[PATCH v3 0/3] ad777x driver addressing patch comments

[PATCH v3 0/3] ad777x driver addressing patch comments

[Ramona Alexandra Nechita]

This patch series is sent to address the comments received
with regards to the ad7779 driver patch:
v2-0001-drivers-iio-adc-add-support-for-ad777x-family.patch,
as well as the dt-bindings patch:
v3-0001-dt-bindings-iio-adc-add-a7779-doc.patch.
The patches were initially sent separated, this has now
been corrected with this patch series, along with soeme
other issues such as the cover letter and author.
The changes in the series:
v3:
	* drop spi-max-frequency from yaml and fix indent
	* separate ABI doc into different patch, drop ad4130
	 ABI doc file and combine the filter_mode/type properties
	 in the sysfs-bus-iio file
	* update Kconfig help section for the driver
	* update driver commit message
	* drop crc_enabled and check crc by default on all regs
	  except GEN_ERR_REG_1_EN
	* rename from "ad777x_*" to "ad7779_*"
	* switch from kfifo to triggered buffer and send w/timestamp
	* switched spidata_rx/tx buffer data type to u8 and declared
	  channels as IIO_BE
	* switched to fsleep and added comments for each of them
	* changed "____cacheline_aligned" to "__aligned(IIO_DMA_MINALIGN)"
	* fixed allignments and removed redundant variables
	* removed local update_scan_mode in favor of iio active_scan_mask
	* requested trigger as NO_AUTOEN and it is enabled/disabled only
	  in preenable/postdisable functions
	* removed separate ad777x_register function and moved the code
	  in probe
	* switched to get_clk_enabled
	* check for irq earlier in probe
	* misc code style / format changes, as suggested

Ramona Alexandra Nechita (3):
  dt-bindings: iio: adc: add a7779 doc
  Documentation: ABI: added filter mode doc in sysfs-bus-iio
  drivers: iio: adc: add support for ad777x family

 Documentation/ABI/testing/sysfs-bus-iio       |   7 +
 .../ABI/testing/sysfs-bus-iio-adc-ad4130      |  46 -
 .../bindings/iio/adc/adi,ad7779.yaml          |  84 ++
 drivers/iio/adc/Kconfig                       |  11 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/ad7779.c                      | 936 ++++++++++++++++++
 6 files changed, 1039 insertions(+), 46 deletions(-)
 delete mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
 create mode 100644 drivers/iio/adc/ad7779.c

-- 
2.43.0

[PATCH v3 1/3] dt-bindings: iio: adc: add a7779 doc

[Ramona Alexandra Nechita]

Add dt bindings for adc ad7779.

Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@analog.com>
---
 .../bindings/iio/adc/adi,ad7779.yaml          | 84 +++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
new file mode 100644
index 000000000000..f1eec656acec
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7779.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD777X family 8-Channel, 24-Bit, Simultaneous Sampling ADCs
+
+maintainers:
+  - Ramona Nechita <ramona.nechita@analog.com>
+
+description: |
+  The AD777X family consist of 8-channel, simultaneous sampling analog-to-
+  digital converter (ADC). Eight full Σ-Δ ADCs are on-chip. The
+  AD7771 provides an ultralow input current to allow direct sensor
+  connection. Each input channel has a programmable gain stage
+  allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor
+  outputs into the full-scale ADC input range, maximizing the
+  dynamic range of the signal chain.
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7770.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7771.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7779.pdf
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7770
+      - adi,ad7771
+      - adi,ad7779
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vref-supply:
+    description:
+      ADC reference voltage supply
+
+  start-gpios:
+    description:
+      Pin that controls start synchronization pulse.
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+- |
+  #include <dt-bindings/gpio/gpio.h>
+  spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      adc@0 {
+        compatible = "adi,ad7779";
+        reg = <0>;
+        vref-supply = <&vref>;
+        start-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
+        reset-gpios = <&gpio0 93 GPIO_ACTIVE_LOW>;
+        clocks = <&adc_clk>;
+      };
+  };
+...
-- 
2.43.0

Re: [PATCH v3 1/3] dt-bindings: iio: adc: add a7779 doc

[Rob Herring (Arm)]

On Wed, 19 Jun 2024 15:20:44 +0300, Ramona Alexandra Nechita wrote:
> Add dt bindings for adc ad7779.
> 
> Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@analog.com>
> ---
>  .../bindings/iio/adc/adi,ad7779.yaml          | 84 +++++++++++++++++++
>  1 file changed, 84 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:
./Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml:69:1: [warning] wrong indentation: expected 2 but found 0 (indentation)

dtschema/dtc warnings/errors:

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20240619122105.22642-2-ramona.nechita@analog.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

Re: [PATCH v3 1/3] dt-bindings: iio: adc: add a7779 doc

[Conor Dooley]

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On Wed, Jun 19, 2024 at 03:20:44PM +0300, Ramona Alexandra Nechita wrote:
> Add dt bindings for adc ad7779.
> 
> Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@analog.com>
> ---
>  .../bindings/iio/adc/adi,ad7779.yaml          | 84 +++++++++++++++++++
>  1 file changed, 84 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
> new file mode 100644
> index 000000000000..f1eec656acec
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
> @@ -0,0 +1,84 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad7779.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD777X family 8-Channel, 24-Bit, Simultaneous Sampling ADCs
> +
> +maintainers:
> +  - Ramona Nechita <ramona.nechita@analog.com>
> +
> +description: |
> +  The AD777X family consist of 8-channel, simultaneous sampling analog-to-
> +  digital converter (ADC). Eight full Σ-Δ ADCs are on-chip. The
> +  AD7771 provides an ultralow input current to allow direct sensor
> +  connection. Each input channel has a programmable gain stage
> +  allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor
> +  outputs into the full-scale ADC input range, maximizing the
> +  dynamic range of the signal chain.
> +
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7770.pdf
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7771.pdf
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7779.pdf
> +
> +$ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad7770
> +      - adi,ad7771
> +      - adi,ad7779
> +
> +  reg:
> +    maxItems: 1
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0

Why does this device have address/size cells, but not have any child
nodes? Are you missing some channel child nodes? If you don't have
children, you don't need these properties.

Also, your patch is still not threaded with the other 2 patches in the
series (I see 1/3 in the subject). Where are those patches?

Thanks,
Conor.

> +
> +  clocks:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  vref-supply:
> +    description:
> +      ADC reference voltage supply
> +
> +  start-gpios:
> +    description:
> +      Pin that controls start synchronization pulse.
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +
> +unevaluatedProperties: false
> +
> +examples:
> +- |
> +  #include <dt-bindings/gpio/gpio.h>
> +  spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      adc@0 {
> +        compatible = "adi,ad7779";
> +        reg = <0>;
> +        vref-supply = <&vref>;
> +        start-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
> +        reset-gpios = <&gpio0 93 GPIO_ACTIVE_LOW>;
> +        clocks = <&adc_clk>;
> +      };
> +  };
> +...
> -- 
> 2.43.0
> 

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Re: [PATCH v3 1/3] dt-bindings: iio: adc: add a7779 doc

[Jonathan Cameron]

On Wed, 19 Jun 2024 18:42:31 +0100
Conor Dooley <conor@kernel.org> wrote:

> On Wed, Jun 19, 2024 at 03:20:44PM +0300, Ramona Alexandra Nechita wrote:
> > Add dt bindings for adc ad7779.
> > 
> > Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@analog.com>
> > ---
> >  .../bindings/iio/adc/adi,ad7779.yaml          | 84 +++++++++++++++++++
> >  1 file changed, 84 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
> > new file mode 100644
> > index 000000000000..f1eec656acec
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
> > @@ -0,0 +1,84 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/adc/adi,ad7779.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Analog Devices AD777X family 8-Channel, 24-Bit, Simultaneous Sampling ADCs
> > +
> > +maintainers:
> > +  - Ramona Nechita <ramona.nechita@analog.com>
> > +
> > +description: |
> > +  The AD777X family consist of 8-channel, simultaneous sampling analog-to-
> > +  digital converter (ADC). Eight full Σ-Δ ADCs are on-chip. The
> > +  AD7771 provides an ultralow input current to allow direct sensor
> > +  connection. Each input channel has a programmable gain stage
> > +  allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor
> > +  outputs into the full-scale ADC input range, maximizing the
> > +  dynamic range of the signal chain.
> > +
> > +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7770.pdf
> > +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7771.pdf
> > +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7779.pdf
> > +
> > +$ref: /schemas/spi/spi-peripheral-props.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - adi,ad7770
> > +      - adi,ad7771
> > +      - adi,ad7779
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  '#address-cells':
> > +    const: 1
> > +
> > +  '#size-cells':
> > +    const: 0  
> 
> Why does this device have address/size cells, but not have any child
> nodes? Are you missing some channel child nodes? If you don't have
> children, you don't need these properties.
> 
> Also, your patch is still not threaded with the other 2 patches in the
> series (I see 1/3 in the subject). Where are those patches?

Yeah, I have 3 copies of the cover letter, one with patch 1, one with patch 2,
one on it's own and a stray patch 3 and patchwork has failed to figure
it out...  Can one of the other Analog devices folk help Ramona get a
working confirmation for sending patches please.

The b4 gateway is a good option if no one has the magic config incantation
to get emails out of a particular corporate network.

> 
> Thanks,
> Conor.
> 
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  vref-supply:
> > +    description:
> > +      ADC reference voltage supply

I assume there is at least one more supply?  They should all
be listed in here and those that 'must' be turned on for the
device to function should be in required.  If it's optional, then
add to the description what happens if it isn't supplied. Typically that's
for reference supplies where the device has another option such as an internal
reference.

Jonathan

> > +
> > +  start-gpios:
> > +    description:
> > +      Pin that controls start synchronization pulse.
> > +    maxItems: 1
> > +
> > +  reset-gpios:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +- |
> > +  #include <dt-bindings/gpio/gpio.h>
> > +  spi {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      adc@0 {
> > +        compatible = "adi,ad7779";
> > +        reg = <0>;
> > +        vref-supply = <&vref>;
> > +        start-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
> > +        reset-gpios = <&gpio0 93 GPIO_ACTIVE_LOW>;
> > +        clocks = <&adc_clk>;
> > +      };
> > +  };
> > +...
> > -- 
> > 2.43.0
> >   

Re: [PATCH v3 0/3] ad777x driver addressing patch comments

[Jonathan Cameron]

Don't change the patch title of a series mid way through multiple revisions
without a very good reason. Some of the automation we use relies on those
matching to ensure the latest version is picked up.

J