linux-kernel - Re: [PATCH v2 23/28] net: wan: framer: Add support for the Lantiq PEF2256 framer

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Message-ID: <20230801124401.3883d16c@bootlin.com>
Date:   Tue, 1 Aug 2023 12:44:01 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Randy Dunlap <rdunlap@...radead.org>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 23/28] net: wan: framer: Add support for the Lantiq
 PEF2256 framer

On Tue, 1 Aug 2023 12:22:39 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > +static inline u8 pef2256_read8(struct pef2256 *pef2256, int offset)
> > +{
> > +	int val;
> > +
> > +	regmap_read(pef2256->regmap, offset, &val);
> > +	return val;
> > +}
> > +
> > +static inline void pef2256_write8(struct pef2256 *pef2256, int offset, u8 val)
> > +{
> > +	regmap_write(pef2256->regmap, offset, val);
> > +}  
> 
> More cases of inline functions in .C files. Please let the compiler
> decide.

Will be changed.

> 
> > +static void pef2256_isr_default_handler(struct pef2256 *pef2256, u8 nbr, u8 isr)
> > +{
> > +	dev_warn(pef2256->dev, "ISR%u: 0x%02x not handled\n", nbr, isr);
> > +}  
> 
> Should this be rate limited? It is going to be very noise if it gets
> called once per frame time.

This function should not be called.
It is wired on some interrupts and these interrupts should not be triggered.
It they fired, something was wrong.

I would prefer to keep this dev_warn() to keep the user informed about the
problem.

Regards,
Hervé


-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com