linux-kernel - Re: [PATCH v4 05/10] iio: adc: adi-axi-adc: add filter type config

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Message-ID: <44a14b310695b725cdda35226c2e9bf6525b777e.camel@gmail.com>
Date: Fri, 02 May 2025 16:20:50 +0100
From: Nuno Sá <noname.nuno@...il.com>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>, jic23@...nel.org, 
	robh@...nel.org, conor+dt@...nel.org, linux-iio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 05/10] iio: adc: adi-axi-adc: add filter type config

On Fri, 2025-05-02 at 11:59 +0300, Antoniu Miclaus wrote:
> Add support for enabling/disabling filter based on the filter type
> provided.
> 
> This feature is specific to the axi ad408x IP core, therefore add new
> compatible string and corresponding iio_backend_ops.
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---

Reviewed-by: Nuno Sá <nuno.sa@...log.com>

> changes in v4:
>  - update commit message to state that the new compatible is added.
>  - checking for max value is done in the iio_backend function.
>  drivers/iio/adc/adi-axi-adc.c | 38 +++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
> index 61ab7dce43be..2a3a6c3f5e59 100644
> --- a/drivers/iio/adc/adi-axi-adc.c
> +++ b/drivers/iio/adc/adi-axi-adc.c
> @@ -52,6 +52,7 @@
>  #define   AXI_AD485X_PACKET_FORMAT_20BIT	0x0
>  #define   AXI_AD485X_PACKET_FORMAT_24BIT	0x1
>  #define   AXI_AD485X_PACKET_FORMAT_32BIT	0x2
> +#define   AXI_AD408X_CNTRL_3_FILTER_EN_MSK	BIT(0)
>  
>  #define ADI_AXI_ADC_REG_DRP_STATUS		0x0074
>  #define   ADI_AXI_ADC_DRP_LOCKED		BIT(17)
> @@ -402,6 +403,19 @@ static int axi_adc_ad485x_oversampling_ratio_set(struct
> iio_backend *back,
>  	}
>  }
>  
> +static int axi_adc_ad408x_filter_type_set(struct iio_backend *back,
> +					  enum iio_backend_filter_type type)
> +{
> +	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
> +
> +	if (type)
> +		return regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
> +				       AXI_AD408X_CNTRL_3_FILTER_EN_MSK);
> +
> +	return regmap_clear_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
> +				 AXI_AD408X_CNTRL_3_FILTER_EN_MSK);
> +}
> +
>  static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
>  						 struct iio_dev *indio_dev)
>  {
> @@ -582,6 +596,24 @@ static const struct iio_backend_info axi_ad485x = {
>  	.ops = &adi_ad485x_ops,
>  };
>  
> +static const struct iio_backend_ops adi_ad408x_ops = {
> +	.enable = axi_adc_enable,
> +	.disable = axi_adc_disable,
> +	.chan_enable = axi_adc_chan_enable,
> +	.chan_disable = axi_adc_chan_disable,
> +	.request_buffer = axi_adc_request_buffer,
> +	.free_buffer = axi_adc_free_buffer,
> +	.data_sample_trigger = axi_adc_data_sample_trigger,
> +	.filter_type_set = axi_adc_ad408x_filter_type_set,
> +	.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),
> +};
> +
> +static const struct iio_backend_info axi_ad408x = {
> +	.name = "axi-ad408x",
> +	.ops = &adi_ad408x_ops,
> +};
> +
>  static int adi_axi_adc_probe(struct platform_device *pdev)
>  {
>  	struct adi_axi_adc_state *st;
> @@ -697,9 +729,15 @@ static const struct axi_adc_info adc_ad7606 = {
>  	.has_child_nodes = true,
>  };
>  
> +static const struct axi_adc_info adi_axi_ad408x = {
> +	.version = ADI_AXI_PCORE_VER(10, 0, 'a'),
> +	.backend_info = &axi_ad408x,
> +};
> +
>  /* Match table for of_platform binding */
>  static const struct of_device_id adi_axi_adc_of_match[] = {
>  	{ .compatible = "adi,axi-adc-10.0.a", .data = &adc_generic },
> +	{ .compatible = "adi,axi-ad408x", .data = &adi_axi_ad408x },
>  	{ .compatible = "adi,axi-ad485x", .data = &adi_axi_ad485x },
>  	{ .compatible = "adi,axi-ad7606x", .data = &adc_ad7606 },
>  	{ /* end of list */ }