On 02/25/2017 04:11 PM, Jonathan Cameron wrote:
On 24/02/17 16:04, Fabrice Gasnier wrote:
On 02/19/2017 01:09 PM, Jonathan Cameron wrote:
On 15/02/17 16:55, Fabrice Gasnier wrote:
Add documentation for 'st,adc-res' dt optional property.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
I'm happy with this, but would like to leave time for a device tree review.
Ultimately we may well want to make this a generic property and call it something
like adc-resolution but perhaps we need to wait until we have a few more devices
supporting setting it via device tree to figure out what the best interface is.
It would exactly be a problem to support this as a deprecated binding at that
point.
Hi Jonathan,
I agree with you on this... It may be better to have generic property
for this, especially if you see that it will come in the near future.
May I suggest this prop to be less restrictive, e.g. like
resolution-bits as is may also be worth for other device types, e.g.
DAC as an example ?>
Sure, why not - no loss of meaning here. We may never use it for anything
else but that doesn't matter.
Hi Jonathan,
Following Rob's comment, how you see such a common property can be
integrated. Currently I don't see much devices are doing this.
Do you have ideas or preferences on this ?
- Do you think replacing 'st,adc-res' by 'resolution-bits' in current
patchset is enough for now ?
- Or do I need to add dt parsing routine in IIO core, e.g. as simple
as of_iio_get_resolution(), or something like this ? Or parsing routine
that may fill in a common properties structure (but only resolution
will be there from the start)...
Please let me know.
Thanks,
Fabrice
Give me a poke if we hear nothing from Rob or Mark for say another week.
No news yet, but it can wait a little longer.
Rob / Mark, can you take a look at this if you have time?
Thanks,
Jonathan
Please advise,
Regards,
Fabrice
Thanks,
Jonathan
---
Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
index 5dfc88e..45f7ff2 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
@@ -57,6 +57,9 @@ Optional properties:
- dmas: Phandle to dma channel for this ADC instance.
See ../../dma/dma.txt for details.
- dma-names: Must be "rx" when dmas property is being used.
+- st,adc-res: Resolution (bits) to use for conversions. Must match device
+ available resolutions (e.g. can be 6, 8, 10 or 12 on stm32f4). Default
+ is maximum resolution if unset.
Example:
adc: adc@40012000 {
@@ -84,6 +87,7 @@ Example:
st,adc-channels = <8>;
dmas = <&dma2 0 0 0x400 0x0>;
dma-names = "rx";
+ st,adc-res = <8>;
};
...
other adc child nodes follow...
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