linux-kernel - Re: [PATCH v3 3/6] iio: adc: ad7173: refactor ain and vref selection

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Date: Fri, 31 May 2024 09:10:43 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: "Ceclan, Dumitru" <mitrutzceclan@...il.com>, dumitru.ceclan@...log.com
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
 <Michael.Hennerich@...log.com>, Jonathan Cameron <jic23@...nel.org>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 David Lechner <dlechner@...libre.com>,  linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/6] iio: adc: ad7173: refactor ain and vref selection

On Thu, 2024-05-30 at 17:45 +0300, Ceclan, Dumitru wrote:
> On 29/05/2024 15:49, Nuno Sá wrote:
> > On Wed, 2024-05-29 at 14:27 +0200, Nuno Sá wrote:
> > > On Mon, 2024-05-27 at 20:02 +0300, Dumitru Ceclan via B4 Relay wrote:
> > > > From: Dumitru Ceclan <dumitru.ceclan@...log.com>
> 
> ...
> 
> > > > +static int ad7173_validate_voltage_ain_inputs(struct ad7173_state *st,
> > > > +					      unsigned int ain[2])
> > 
> > Pass the pointer and size of it... Also, it should be made 'const'
> > 
> 
> I'm learning here: what is the purpose of passing the size of it?
> This is a specific case where the size will always be 2
> 

Basically readability... Yes, in this case it will be a stretch to assume we'll ever
have anything bigger than 2 (so the scalability argument is not so applicable) so I'm
ok if you don't pass the size. It's just I really dislike (as a practice) to have
raw/magic numbers in the code. In here, it won't be that bad as by the context, one
can easily understand the meaning of 2. Nevertheless, I would, still, at the very
least consider to either use a #define or a better name for the iterator (anything
more meaningful than 'i' so that it looks more understandable than 'i < 2')

- Nuno Sá 
>