[PATCH 0/2] iio: adc: ad9467: add support for ad9211

[PATCH 0/2] iio: adc: ad9467: add support for ad9211

[Tomas Melin]

This series adds support for the ad9211, a variant of the already
supported devices.

Example usage:

$ cat name 
ad9211
$ cat in_voltage_scale_available 
0.957031 0.976562 0.996093 1.015625 1.035156 1.054687 1.074218
1.093750 1.113281 1.132812 1.152343 1.162109 1.171875 1.181640
1.191406 1.201171 1.220703 1.240234 1.259765 1.279296 1.298828
1.318359 1.337890 1.357421 1.376953 1.396484 1.416015 1.425781
1.435546 1.445312 1.455078 1.464843

Link: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
---
Tomas Melin (2):
      dt-bindings: adc: ad9467: add support for ad9211
      iio: adc: ad9467: add support for ad9211

 .../devicetree/bindings/iio/adc/adi,ad9467.yaml    |  2 ++
 drivers/iio/adc/ad9467.c                           | 42 ++++++++++++++++++++++
 2 files changed, 44 insertions(+)
---
base-commit: ac3fd01e4c1efce8f2c054cdeb2ddd2fc0fb150d
change-id: 20251203-add-ad9211-897dc9354185

Best regards,
-- 
Tomas Melin <tomas.melin@vaisala.com>

[PATCH 1/2] dt-bindings: adc: ad9467: add support for ad9211

[Tomas Melin]

Document ad9211 variant as supported by driver.

Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
---
 Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml
index 2606c0c5dfc61fd65cd0fb2015b3f659c2fc9e07..5acfb0eef4d5cf487adaa93ce5bda759bb4853c9 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml
@@ -18,6 +18,7 @@ description: |
   All the parts support the register map described by Application Note AN-877
    https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf
 
+  https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/AD9265.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/AD9434.pdf
   https://www.analog.com/media/en/technical-documentation/data-sheets/AD9467.pdf
@@ -25,6 +26,7 @@ description: |
 properties:
   compatible:
     enum:
+      - adi,ad9211
       - adi,ad9265
       - adi,ad9434
       - adi,ad9467

-- 
2.47.3

[PATCH 2/2] iio: adc: ad9467: add support for ad9211

[Tomas Melin]

The AD9211 is a 10-bit monolithic sampling analog-to-digital
converter optimized for high performance, low power, and ease
of use. The product operates at up to a 300 MSPS conversion
rate and is optimized for outstanding dynamic performance
in wideband carrier and broadband systems.

The scale table implemented here is not an exact match with the
datasheet as the table presented there is missing some information.
The reference presents these values as being linear,
but that does not add up. There is information missing in the table.
Implemented scale table matches values at the middle and at the ends,
smoothing the curve towards middle and end.
Impact on end result from deviation in scale factor affects only software
using it for scaling. All the possible hw-settings are also available with
this implementation.

Link: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
---
 drivers/iio/adc/ad9467.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c
index f7a9f46ea0dc405e25f312197df4b2131871b4bc..13c8eff5bc103ba6161dcd92b928c5fd96b57b97 100644
--- a/drivers/iio/adc/ad9467.c
+++ b/drivers/iio/adc/ad9467.c
@@ -81,6 +81,14 @@
 /* AN877_ADC_REG_OUTPUT_DELAY */
 #define AN877_ADC_DCO_DELAY_ENABLE		0x80
 
+/*
+ * Analog Devices AD9211 10-Bit, 200/250/300 MSPS ADC
+ */
+
+#define CHIPID_AD9211			0x06
+#define AD9211_DEF_OUTPUT_MODE		0x00
+#define AD9211_REG_VREF_MASK		GENMASK(4, 0)
+
 /*
  * Analog Devices AD9265 16-Bit, 125/105/80 MSPS ADC
  */
@@ -234,6 +242,17 @@ static int ad9467_reg_access(struct iio_dev *indio_dev, unsigned int reg,
 	return 0;
 }
 
+static const unsigned int ad9211_scale_table[][2] = {
+	{980, 0x10}, {1000, 0x11}, {1020, 0x12}, {1040, 0x13},
+	{1060, 0x14}, {1080, 0x15}, {1100, 0x16}, {1120, 0x17},
+	{1140, 0x18}, {1160, 0x19}, {1180, 0x1A}, {1190, 0x1B},
+	{1200, 0x1C}, {1210, 0x1D}, {1220, 0x1E}, {1230, 0x1F},
+	{1250, 0x0}, {1270, 0x1}, {1290, 0x2}, {1310, 0x3},
+	{1330, 0x4}, {1350, 0x5}, {1370, 0x6}, {1390, 0x7},
+	{1410, 0x8}, {1430, 0x9}, {1450, 0xA}, {1460, 0xB},
+	{1470, 0xC}, {1480, 0xD}, {1490, 0xE}, {1500, 0xF},
+};
+
 static const unsigned int ad9265_scale_table[][2] = {
 	{1250, 0x00}, {1500, 0x40}, {1750, 0x80}, {2000, 0xC0},
 };
@@ -297,6 +316,10 @@ static void __ad9467_get_scale(struct ad9467_state *st, int index,
 	},								\
 }
 
+static const struct iio_chan_spec ad9211_channels[] = {
+	AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 10, 's'),
+};
+
 static const struct iio_chan_spec ad9434_channels[] = {
 	AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 12, 's'),
 };
@@ -369,6 +392,23 @@ static const struct ad9467_chip_info ad9434_chip_tbl = {
 	.num_lanes = 6,
 };
 
+static const struct ad9467_chip_info ad9211_chip_tbl = {
+	.name = "ad9211",
+	.id = CHIPID_AD9211,
+	.max_rate = 300000000UL,
+	.scale_table = ad9211_scale_table,
+	.num_scales = ARRAY_SIZE(ad9211_scale_table),
+	.channels = ad9211_channels,
+	.num_channels = ARRAY_SIZE(ad9211_channels),
+	.test_points = AD9647_MAX_TEST_POINTS,
+	.test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
+			     AN877_ADC_TESTMODE_OFF),
+	.test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
+	.default_output_mode = AD9211_DEF_OUTPUT_MODE,
+	.vref_mask = AD9211_REG_VREF_MASK,
+	.has_dco = true,
+};
+
 static const struct ad9467_chip_info ad9265_chip_tbl = {
 	.name = "ad9265",
 	.id = CHIPID_AD9265,
@@ -1264,6 +1304,7 @@ static int ad9467_probe(struct spi_device *spi)
 }
 
 static const struct of_device_id ad9467_of_match[] = {
+	{ .compatible = "adi,ad9211", .data = &ad9211_chip_tbl, },
 	{ .compatible = "adi,ad9265", .data = &ad9265_chip_tbl, },
 	{ .compatible = "adi,ad9434", .data = &ad9434_chip_tbl, },
 	{ .compatible = "adi,ad9467", .data = &ad9467_chip_tbl, },
@@ -1275,6 +1316,7 @@ static const struct of_device_id ad9467_of_match[] = {
 MODULE_DEVICE_TABLE(of, ad9467_of_match);
 
 static const struct spi_device_id ad9467_ids[] = {
+	{ "ad9211", (kernel_ulong_t)&ad9211_chip_tbl },
 	{ "ad9265", (kernel_ulong_t)&ad9265_chip_tbl },
 	{ "ad9434", (kernel_ulong_t)&ad9434_chip_tbl },
 	{ "ad9467", (kernel_ulong_t)&ad9467_chip_tbl },

-- 
2.47.3

Re: [PATCH 2/2] iio: adc: ad9467: add support for ad9211

[Andy Shevchenko]

On Wed, Dec 03, 2025 at 12:20:34PM +0000, Tomas Melin wrote:
> The AD9211 is a 10-bit monolithic sampling analog-to-digital
> converter optimized for high performance, low power, and ease
> of use. The product operates at up to a 300 MSPS conversion
> rate and is optimized for outstanding dynamic performance
> in wideband carrier and broadband systems.
> 
> The scale table implemented here is not an exact match with the
> datasheet as the table presented there is missing some information.
> The reference presents these values as being linear,
> but that does not add up. There is information missing in the table.
> Implemented scale table matches values at the middle and at the ends,
> smoothing the curve towards middle and end.
> Impact on end result from deviation in scale factor affects only software
> using it for scaling. All the possible hw-settings are also available with
> this implementation.

> Link: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf

> Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>

...

> +static const struct ad9467_chip_info ad9211_chip_tbl = {
> +	.name = "ad9211",
> +	.id = CHIPID_AD9211,
> +	.max_rate = 300000000UL,

It's too many 0:s. Less error prone is to write it as

	300 * HZ_PER_MHZ

> +	.scale_table = ad9211_scale_table,
> +	.num_scales = ARRAY_SIZE(ad9211_scale_table),
> +	.channels = ad9211_channels,
> +	.num_channels = ARRAY_SIZE(ad9211_channels),
> +	.test_points = AD9647_MAX_TEST_POINTS,
> +	.test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
> +			     AN877_ADC_TESTMODE_OFF),
> +	.test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
> +	.default_output_mode = AD9211_DEF_OUTPUT_MODE,
> +	.vref_mask = AD9211_REG_VREF_MASK,
> +	.has_dco = true,
> +};

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 1/2] dt-bindings: adc: ad9467: add support for ad9211

[Nuno Sá]

On Wed, 2025-12-03 at 12:20 +0000, Tomas Melin wrote:
> Document ad9211 variant as supported by driver.
> 
> Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
> ---

You should mention why this can't have a fallback compatible. Like having a different scaling factor
is enough justification for it.

- Nuno Sá

>  Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml
> b/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml
> index 2606c0c5dfc61fd65cd0fb2015b3f659c2fc9e07..5acfb0eef4d5cf487adaa93ce5bda759bb4853c9 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad9467.yaml
> @@ -18,6 +18,7 @@ description: |
>    All the parts support the register map described by Application Note AN-877
>     https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf
>  
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
>    https://www.analog.com/media/en/technical-documentation/data-sheets/AD9265.pdf
>    https://www.analog.com/media/en/technical-documentation/data-sheets/AD9434.pdf
>    https://www.analog.com/media/en/technical-documentation/data-sheets/AD9467.pdf
> @@ -25,6 +26,7 @@ description: |
>  properties:
>    compatible:
>      enum:
> +      - adi,ad9211
>        - adi,ad9265
>        - adi,ad9434
>        - adi,ad9467

Re: [PATCH 2/2] iio: adc: ad9467: add support for ad9211

[Tomas Melin]

Hi,

On 03/12/2025 14:48, Andy Shevchenko wrote:
> On Wed, Dec 03, 2025 at 12:20:34PM +0000, Tomas Melin wrote:
>> The AD9211 is a 10-bit monolithic sampling analog-to-digital
>> converter optimized for high performance, low power, and ease
>> of use. The product operates at up to a 300 MSPS conversion
>> rate and is optimized for outstanding dynamic performance
>> in wideband carrier and broadband systems.
>>
>> The scale table implemented here is not an exact match with the
>> datasheet as the table presented there is missing some information.
>> The reference presents these values as being linear,
>> but that does not add up. There is information missing in the table.
>> Implemented scale table matches values at the middle and at the ends,
>> smoothing the curve towards middle and end.
>> Impact on end result from deviation in scale factor affects only software
>> using it for scaling. All the possible hw-settings are also available with
>> this implementation.
> 
>> Link: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
> 
> Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
> 

That will give

WARNING: Unknown link reference 'Datasheet:', use 'Link:' or
'Closes:' instead
#22:
Datasheet:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf

So I would like to keep it as is. Or then please convince checkpatch it
should be accepted as a valid tag ;)



>> Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
> 
> ...
> 
>> +static const struct ad9467_chip_info ad9211_chip_tbl = {
>> +	.name = "ad9211",
>> +	.id = CHIPID_AD9211,
>> +	.max_rate = 300000000UL,
> 
> It's too many 0:s. Less error prone is to write it as
> 
> 	300 * HZ_PER_MHZ
There is no typo here, but I agree with that suggestion, thanks will update.

BR,
Tomas


> 
>> +	.scale_table = ad9211_scale_table,
>> +	.num_scales = ARRAY_SIZE(ad9211_scale_table),
>> +	.channels = ad9211_channels,
>> +	.num_channels = ARRAY_SIZE(ad9211_channels),
>> +	.test_points = AD9647_MAX_TEST_POINTS,
>> +	.test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
>> +			     AN877_ADC_TESTMODE_OFF),
>> +	.test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
>> +	.default_output_mode = AD9211_DEF_OUTPUT_MODE,
>> +	.vref_mask = AD9211_REG_VREF_MASK,
>> +	.has_dco = true,
>> +};
> 

Re: [PATCH 2/2] iio: adc: ad9467: add support for ad9211

[Andy Shevchenko]

On Wed, Dec 03, 2025 at 03:33:15PM +0200, Tomas Melin wrote:
> On 03/12/2025 14:48, Andy Shevchenko wrote:
> > On Wed, Dec 03, 2025 at 12:20:34PM +0000, Tomas Melin wrote:

...

> >> Link: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
> > 
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
> 
> That will give
> 
> WARNING: Unknown link reference 'Datasheet:', use 'Link:' or
> 'Closes:' instead
> #22:
> Datasheet:
> https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
> 
> So I would like to keep it as is. Or then please convince checkpatch it
> should be accepted as a valid tag ;)

checkpatch is full of false-positives. It's a recommendation tool, don't stick
to it too much.

	git log --oneline --no-merges --grep ^Datasheet:

will give you list of examples existing in the Git history, 163 and counting.

The first one appeared in 2009 and started being used widely ca. 2015.

-- 
With Best Regards,
Andy Shevchenko