On Mon, Nov 7, 2016 at 1:57 PM, Peter Rosin <peda@xxxxxxxxxx> wrote: > On 2016-11-07 12:37, Daniel Baluta wrote: >> On Mon, Oct 24, 2016 at 1:39 AM, Peter Rosin <peda@xxxxxxxxxx> wrote: >>> From: Jonathan Cameron <jic23@xxxxxxxxxx> >>> >>> A large number of attributes can only take a limited range of values. >>> Currently in IIO this is handled by directly registering additional >>> *_available attributes thus providing this information to userspace. >>> >>> It is desirable to provide this information via the core for much the same >>> reason this was done for the actual channel information attributes in the >>> first place. If it isn't there, then it can only really be accessed from >>> userspace. Other in kernel IIO consumers have no access to what valid >>> parameters are. >>> >>> Two forms are currently supported: >>> * list of values in one particular IIO_VAL_* format. >>> e.g. 1.300000 1.500000 1.730000 >>> * range specification with a step size: >>> e.g. [1.000000 0.500000 2.500000] >>> equivalent to 1.000000 1.5000000 2.000000 2.500000 >> >> Is there any driver using this format? :) > > Yes, soon. Hopefully. See patch 3/8 > iio: mcp4531: provide range of available raw values > https://patchwork.kernel.org/patch/9391283/ > >>> >>> An addition set of masks are used to allow different sharing rules for the >>> *_available attributes generated. >>> >>> This allows for example: >>> >>> in_accel_x_offset >>> in_accel_y_offset >>> in_accel_offset_available. >>> >>> We could have gone with having a specification for each and every >>> info_mask element but that would have meant changing the existing userspace >>> ABI. This approach does not. >>> >>> Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx> >>> [forward ported, added some docs and fixed buffer overflows /peda] >>> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx> >> >> The patch looks good to me at a first glance. > > Thanks, may I add your acked-by if/when I respin? Yes. You can have it from here: Acked-by: Daniel Baluta <daniel.baluta@xxxxxxxxx> thanks, Daniel. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
