linux-kernel - Re: [PATCH v5 3/6] iio: adc: adi-axi-adc: add interface type

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Message-ID: <bff6d5d6-1cbb-4447-9682-4c20223ee03e@baylibre.com>
Date: Fri, 1 Nov 2024 14:26:21 -0500
From: David Lechner <dlechner@...libre.com>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>, jic23@...nel.org,
 conor+dt@...nel.org, linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH v5 3/6] iio: adc: adi-axi-adc: add interface type

On 11/1/24 6:23 AM, Antoniu Miclaus wrote:
> Add support for getting the interface (CMOS or LVDS) used by the AXI ADC
> IP.
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---

Reviewed-by: David Lechner <dlechner@...libre.com>

> changes in v5:
>  - use IIO_BACKEND_INTERFACE_SERIAL_CMOS and IIO_BACKEND_INTERFACE_SERIAL_LVDS
>  drivers/iio/adc/adi-axi-adc.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
> index 5c8c87eb36d1..f6475bc93796 100644
> --- a/drivers/iio/adc/adi-axi-adc.c
> +++ b/drivers/iio/adc/adi-axi-adc.c
> @@ -39,6 +39,9 @@
>  #define   ADI_AXI_REG_RSTN_MMCM_RSTN		BIT(1)
>  #define   ADI_AXI_REG_RSTN_RSTN			BIT(0)
>  
> +#define ADI_AXI_ADC_REG_CONFIG			0x000c
> +#define   ADI_AXI_ADC_REG_CONFIG_CMOS_OR_LVDS_N	BIT(7)
> +
>  #define ADI_AXI_ADC_REG_CTRL			0x0044
>  #define    ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK	BIT(1)
>  
> @@ -290,6 +293,25 @@ static int axi_adc_chan_disable(struct iio_backend *back, unsigned int chan)
>  				 ADI_AXI_REG_CHAN_CTRL_ENABLE);
>  }
>  
> +static int axi_adc_interface_type_get(struct iio_backend *back,
> +				      enum iio_backend_interface_type *type)
> +{
> +	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
> +	unsigned int val;
> +	int ret;
> +
> +	ret = regmap_read(st->regmap, ADI_AXI_ADC_REG_CONFIG, &val);
> +	if (ret)
> +		return ret;
> +
> +	if (val & ADI_AXI_ADC_REG_CONFIG_CMOS_OR_LVDS_N)

FIELD_GET() also works here.

> +		*type = IIO_BACKEND_INTERFACE_SERIAL_CMOS;
> +	else
> +		*type = IIO_BACKEND_INTERFACE_SERIAL_LVDS;
> +
> +	return 0;
> +}
> +
>  static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
>  						 struct iio_dev *indio_dev)
>  {
> @@ -337,6 +359,7 @@ static const struct iio_backend_ops adi_axi_adc_ops = {
>  	.iodelay_set = axi_adc_iodelays_set,
>  	.test_pattern_set = axi_adc_test_pattern_set,
>  	.chan_status = axi_adc_chan_status,
> +	.interface_type_get = axi_adc_interface_type_get,
>  	.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),
>  };