iio:adc:ltc2371: add support for ltc2361/ltc2363

iio:adc:ltc2371: add support for ltc2361/ltc2363

[Darius Berghe]

Changelog v2->v3:
No changes, adding dt maillist to CC.

Changelog v1->v2:
- document power supply in yaml
- reorder enums in alphabetical order
- add missing include
- drop the of_match_ptr protection

Darius Berghe (3):
  ltc2471: add of_match_table for existing devices
  ltc2471: ltc2461/ltc2463 compatible strings
  ltc2471 driver yaml

 .../bindings/iio/adc/adi,ltc2471.yaml         | 49 +++++++++++++++++++
 drivers/iio/adc/ltc2471.c                     | 25 ++++++++--
 2 files changed, 70 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml

-- 
2.27.0

[PATCH v3 1/3] ltc2471: add of_match_table for existing devices

[Darius Berghe]

OF style match table was missing, this commit adds it.

Signed-off-by: Darius Berghe <darius.berghe@analog.com>
---
 drivers/iio/adc/ltc2471.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iio/adc/ltc2471.c b/drivers/iio/adc/ltc2471.c
index b88102b751cf..e1c4e966524d 100644
--- a/drivers/iio/adc/ltc2471.c
+++ b/drivers/iio/adc/ltc2471.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
+#include <linux/mod_devicetable.h>
 
 enum ltc2471_chips {
 	ltc2471,
@@ -144,9 +145,17 @@ static const struct i2c_device_id ltc2471_i2c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, ltc2471_i2c_id);
 
+static const struct of_device_id ltc2471_of_match[] = {
+	{ .compatible = "adi,ltc2471" },
+	{ .compatible = "adi,ltc2473" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ltc2471_of_match);
+
 static struct i2c_driver ltc2471_i2c_driver = {
 	.driver = {
 		.name = "ltc2471",
+		.of_match_table = ltc2471_of_match
 	},
 	.probe    = ltc2471_i2c_probe,
 	.id_table = ltc2471_i2c_id,
-- 
2.27.0

[PATCH v3 2/3] ltc2471: ltc2461/ltc2463 compatible strings

[Darius Berghe]

Add compatible strings for these devices in the existing ltc2471
driver.

Signed-off-by: Darius Berghe <darius.berghe@analog.com>
---
 drivers/iio/adc/ltc2471.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ltc2471.c b/drivers/iio/adc/ltc2471.c
index e1c4e966524d..8c57203b1fe4 100644
--- a/drivers/iio/adc/ltc2471.c
+++ b/drivers/iio/adc/ltc2471.c
@@ -1,5 +1,7 @@
 /*
- * Driver for Linear Technology LTC2471 and LTC2473 voltage monitors
+ * Driver for Linear Technology LTC2461, LTC2463, LTC2471 and LTC2473 voltage
+ * monitors.
+ * The LTC2463 is identical to the 2461, but reports a differential signal.
  * The LTC2473 is identical to the 2471, but reports a differential signal.
  *
  * Copyright (C) 2017 Topic Embedded Products
@@ -17,8 +19,10 @@
 #include <linux/mod_devicetable.h>
 
 enum ltc2471_chips {
+	ltc2461,
+	ltc2463,
 	ltc2471,
-	ltc2473,
+	ltc2473
 };
 
 struct ltc2471_data {
@@ -122,7 +126,7 @@ static int ltc2471_i2c_probe(struct i2c_client *client,
 	indio_dev->name = id->name;
 	indio_dev->info = &ltc2471_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
-	if (id->driver_data == ltc2473)
+	if (id->driver_data == ltc2473 || id->driver_data == ltc2463)
 		indio_dev->channels = ltc2473_channel;
 	else
 		indio_dev->channels = ltc2471_channel;
@@ -139,6 +143,8 @@ static int ltc2471_i2c_probe(struct i2c_client *client,
 }
 
 static const struct i2c_device_id ltc2471_i2c_id[] = {
+	{ "ltc2461", ltc2461 },
+	{ "ltc2463", ltc2463 },
 	{ "ltc2471", ltc2471 },
 	{ "ltc2473", ltc2473 },
 	{}
@@ -146,6 +152,8 @@ static const struct i2c_device_id ltc2471_i2c_id[] = {
 MODULE_DEVICE_TABLE(i2c, ltc2471_i2c_id);
 
 static const struct of_device_id ltc2471_of_match[] = {
+	{ .compatible = "adi,ltc2461" },
+	{ .compatible = "adi,ltc2463" },
 	{ .compatible = "adi,ltc2471" },
 	{ .compatible = "adi,ltc2473" },
 	{}
@@ -163,6 +171,6 @@ static struct i2c_driver ltc2471_i2c_driver = {
 
 module_i2c_driver(ltc2471_i2c_driver);
 
-MODULE_DESCRIPTION("LTC2471/LTC2473 ADC driver");
+MODULE_DESCRIPTION("LTC2461/LTC2463/LTC2471/LTC2473 ADC driver");
 MODULE_AUTHOR("Topic Embedded Products");
 MODULE_LICENSE("GPL v2");
-- 
2.27.0

[PATCH v3 3/3] ltc2471 driver yaml

[Darius Berghe]

Add dt binding documentation for ltc2471 driver. This covers all supported
devices.

Signed-off-by: Darius Berghe <darius.berghe@analog.com>
---
 .../bindings/iio/adc/adi,ltc2471.yaml         | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml
new file mode 100644
index 000000000000..d5b35a1fa651
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2020 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/iio/adc/adi,ltc2471.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC2471 16-bit I2C Sigma-Delta ADC
+
+maintainers:
+  - Mike Looijmans <mike.looijmans@topic.nl>
+
+description: |
+  Analog Devices LTC2461 (single-ended) and LTC2463 (differential) 16-bit
+  I2C Sigma-Delta ADC with 60sps output rate.
+  https://www.analog.com/media/en/technical-documentation/data-sheets/24613fa.pdf
+
+  Analog Devices LTC2471 (single-ended) and LTC2473 (differential) 16-bit
+  I2C Sigma-Delta ADC with selectable 208/833sps output rate.
+  https://www.analog.com/media/en/technical-documentation/data-sheets/24713fb.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ltc2461
+      - adi,ltc2463
+      - adi,ltc2471
+      - adi,ltc2473
+
+  reg:
+    maxItems: 1
+
+  avcc-supply:
+    description:
+      Phandle to the Avcc power supply (2.7V - 5.5V)
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    i2c0 {
+      adc@14 {
+        compatible = "adi,ltc2461";
+        reg = <0x14>;
+      };
+    };
+
-- 
2.27.0

Re: [PATCH v3 3/3] ltc2471 driver yaml

[Jonathan Cameron]

On Mon, 27 Jul 2020 16:58:34 +0300
Darius Berghe <darius.berghe@analog.com> wrote:

> Add dt binding documentation for ltc2471 driver. This covers all supported
> devices.
> 
> Signed-off-by: Darius Berghe <darius.berghe@analog.com>

+CC Mike given the doc lists him as maintainer.

> ---
>  .../bindings/iio/adc/adi,ltc2471.yaml         | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml
> new file mode 100644
> index 000000000000..d5b35a1fa651
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2020 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bindings/iio/adc/adi,ltc2471.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices LTC2471 16-bit I2C Sigma-Delta ADC
> +
> +maintainers:
> +  - Mike Looijmans <mike.looijmans@topic.nl>
> +
> +description: |
> +  Analog Devices LTC2461 (single-ended) and LTC2463 (differential) 16-bit
> +  I2C Sigma-Delta ADC with 60sps output rate.
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/24613fa.pdf
> +
> +  Analog Devices LTC2471 (single-ended) and LTC2473 (differential) 16-bit
> +  I2C Sigma-Delta ADC with selectable 208/833sps output rate.
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/24713fb.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ltc2461
> +      - adi,ltc2463
> +      - adi,ltc2471
> +      - adi,ltc2473
> +
> +  reg:
> +    maxItems: 1
> +
> +  avcc-supply:
> +    description:
> +      Phandle to the Avcc power supply (2.7V - 5.5V)

additionalProperties: false

should be fine here I think...
I keep forgetting this one myself.

> +
> +required:
> +  - compatible
> +  - reg
> +
> +examples:
> +  - |
> +    i2c0 {
> +      adc@14 {
> +        compatible = "adi,ltc2461";
> +        reg = <0x14>;
> +      };
> +    };
> +

Re: [PATCH v3 2/3] ltc2471: ltc2461/ltc2463 compatible strings

[Jonathan Cameron]

On Mon, 27 Jul 2020 16:58:33 +0300
Darius Berghe <darius.berghe@analog.com> wrote:

> Add compatible strings for these devices in the existing ltc2471
> driver.
> 
> Signed-off-by: Darius Berghe <darius.berghe@analog.com>

Hi Darius,

A few additional minor comments from me.

> ---
>  drivers/iio/adc/ltc2471.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/adc/ltc2471.c b/drivers/iio/adc/ltc2471.c
> index e1c4e966524d..8c57203b1fe4 100644
> --- a/drivers/iio/adc/ltc2471.c
> +++ b/drivers/iio/adc/ltc2471.c
> @@ -1,5 +1,7 @@
>  /*
> - * Driver for Linear Technology LTC2471 and LTC2473 voltage monitors
> + * Driver for Linear Technology LTC2461, LTC2463, LTC2471 and LTC2473 voltage
> + * monitors.
> + * The LTC2463 is identical to the 2461, but reports a differential signal.
>   * The LTC2473 is identical to the 2471, but reports a differential signal.
>   *
>   * Copyright (C) 2017 Topic Embedded Products
> @@ -17,8 +19,10 @@
>  #include <linux/mod_devicetable.h>
>  
>  enum ltc2471_chips {
> +	ltc2461,
> +	ltc2463,
>  	ltc2471,
> -	ltc2473,
> +	ltc2473

Why drop the comma?  We've just added two new devices. Seems possible there
may be more in the future!

>  };
>  
>  struct ltc2471_data {
> @@ -122,7 +126,7 @@ static int ltc2471_i2c_probe(struct i2c_client *client,
>  	indio_dev->name = id->name;
>  	indio_dev->info = &ltc2471_info;
>  	indio_dev->modes = INDIO_DIRECT_MODE;
> -	if (id->driver_data == ltc2473)
> +	if (id->driver_data == ltc2473 || id->driver_data == ltc2463)
If the only use of driver_data is going to be this check, then just set it
to 2473 for the 2463 and 2473.  It's not uncommon to do this when we have
a bunch of devices that look the same to software.

>  		indio_dev->channels = ltc2473_channel;
>  	else
>  		indio_dev->channels = ltc2471_channel;
> @@ -139,6 +143,8 @@ static int ltc2471_i2c_probe(struct i2c_client *client,
>  }
>  
>  static const struct i2c_device_id ltc2471_i2c_id[] = {
> +	{ "ltc2461", ltc2461 },
> +	{ "ltc2463", ltc2463 },
>  	{ "ltc2471", ltc2471 },
>  	{ "ltc2473", ltc2473 },
>  	{}
> @@ -146,6 +152,8 @@ static const struct i2c_device_id ltc2471_i2c_id[] = {
>  MODULE_DEVICE_TABLE(i2c, ltc2471_i2c_id);
>  
>  static const struct of_device_id ltc2471_of_match[] = {
> +	{ .compatible = "adi,ltc2461" },
> +	{ .compatible = "adi,ltc2463" },
>  	{ .compatible = "adi,ltc2471" },
>  	{ .compatible = "adi,ltc2473" },
>  	{}
> @@ -163,6 +171,6 @@ static struct i2c_driver ltc2471_i2c_driver = {
>  
>  module_i2c_driver(ltc2471_i2c_driver);
>  
> -MODULE_DESCRIPTION("LTC2471/LTC2473 ADC driver");
> +MODULE_DESCRIPTION("LTC2461/LTC2463/LTC2471/LTC2473 ADC driver");
>  MODULE_AUTHOR("Topic Embedded Products");
>  MODULE_LICENSE("GPL v2");

Re: [PATCH v3 3/3] ltc2471 driver yaml

[Rob Herring]

On Mon, 27 Jul 2020 16:58:34 +0300, Darius Berghe wrote:
> Add dt binding documentation for ltc2471 driver. This covers all supported
> devices.
> 
> Signed-off-by: Darius Berghe <darius.berghe@analog.com>
> ---
>  .../bindings/iio/adc/adi,ltc2471.yaml         | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml
> 


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

Documentation/devicetree/bindings/iio/adc/adi,ltc2471.yaml: $id: relative path/filename doesn't match actual path or filename
	expected: http://devicetree.org/schemas/iio/adc/adi,ltc2471.yaml#
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dts:22.13-26: Warning (reg_format): /example-0/i2c0/adc@14:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dt.yaml: Warning (pci_device_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dt.yaml: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dt.yaml: Warning (simple_bus_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dt.yaml: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dt.yaml: Warning (spi_bus_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dts:20.18-23.13: Warning (avoid_default_addr_size): /example-0/i2c0/adc@14: Relying on default #address-cells value
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dts:20.18-23.13: Warning (avoid_default_addr_size): /example-0/i2c0/adc@14: Relying on default #size-cells value
Documentation/devicetree/bindings/iio/adc/adi,ltc2471.example.dt.yaml: Warning (unique_unit_address): Failed prerequisite 'avoid_default_addr_size'


See https://patchwork.ozlabs.org/patch/1336970

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

pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade

Please check and re-submit.

RE: [PATCH v3 2/3] ltc2471: ltc2461/ltc2463 compatible strings

[Berghe, Darius]

Hi Jonathan,

Thanks for review, comments inline.

> -----Original Message-----
> From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Sent: Monday, July 27, 2020 8:27 PM
> To: Berghe, Darius <Darius.Berghe@analog.com>
> Cc: linux-iio@vger.kernel.org; linux-kernel@vger.kernel.org;
> devicetree@vger.kernel.org; jic23@kernel.org; robh@kernel.org
> Subject: Re: [PATCH v3 2/3] ltc2471: ltc2461/ltc2463 compatible strings
> 
> [External]
> 
> On Mon, 27 Jul 2020 16:58:33 +0300
> Darius Berghe <darius.berghe@analog.com> wrote:
> 
> > Add compatible strings for these devices in the existing ltc2471
> > driver.
> >
> > Signed-off-by: Darius Berghe <darius.berghe@analog.com>
> 
> Hi Darius,
> 
> A few additional minor comments from me.
> 
> > ---
> >  drivers/iio/adc/ltc2471.c | 16 ++++++++++++----
> >  1 file changed, 12 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/iio/adc/ltc2471.c b/drivers/iio/adc/ltc2471.c
> > index e1c4e966524d..8c57203b1fe4 100644
> > --- a/drivers/iio/adc/ltc2471.c
> > +++ b/drivers/iio/adc/ltc2471.c
> > @@ -1,5 +1,7 @@
> >  /*
> > - * Driver for Linear Technology LTC2471 and LTC2473 voltage monitors
> > + * Driver for Linear Technology LTC2461, LTC2463, LTC2471 and LTC2473
> > + voltage
> > + * monitors.
> > + * The LTC2463 is identical to the 2461, but reports a differential signal.
> >   * The LTC2473 is identical to the 2471, but reports a differential signal.
> >   *
> >   * Copyright (C) 2017 Topic Embedded Products @@ -17,8 +19,10 @@
> > #include <linux/mod_devicetable.h>
> >
> >  enum ltc2471_chips {
> > +	ltc2461,
> > +	ltc2463,
> >  	ltc2471,
> > -	ltc2473,
> > +	ltc2473
> 
> Why drop the comma?  We've just added two new devices. Seems possible
> there may be more in the future!
> 

Ok, will leave it there in v4.

> >  };
> >
> >  struct ltc2471_data {
> > @@ -122,7 +126,7 @@ static int ltc2471_i2c_probe(struct i2c_client
> *client,
> >  	indio_dev->name = id->name;
> >  	indio_dev->info = &ltc2471_info;
> >  	indio_dev->modes = INDIO_DIRECT_MODE;
> > -	if (id->driver_data == ltc2473)
> > +	if (id->driver_data == ltc2473 || id->driver_data == ltc2463)
> If the only use of driver_data is going to be this check, then just set it to 2473
> for the 2463 and 2473.  It's not uncommon to do this when we have a bunch
> of devices that look the same to software.

Yes the chips are similar but there is at least one feature which requires this level 
of distinguishing them: the sampling rate (60sps for ltc2461/3 and selectable 208/833sps 
for ltc2471/3). It's not used anywhere for now but I can see it being implemented
as standard IIO dev attribute sampling frequency.

> 
> >  		indio_dev->channels = ltc2473_channel;
> >  	else
> >  		indio_dev->channels = ltc2471_channel; @@ -139,6 +143,8
> @@ static
> > int ltc2471_i2c_probe(struct i2c_client *client,  }
> >
> >  static const struct i2c_device_id ltc2471_i2c_id[] = {
> > +	{ "ltc2461", ltc2461 },
> > +	{ "ltc2463", ltc2463 },
> >  	{ "ltc2471", ltc2471 },
> >  	{ "ltc2473", ltc2473 },
> >  	{}
> > @@ -146,6 +152,8 @@ static const struct i2c_device_id ltc2471_i2c_id[]
> > = {  MODULE_DEVICE_TABLE(i2c, ltc2471_i2c_id);
> >
> >  static const struct of_device_id ltc2471_of_match[] = {
> > +	{ .compatible = "adi,ltc2461" },
> > +	{ .compatible = "adi,ltc2463" },
> >  	{ .compatible = "adi,ltc2471" },
> >  	{ .compatible = "adi,ltc2473" },
> >  	{}
> > @@ -163,6 +171,6 @@ static struct i2c_driver ltc2471_i2c_driver = {
> >
> >  module_i2c_driver(ltc2471_i2c_driver);
> >
> > -MODULE_DESCRIPTION("LTC2471/LTC2473 ADC driver");
> > +MODULE_DESCRIPTION("LTC2461/LTC2463/LTC2471/LTC2473 ADC
> driver");
> >  MODULE_AUTHOR("Topic Embedded Products");  MODULE_LICENSE("GPL
> v2");

Re: [PATCH v3 2/3] ltc2471: ltc2461/ltc2463 compatible strings

[Jonathan Cameron]

On Tue, 28 Jul 2020 06:24:03 +0000
"Berghe, Darius" <Darius.Berghe@analog.com> wrote:

> Hi Jonathan,
> 
> Thanks for review, comments inline.
> 
> > -----Original Message-----
> > From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> > Sent: Monday, July 27, 2020 8:27 PM
> > To: Berghe, Darius <Darius.Berghe@analog.com>
> > Cc: linux-iio@vger.kernel.org; linux-kernel@vger.kernel.org;
> > devicetree@vger.kernel.org; jic23@kernel.org; robh@kernel.org
> > Subject: Re: [PATCH v3 2/3] ltc2471: ltc2461/ltc2463 compatible strings
> > 
> > [External]
> > 
> > On Mon, 27 Jul 2020 16:58:33 +0300
> > Darius Berghe <darius.berghe@analog.com> wrote:
> >   
> > > Add compatible strings for these devices in the existing ltc2471
> > > driver.
> > >
> > > Signed-off-by: Darius Berghe <darius.berghe@analog.com>  
> > 
> > Hi Darius,
> > 
> > A few additional minor comments from me.
> >   
> > > ---
> > >  drivers/iio/adc/ltc2471.c | 16 ++++++++++++----
> > >  1 file changed, 12 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/iio/adc/ltc2471.c b/drivers/iio/adc/ltc2471.c
> > > index e1c4e966524d..8c57203b1fe4 100644
> > > --- a/drivers/iio/adc/ltc2471.c
> > > +++ b/drivers/iio/adc/ltc2471.c
> > > @@ -1,5 +1,7 @@
> > >  /*
> > > - * Driver for Linear Technology LTC2471 and LTC2473 voltage monitors
> > > + * Driver for Linear Technology LTC2461, LTC2463, LTC2471 and LTC2473
> > > + voltage
> > > + * monitors.
> > > + * The LTC2463 is identical to the 2461, but reports a differential signal.
> > >   * The LTC2473 is identical to the 2471, but reports a differential signal.
> > >   *
> > >   * Copyright (C) 2017 Topic Embedded Products @@ -17,8 +19,10 @@
> > > #include <linux/mod_devicetable.h>
> > >
> > >  enum ltc2471_chips {
> > > +	ltc2461,
> > > +	ltc2463,
> > >  	ltc2471,
> > > -	ltc2473,
> > > +	ltc2473  
> > 
> > Why drop the comma?  We've just added two new devices. Seems possible
> > there may be more in the future!
> >   
> 
> Ok, will leave it there in v4.
> 
> > >  };
> > >
> > >  struct ltc2471_data {
> > > @@ -122,7 +126,7 @@ static int ltc2471_i2c_probe(struct i2c_client  
> > *client,  
> > >  	indio_dev->name = id->name;
> > >  	indio_dev->info = &ltc2471_info;
> > >  	indio_dev->modes = INDIO_DIRECT_MODE;
> > > -	if (id->driver_data == ltc2473)
> > > +	if (id->driver_data == ltc2473 || id->driver_data == ltc2463)  
> > If the only use of driver_data is going to be this check, then just set it to 2473
> > for the 2463 and 2473.  It's not uncommon to do this when we have a bunch
> > of devices that look the same to software.  
> 
> Yes the chips are similar but there is at least one feature which requires this level 
> of distinguishing them: the sampling rate (60sps for ltc2461/3 and selectable 208/833sps 
> for ltc2471/3). It's not used anywhere for now but I can see it being implemented
> as standard IIO dev attribute sampling frequency.

Fair enough.  Perhaps a note in the patch description so no one asks the question
on the next version?

> 
> >   
> > >  		indio_dev->channels = ltc2473_channel;
> > >  	else
> > >  		indio_dev->channels = ltc2471_channel; @@ -139,6 +143,8  
> > @@ static  
> > > int ltc2471_i2c_probe(struct i2c_client *client,  }
> > >
> > >  static const struct i2c_device_id ltc2471_i2c_id[] = {
> > > +	{ "ltc2461", ltc2461 },
> > > +	{ "ltc2463", ltc2463 },
> > >  	{ "ltc2471", ltc2471 },
> > >  	{ "ltc2473", ltc2473 },
> > >  	{}
> > > @@ -146,6 +152,8 @@ static const struct i2c_device_id ltc2471_i2c_id[]
> > > = {  MODULE_DEVICE_TABLE(i2c, ltc2471_i2c_id);
> > >
> > >  static const struct of_device_id ltc2471_of_match[] = {
> > > +	{ .compatible = "adi,ltc2461" },
> > > +	{ .compatible = "adi,ltc2463" },
> > >  	{ .compatible = "adi,ltc2471" },
> > >  	{ .compatible = "adi,ltc2473" },
> > >  	{}
> > > @@ -163,6 +171,6 @@ static struct i2c_driver ltc2471_i2c_driver = {
> > >
> > >  module_i2c_driver(ltc2471_i2c_driver);
> > >
> > > -MODULE_DESCRIPTION("LTC2471/LTC2473 ADC driver");
> > > +MODULE_DESCRIPTION("LTC2461/LTC2463/LTC2471/LTC2473 ADC  
> > driver");  
> > >  MODULE_AUTHOR("Topic Embedded Products");  MODULE_LICENSE("GPL  
> > v2");  
>