linux-kernel - Re: [PATCH v2 2/3] ASoC: codecs: Add support for the Renesas IDT821034 codec

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Date:   Mon, 23 Jan 2023 13:59:38 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 2/3] ASoC: codecs: Add support for the Renesas
 IDT821034 codec

On Mon, 23 Jan 2023 12:30:32 +0000
Christophe Leroy <christophe.leroy@...roup.eu> wrote:

> Le 23/01/2023 à 13:17, Herve Codina a écrit :
> > Hi Christophe,
> > 
> > On Mon, 23 Jan 2023 11:13:23 +0000
> > Christophe Leroy <christophe.leroy@...roup.eu> wrote:
> >   
> >> Hi Hervé,
> >>
> >> Le 23/01/2023 à 09:56, Herve Codina a écrit :  
> >>>
> >>> gpiochip_get_data() is defined only when CONFIG_GPIOLIB is set.
> >>> That's why the #if section is used.  
> >>
> >> gpiochip_get_data() is still declared when CONFIG_GPIOLIB is not set, so
> >> it is not a problem, the call to it will be eliminated at buildtime.
> >>
> >> By the way, at the time being I get the following warnings:
> >>
> >>     CC      sound/soc/codecs/idt821034.o
> >> sound/soc/codecs/idt821034.c:310:12: warning: 'idt821034_read_slic_raw'
> >> defined but not used [-Wunused-function]
> >>     310 | static int idt821034_read_slic_raw(struct idt821034 *idt821034,
> >> u8 ch, u8 *slic_raw)
> >>         |            ^~~~~~~~~~~~~~~~~~~~~~~
> >> sound/soc/codecs/idt821034.c:305:11: warning:
> >> 'idt821034_get_written_slic_raw' defined but not used [-Wunused-function]
> >>     305 | static u8 idt821034_get_written_slic_raw(struct idt821034
> >> *idt821034, u8 ch)
> >>         |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >> sound/soc/codecs/idt821034.c:276:12: warning: 'idt821034_write_slic_raw'
> >> defined but not used [-Wunused-function]
> >>     276 | static int idt821034_write_slic_raw(struct idt821034
> >> *idt821034, u8 ch, u8 slic_raw)
> >>         |            ^~~~~~~~~~~~~~~~~~~~~~~~
> >> sound/soc/codecs/idt821034.c:271:11: warning: 'idt821034_get_slic_conf'
> >> defined but not used [-Wunused-function]
> >>     271 | static u8 idt821034_get_slic_conf(struct idt821034 *idt821034,
> >> u8 ch)
> >>         |           ^~~~~~~~~~~~~~~~~~~~~~~
> >> sound/soc/codecs/idt821034.c:250:12: warning: 'idt821034_set_slic_conf'
> >> defined but not used [-Wunused-function]
> >>     250 | static int idt821034_set_slic_conf(struct idt821034 *idt821034,
> >> u8 ch, u8 slic_dir)
> >>         |            ^~~~~~~~~~~~~~~~~~~~~~~
> >>
> >>
> >> With the following changes I have no warning and an objdump -x on
> >> idt821034.o shows no reference to gpiochip_get_data()
> >>
> >> diff --git a/sound/soc/codecs/idt821034.c b/sound/soc/codecs/idt821034.c
> >> index 5eb93fec6042..8b75388e22ce 100644
> >> --- a/sound/soc/codecs/idt821034.c
> >> +++ b/sound/soc/codecs/idt821034.c
> >> @@ -968,7 +968,6 @@ static const struct snd_soc_component_driver
> >> idt821034_component_driver = {
> >>    	.endianness		= 1,
> >>    };
> >>
> >> -#if IS_ENABLED(CONFIG_GPIOLIB)
> >>    #define IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(_offset) (((_offset) /
> >> 5) % 4)
> >>    #define IDT821034_GPIO_OFFSET_TO_SLIC_MASK(_offset)    BIT((_offset) % 5)
> >>
> >> @@ -1133,12 +1132,6 @@ static int idt821034_gpio_init(struct idt821034
> >> *idt821034)
> >>    	return devm_gpiochip_add_data(&idt821034->spi->dev,
> >> &idt821034->gpio_chip,
> >>    				      idt821034);
> >>    }
> >> -#else /* IS_ENABLED(CONFIG_GPIOLIB) */
> >> -static int idt821034_gpio_init(struct idt821034 *idt821034)
> >> -{
> >> -	return 0;
> >> -}
> >> -#endif
> >>
> >>    static int idt821034_spi_probe(struct spi_device *spi)
> >>    {
> >> @@ -1165,6 +1158,9 @@ static int idt821034_spi_probe(struct spi_device *spi)
> >>    	if (ret)
> >>    		return ret;
> >>
> >> +	if (!IS_ENABLED(CONFIG_GPIOLIB))
> >> +		return 0;
> >> +
> >>    	ret = idt821034_gpio_init(idt821034);
> >>    	if (ret)
> >>    		return ret;
> >>
> >>
> >> Christophe  
> > 
> > Right, I did the test too and indeed, I can remove the #if section.
> > 
> > I will use (I think is clearer) at idt821034_spi_probe():
> > 	if (!IS_ENABLED(CONFIG_GPIOLIB)) {
> >     		ret = idt821034_gpio_init(idt821034);
> > 		if (ret)
> >     			return ret;
> > 	}
> >   
> 
> 
> I guess you mean :
> 
> 	if (IS_ENABLED(CONFIG_GPIOLIB))

Yes of course. Sorry for the typo.

> 
> 
> > Is that ok for you ?  
> 
> 
> 
> What about:
> 
> 	if (IS_ENABLED(CONFIG_GPIOLIB))
> 		return idt821034_gpio_init(idt821034);
> 	else
> 		return 0;
> 
> Christophe

Well, maybe this version ?

static int idt821034_spi_probe(struct spi_device *spi)
{
	...

	if (IS_ENABLED(CONFIG_GPIOLIB))
 		return idt821034_gpio_init(idt821034);

	return 0;
}

Thanks,
Hervé

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