linux-kernel - Re: [PATCH RFC 4/5] gnss: sirf: add a separate supply for a lna

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Message-ID: <20181130073804.1e57226f@kemnade.info>
Date:   Fri, 30 Nov 2018 07:38:04 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Pavel Machek <pavel@....cz>
Cc:     johan@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [PATCH RFC 4/5] gnss: sirf: add a separate supply for a lna

Hi,

On Tue, 27 Nov 2018 19:03:57 +0100
Pavel Machek <pavel@....cz> wrote:

> Hi!
> 
> > Devices might have a separate lna between antenna output of the gps
> > chip and the antenna which might have a separate supply  
> 
> Might have.
> 
> > @@ -340,6 +349,12 @@ static int sirf_probe(struct serdev_device *serdev)
> >  		goto err_put_device;
> >  	}
> >  
> > +	data->lna = devm_regulator_get(dev, "lna");
> > +	if (IS_ERR(data->lna)) {
> > +		ret = PTR_ERR(data->lna);
> > +		goto err_put_device;
> > +	}
> > +  
> 
> But it is not optional in the code. Probably should be?

well, if it no lna regulator is defined in the dtb, the regulator
framework will return a dummy regulator. devm_regulator_get_optional()
would not do that and would require more error checking in the code.
But if there is some rule which says that devm_regulator_get_optional()
should be used here, I can of course change that.
Before sending a v2, is that the only issue here?

Regards,
Andreas

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