[PATCH 0/2] iio: adc: ti-adc128s052: Add support for adc102s021 and family

[PATCH 0/2] iio: adc: ti-adc128s052: Add support for adc102s021 and family

[Nishanth Menon]

Hi,

This is probably a continuation of [1] and has a dependency on [2].

Inspiration for this series is drivers/hwmon/adcxx.c though constrained
to the family that I had access to test with.

As stated in drivers/hwmon/adcxx.c, the family of devices are easier to
support since they all (no matter the resolution) seem to respond in 12
bits with the LSBs set to 0 for the reduced resolution devices.

Note: This series does'nt attempt to cleanup the sparse and extended
build warnings existing in the driver.

Series based on [2] and next-20220630

Nishanth Menon (2):
  dt-bindings: iio: adc: ti,adc128s052: Add adc08c and adc10c family
  iio: adc: ti-adc128s052: Add lower resolution devices support

 .../bindings/iio/adc/ti,adc128s052.yaml       |  6 +++++
 drivers/iio/adc/ti-adc128s052.c               | 26 +++++++++++++++++++
 2 files changed, 32 insertions(+)

[1] https://patchwork.kernel.org/project/linux-hwmon/patch/20181115135013.30723-2-fe@dev.tdt.de/
[2] https://lore.kernel.org/linux-iio/20220630230107.13438-1-nm@ti.com/
-- 
2.31.1

[PATCH 1/2] dt-bindings: iio: adc: ti,adc128s052: Add adc08c and adc10c family

[Nishanth Menon]

The adcxx4s communicates with a host processor via an SPI/Microwire Bus
interface. The device family responds with 12bit data, of which the LSB
bits are 0 for the lower resolution devices. I have been able to test
adc102s051, hence adding just the missing ones in that family.

Lets reuse the binding to support the family of devices with name
ADC<bb><c>S<sss>, where
* bb is the resolution in number of bits (8, 10, 12)
* c is the number of channels (1, 2, 4, 8)
* sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
  and 101 for 1 MSPS)

Complete datasheets are available at TI's website here:
  https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf

Handling of 8, 10 and 12 bits converters are the same, the
unavailable bits are 0 in LSB :)

Inspired-by: drivers/hwmon/adcxx.c

Signed-off-by: Nishanth Menon <nm@ti.com>
---

Checkpatch does complain with Inspired-by: insisting it to be an email
address.. but I was really inspired by the hwmon driver.. Don't know
what else to say here.. we could probably drop it?

 .../devicetree/bindings/iio/adc/ti,adc128s052.yaml          | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/ti,adc128s052.yaml b/Documentation/devicetree/bindings/iio/adc/ti,adc128s052.yaml
index d54a0183f024..85adf53c83c1 100644
--- a/Documentation/devicetree/bindings/iio/adc/ti,adc128s052.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/ti,adc128s052.yaml
@@ -16,6 +16,12 @@ description: |
 properties:
   compatible:
     enum:
+      - ti,adc082s021
+      - ti,adc082s051
+      - ti,adc082s101
+      - ti,adc102s021
+      - ti,adc102s051
+      - ti,adc102s101
       - ti,adc122s021
       - ti,adc122s051
       - ti,adc122s101
-- 
2.31.1

Re: [PATCH 1/2] dt-bindings: iio: adc: ti,adc128s052: Add adc08c and adc10c family

[Krzysztof Kozlowski]

On 01/07/2022 06:29, Nishanth Menon wrote:
> The adcxx4s communicates with a host processor via an SPI/Microwire Bus
> interface. The device family responds with 12bit data, of which the LSB
> bits are 0 for the lower resolution devices. I have been able to test
> adc102s051, hence adding just the missing ones in that family.
> 
> Lets reuse the binding to support the family of devices with name
> ADC<bb><c>S<sss>, where
> * bb is the resolution in number of bits (8, 10, 12)
> * c is the number of channels (1, 2, 4, 8)
> * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
>   and 101 for 1 MSPS)
> 
> Complete datasheets are available at TI's website here:
>   https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf
> 
> Handling of 8, 10 and 12 bits converters are the same, the
> unavailable bits are 0 in LSB :)
> 
> Inspired-by: drivers/hwmon/adcxx.c
> 
> Signed-off-by: Nishanth Menon <nm@ti.com>
> ---
> 
> Checkpatch does complain with Inspired-by: insisting it to be an email
> address.. but I was really inspired by the hwmon driver.. Don't know
> what else to say here.. we could probably drop it?

Drop it or convert to just test.

When passing checkpatch:

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof

Re: [PATCH 1/2] dt-bindings: iio: adc: ti,adc128s052: Add adc08c and adc10c family

[Krzysztof Kozlowski]

On 01/07/2022 08:38, Krzysztof Kozlowski wrote:
> On 01/07/2022 06:29, Nishanth Menon wrote:
>> The adcxx4s communicates with a host processor via an SPI/Microwire Bus
>> interface. The device family responds with 12bit data, of which the LSB
>> bits are 0 for the lower resolution devices. I have been able to test
>> adc102s051, hence adding just the missing ones in that family.
>>
>> Lets reuse the binding to support the family of devices with name
>> ADC<bb><c>S<sss>, where
>> * bb is the resolution in number of bits (8, 10, 12)
>> * c is the number of channels (1, 2, 4, 8)
>> * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
>>   and 101 for 1 MSPS)
>>
>> Complete datasheets are available at TI's website here:
>>   https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf
>>
>> Handling of 8, 10 and 12 bits converters are the same, the
>> unavailable bits are 0 in LSB :)
>>
>> Inspired-by: drivers/hwmon/adcxx.c
>>
>> Signed-off-by: Nishanth Menon <nm@ti.com>
>> ---
>>
>> Checkpatch does complain with Inspired-by: insisting it to be an email
>> address.. but I was really inspired by the hwmon driver.. Don't know
>> what else to say here.. we could probably drop it?
> 
> Drop it or convert to just test.

This should be:

Drop it or convert to just text sentence.

Best regards,
Krzysztof

[PATCH 2/2] iio: adc: ti-adc128s052: Add lower resolution devices support

[Nishanth Menon]

The adcxx4s communicates with a host processor via an SPI/Microwire Bus
interface. The device family responds with 12bit data, of which the LSB
bits are transmitted by the lower resolution devices as 0. We don't need
to mess with ADC108S102_BITS as a result for the lower resolution
devices.

I have been able to test adc102s051, hence adding just the missing
ones in that family.

Lets reuse the driver to support the family of devices with name
ADC<bb><c>S<sss>, where
* bb is the resolution in number of bits (8, 10, 12)
* c is the number of channels (1, 2, 4, 8)
* sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
  and 101 for 1 MSPS)

Complete datasheets are available at TI's website here:
  https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf

Also see: drivers/hwmon/adcxx.c

Signed-off-by: Nishanth Menon <nm@ti.com>
---

This does add on additional sparse warnings around casting .data value
to const from int for the of_match_table, and a bunch around the .cls
field for acpi_device_id - maybe someone could suggest a smarter way to
fix those.

Applies after https://lore.kernel.org/linux-iio/20220630230107.13438-1-nm@ti.com/

 drivers/iio/adc/ti-adc128s052.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
index 21a7764cbb93..0a3aab4df60e 100644
--- a/drivers/iio/adc/ti-adc128s052.c
+++ b/drivers/iio/adc/ti-adc128s052.c
@@ -7,6 +7,20 @@
  * https://www.ti.com/lit/ds/symlink/adc128s052.pdf
  * https://www.ti.com/lit/ds/symlink/adc122s021.pdf
  * https://www.ti.com/lit/ds/symlink/adc124s021.pdf
+ *
+ * The adcxx4s communicates with a host processor via an SPI/Microwire Bus
+ * interface. This driver supports the whole family of devices with name
+ * ADC<bb><c>S<sss>, where
+ * bb is the resolution in number of bits (8, 10, 12)
+ * c is the number of channels (1, 2, 4, 8)
+ * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
+ * and 101 for 1 MSPS)
+ *
+ * Complete datasheets are available at TI's website here:
+ *   https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf
+ *
+ * Handling of 8, 10 and 12 bits converters are the same, the
+ * unavailable bits are 0 in LSB :)
  */
 
 #include <linux/acpi.h>
@@ -185,6 +199,12 @@ static const struct of_device_id adc128_of_match[] = {
 	{ .compatible = "ti,adc122s021", .data = 1},
 	{ .compatible = "ti,adc122s051", .data = 1},
 	{ .compatible = "ti,adc122s101", .data = 1},
+	{ .compatible = "ti,adc102s021", .data = 1},
+	{ .compatible = "ti,adc102s051", .data = 1},
+	{ .compatible = "ti,adc102s101", .data = 1},
+	{ .compatible = "ti,adc082s021", .data = 1},
+	{ .compatible = "ti,adc082s051", .data = 1},
+	{ .compatible = "ti,adc082s101", .data = 1},
 	{ .compatible = "ti,adc124s021", .data = 2},
 	{ .compatible = "ti,adc124s051", .data = 2},
 	{ .compatible = "ti,adc124s101", .data = 2},
@@ -197,6 +217,12 @@ static const struct spi_device_id adc128_id[] = {
 	{ "adc122s021",	1 },
 	{ "adc122s051",	1 },
 	{ "adc122s101",	1 },
+	{ "adc102s021",	1 },
+	{ "adc102s051",	1 },
+	{ "adc102s101",	1 },
+	{ "adc082s021",	1 },
+	{ "adc082s051",	1 },
+	{ "adc082s101",	1 },
 	{ "adc124s021", 2 },
 	{ "adc124s051", 2 },
 	{ "adc124s101", 2 },
-- 
2.31.1

Re: [PATCH 2/2] iio: adc: ti-adc128s052: Add lower resolution devices support

[Jonathan Cameron]

On Thu, 30 Jun 2022 23:29:19 -0500
Nishanth Menon <nm@ti.com> wrote:

> The adcxx4s communicates with a host processor via an SPI/Microwire Bus
> interface. The device family responds with 12bit data, of which the LSB
> bits are transmitted by the lower resolution devices as 0. We don't need
> to mess with ADC108S102_BITS as a result for the lower resolution
> devices.

whilst not strictly necessary I would prefer we did as it may reduce
storage requirements, computation complexity etc for userspace (particularly
if they are 8 bits).

Would affect scale and shift so slightly more complex, but not a lot
so still a fairly simple change.  Just add resolution to your config
structure and duplicate it where necessary to allow whatever resolutions
we support.

> 
> I have been able to test adc102s051, hence adding just the missing
> ones in that family.
> 
> Lets reuse the driver to support the family of devices with name
> ADC<bb><c>S<sss>, where
> * bb is the resolution in number of bits (8, 10, 12)
> * c is the number of channels (1, 2, 4, 8)
> * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
>   and 101 for 1 MSPS)
> 
> Complete datasheets are available at TI's website here:
>   https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf
> 
> Also see: drivers/hwmon/adcxx.c
> 
> Signed-off-by: Nishanth Menon <nm@ti.com>
> ---
> 
> This does add on additional sparse warnings around casting .data value
> to const from int for the of_match_table, and a bunch around the .cls
> field for acpi_device_id - maybe someone could suggest a smarter way to
> fix those.
> 
> Applies after https://lore.kernel.org/linux-iio/20220630230107.13438-1-nm@ti.com/
> 
>  drivers/iio/adc/ti-adc128s052.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
> index 21a7764cbb93..0a3aab4df60e 100644
> --- a/drivers/iio/adc/ti-adc128s052.c
> +++ b/drivers/iio/adc/ti-adc128s052.c
> @@ -7,6 +7,20 @@
>   * https://www.ti.com/lit/ds/symlink/adc128s052.pdf
>   * https://www.ti.com/lit/ds/symlink/adc122s021.pdf
>   * https://www.ti.com/lit/ds/symlink/adc124s021.pdf
> + *
> + * The adcxx4s communicates with a host processor via an SPI/Microwire Bus
> + * interface. This driver supports the whole family of devices with name
> + * ADC<bb><c>S<sss>, where
> + * bb is the resolution in number of bits (8, 10, 12)
> + * c is the number of channels (1, 2, 4, 8)
> + * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS
> + * and 101 for 1 MSPS)
> + *
> + * Complete datasheets are available at TI's website here:
> + *   https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf
> + *
> + * Handling of 8, 10 and 12 bits converters are the same, the
> + * unavailable bits are 0 in LSB :)
>   */
>  
>  #include <linux/acpi.h>
> @@ -185,6 +199,12 @@ static const struct of_device_id adc128_of_match[] = {
>  	{ .compatible = "ti,adc122s021", .data = 1},
>  	{ .compatible = "ti,adc122s051", .data = 1},
>  	{ .compatible = "ti,adc122s101", .data = 1},
> +	{ .compatible = "ti,adc102s021", .data = 1},
> +	{ .compatible = "ti,adc102s051", .data = 1},
> +	{ .compatible = "ti,adc102s101", .data = 1},

Numeric order preferred. Not sure why these are in the middle.

> +	{ .compatible = "ti,adc082s021", .data = 1},
> +	{ .compatible = "ti,adc082s051", .data = 1},
> +	{ .compatible = "ti,adc082s101", .data = 1},

Andy's comment on using pointers instead follows through to here.
To describe the channels more fully you'll need additional
_config[] structures.


>  	{ .compatible = "ti,adc124s021", .data = 2},
>  	{ .compatible = "ti,adc124s051", .data = 2},
>  	{ .compatible = "ti,adc124s101", .data = 2},
> @@ -197,6 +217,12 @@ static const struct spi_device_id adc128_id[] = {
>  	{ "adc122s021",	1 },
>  	{ "adc122s051",	1 },
>  	{ "adc122s101",	1 },
> +	{ "adc102s021",	1 },
> +	{ "adc102s051",	1 },
> +	{ "adc102s101",	1 },
> +	{ "adc082s021",	1 },
> +	{ "adc082s051",	1 },
> +	{ "adc082s101",	1 },
>  	{ "adc124s021", 2 },
>  	{ "adc124s051", 2 },
>  	{ "adc124s101", 2 },

Re: [PATCH 2/2] iio: adc: ti-adc128s052: Add lower resolution devices support

[Nishanth Menon]

On 17:40-20220701, Jonathan Cameron wrote:
> On Thu, 30 Jun 2022 23:29:19 -0500
> Nishanth Menon <nm@ti.com> wrote:
> 
> > The adcxx4s communicates with a host processor via an SPI/Microwire Bus
> > interface. The device family responds with 12bit data, of which the LSB
> > bits are transmitted by the lower resolution devices as 0. We don't need
> > to mess with ADC108S102_BITS as a result for the lower resolution
> > devices.
> 
> whilst not strictly necessary I would prefer we did as it may reduce
> storage requirements, computation complexity etc for userspace (particularly
> if they are 8 bits).
> 
> Would affect scale and shift so slightly more complex, but not a lot
> so still a fairly simple change.  Just add resolution to your config
> structure and duplicate it where necessary to allow whatever resolutions
> we support.
> 
> > 
[...]

> >  #include <linux/acpi.h>
> > @@ -185,6 +199,12 @@ static const struct of_device_id adc128_of_match[] = {
> >  	{ .compatible = "ti,adc122s021", .data = 1},
> >  	{ .compatible = "ti,adc122s051", .data = 1},
> >  	{ .compatible = "ti,adc122s101", .data = 1},
> > +	{ .compatible = "ti,adc102s021", .data = 1},
> > +	{ .compatible = "ti,adc102s051", .data = 1},
> > +	{ .compatible = "ti,adc102s101", .data = 1},
> 
> Numeric order preferred. Not sure why these are in the middle.
> 
> > +	{ .compatible = "ti,adc082s021", .data = 1},
> > +	{ .compatible = "ti,adc082s051", .data = 1},
> > +	{ .compatible = "ti,adc082s101", .data = 1},
> 
> Andy's comment on using pointers instead follows through to here.
> To describe the channels more fully you'll need additional
> _config[] structures.


Thanks folks for the feedback. Will try to do a better job on the next
rev.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D