Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI

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Hi Mauro,

On Mon, Aug 13, 2018 at 05:50:00PM -0300, Mauro Carvalho Chehab wrote:
...
> > > +
> > > +/******************* ipu3_uapi_stats_3a *******************/
> > > +
> > > +#define IPU3_UAPI_MAX_STRIPES				2
> > > +#define IPU3_UAPI_MAX_BUBBLE_SIZE			10
> > > +
> > > +#define IPU3_UAPI_GRID_START_MASK			(BIT(12) - 1)
> > > +#define IPU3_UAPI_GRID_Y_START_EN			BIT(15)
> > > +
> > > +/* controls generation of meta_data (like FF enable/disable) */
> > > +#define IPU3_UAPI_AWB_RGBS_THR_B_EN			BIT(14)
> > > +#define IPU3_UAPI_AWB_RGBS_THR_B_INCL_SAT		BIT(15)
> > > +
> > > +/**
> > > + * struct ipu3_uapi_grid_config - Grid plane config
> > > + *
> > > + * @width:	Grid horizontal dimensions, in number of grid blocks(cells).
> > > + * @height:	Grid vertical dimensions, in number of grid cells.
> > > + * @block_width_log2:	Log2 of the width of each cell in pixels.
> > > + *			for (2^3, 2^4, 2^5, 2^6, 2^7), values [3, 7].
> 
> What are you meaning by [3, 7] here? From some comment you had later,
> I guess you're meaning that only 3 or 7 are the valid values.

This is a notation for a closed interval. Please see:

<URL:https://en.wikipedia.org/wiki/Interval_(mathematics)>

> 
> Yet, you're listing from 2^3 to 2^7, and that's confusing. Perhaps
> you want to say, instead, that the valid values are at the 3..7 range?
> If so, please use something like "values at the [3..7] range".

I'd prefer either 3..7 or [3, 7], but the latter is formal. Whether a range
is closed or (partially) open matters less with integers though.

-- 
Kind regards,

Sakari Ailus
sakari.ailus@xxxxxxxxxxxxxxx



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