linux-kernel - Re: [PATCH v2] iio: humidity: hdc3020: add threshold events support

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Message-ID: <20240212152001.GA75720@debian>
Date: Mon, 12 Feb 2024 16:20:01 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Javier Carrasco <javier.carrasco.cruz@...il.com>,
	Li peiyu <579lpy@...il.com>, Lars-Peter Clausen <lars@...afoo.de>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: humidity: hdc3020: add threshold events support

Am Sat, Feb 10, 2024 at 04:11:17PM +0000 schrieb Jonathan Cameron:
 
> > > > > [...]
> > > > #define HDC3020_S_T_RH_THRESH_LOW       0x6100
> > > > #define HDC3020_S_T_RH_THRESH_LOW_CLR   0x610B
> > > > #define HDC3020_S_T_RH_THRESH_HIGH_CLR  0x6116
> > > > #define HDC3020_S_T_RH_THRESH_HIGH      0x611D
> > > > 
> > > > #define HDC3020_R_T_RH_THRESH_LOW       0x6102
> > > > #define HDC3020_R_T_RH_THRESH_LOW_CLR   0x6109
> > > > #define HDC3020_R_T_RH_THRESH_HIGH_CLR  0x6114
> > > > #define HDC3020_R_T_RH_THRESH_HIGH      0x611F
> > > > 
> > > > I don't know if it's a good idea, as we would need to make sure it is
> > > > big endian in the buffer. Probably with a function that handles this.  
> > > I think this is the best plan with a
> > > put_unaligned_be16() to deal with the endianness.
> > > The compiler should be able to optimize that heavily.
> > >  
> > I think that would require some refactoring. I would add patches that
> > are fixing this. Have there been reasons for using the pairs ? I'm just
> > curious.
> 
> Not that I can think of. Maybe how they are represented on the
> dataheet?  Often people just copy that stuff without thinking
> about it (I know I've been guilty of this ;)
> 
Ok, just wanted to make sure I didn't miss anything. Yes, probably the
command table drives one into that direction.

Dimitri