linux-kernel - Re: [PATCH v3 2/2] iio: adc: add ltc2309 support

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Message-ID: <20230910150333.472437be@jic23-huawei>
Date:   Sun, 10 Sep 2023 15:03:33 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Liam Beguin <liambeguin@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/2] iio: adc: add ltc2309 support

On Sun, 3 Sep 2023 12:43:41 +0100
Jonathan Cameron <jic23@...nel.org> wrote:

> On Mon, 28 Aug 2023 22:41:35 -0400
> Liam Beguin <liambeguin@...il.com> wrote:
> 
> > The LTC2309 is an 8-Channel, 12-Bit SAR ADC with an I2C Interface.
> > 
> > This implements support for all single-ended and differential channels,
> > in unipolar mode only.
> > 
> > Signed-off-by: Liam Beguin <liambeguin@...il.com>  
> Hi Liam,
> 
> A few really small editorial bits in here.  I'll fix them whilst applying.
> Series applied to the togreg branch of iio.git
> 
> Note I will be rebasing the tree on rc1 once available and in the meantime
> this will only be pushed out as testing.

A couple more static analysis reports came in (unreachable return in one pace
and a missing static.  I've fixed up in my tree.

Thanks,

Jonathan

> 
> Thanks,
> 
> Jonathan
> 
> 
> 
> > +/**
> > + * struct ltc2309 - internal device data structure
> > + * @dev:	Device reference
> > + * @client:	I2C reference
> > + * @vref:	External reference source
> > + * @lock:	Lock to serialize data access
> > + * @vref_mv	Internal voltage reference  
> 
> Missing : which is what the bot picked up on.
> 
> > + */
> > +struct ltc2309 {
> > +	struct device		*dev;
> > +	struct i2c_client	*client;
> > +	struct regulator	*vref;
> > +	struct mutex		lock; /* serialize data access */
> > +	int			vref_mv;
> > +};  
> 
> > +
> > +void ltc2309_regulator_disable(void *regulator)
> > +{
> > +	struct regulator *r = (struct regulator *)regulator;  
> 
> Never any need to explicitly cast from a void * to any other pointer type.
> (C spec says it is always fine to do this :)
> 
> Given type is obvious from use, can just do
> 	regulator_disable(regulator);
> and lose the local variable.
> 
> > +
> > +	regulator_disable(r);
> > +}  
> 
> ..
> > +
> > +static const struct of_device_id ltc2309_of_match[] = {
> > +	{ .compatible = "lltc,ltc2309" },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, ltc2309_of_match);
> > +
> > +static const struct i2c_device_id ltc2309_id[] = {
> > +	{ "ltc2309" },
> > +	{}  
> 
> Trivial but space between { and } for consistency.
> 
>