linux-kernel - Re: [PATCH v2 1/3] iio: adc: Add Allwinner D1/T113s/R329/T507 SoCs GPADC

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Date:   Sun, 4 Jun 2023 11:42:06 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Maksim Kiselev <bigunclemax@...il.com>, linux-iio@...r.kernel.org,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        Cosmin Tanislav <demonsingur@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        ChiaEn Wu <chiaen_wu@...htek.com>,
        Arnd Bergmann <arnd@...db.de>,
        Ramona Bolboaca <ramona.bolboaca@...log.com>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Ibrahim Tilki <Ibrahim.Tilki@...log.com>,
        William Breathitt Gray <william.gray@...aro.org>,
        Leonard Göhrs <l.goehrs@...gutronix.de>,
        Haibo Chen <haibo.chen@....com>,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        Mike Looijmans <mike.looijmans@...ic.nl>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] iio: adc: Add Allwinner D1/T113s/R329/T507 SoCs
 GPADC


> > +	if (!wait_for_completion_timeout(&info->completion,
> > +					 msecs_to_jiffies(100))) {  
> 
> Dunno if it's better to have this parameter to be defined with self-explanatory
> name.

Probably a response to my earlier comment.  I'd agree with a good name
but GPADC_TIMEOUT which was the earlier naming is less use than a value
and it's not obvious what that name should be.

A nice datasheet reference would be good to have though.

> 
> > +		ret = -ETIMEDOUT;
> > +		goto err;
> > +	}  
>
> 
> > +	if (num_channels > SUN20I_GPADC_MAX_CHANNELS) {
> > +		dev_err(dev, "num of channel children out of range");
> > +		return -EINVAL;
> > +	}  
> 
> Is it really critical error?

Overflow of registers - so yes. I wondered this on v1 and went digging :)
Now, there are no such devices known, so meh on whether check is useful. 

> 
> ...