTOM_CTRL_PACKET_FORMAT_MSK	GENMASK(1, 0)
>  #define   AD485X_PACKET_FORMAT_20BIT		0x0
>  #define   AD485X_PACKET_FORMAT_24BIT		0x1
> @@ -341,6 +342,14 @@ static int axi_adc_data_size_set(struct iio_backend *back, unsigned int size)
>  				  AD485X_CNTRL_3_CUSTOM_CTRL_PACKET_FORMAT_MSK, val);
>  }
>  
> +static int axi_adc_oversampling_en(struct iio_backend *back, bool en)
> +{
> +	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
> +
> +	return regmap_update_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
> +				  AD485X_CNTRL_3_CUSTOM_CTRL_OS_EN_MSK, en);
> +}
> +
>  static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
>  						 struct iio_dev *indio_dev)
>  {
> @@ -390,6 +399,7 @@ static const struct iio_backend_ops adi_axi_adc_ops = {
>  	.chan_status = axi_adc_chan_status,
>  	.interface_type_get = axi_adc_interface_type_get,
>  	.data_size_set = axi_adc_data_size_set,
> +	.oversampling_en = axi_adc_oversampling_en,
>  	.debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access),
>  	.debugfs_print_chan_status = iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status),
>  };