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

Nishanth Menon
2022-07-06T18:06:54Z

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
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