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Date:   Wed, 4 Dec 2019 10:17:46 +0100
From:   Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= 
        <u.kleine-koenig@pengutronix.de>
To:     Peng Fan <peng.fan@nxp.com>
Cc:     "rjui@broadcom.com" <rjui@broadcom.com>,
        "linus.walleij@linaro.org" <linus.walleij@linaro.org>,
        "bgolaszewski@baylibre.com" <bgolaszewski@baylibre.com>,
        "f.fainelli@gmail.com" <f.fainelli@gmail.com>,
        "sbranden@broadcom.com" <sbranden@broadcom.com>,
        "thierry.reding@gmail.com" <thierry.reding@gmail.com>,
        "robh@kernel.org" <robh@kernel.org>,
        "bcm-kernel-feedback-list@broadcom.com" 
        <bcm-kernel-feedback-list@broadcom.com>,
        dl-linux-imx <linux-imx@nxp.com>,
        "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
        "linux-pwm@vger.kernel.org" <linux-pwm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Alice Guo <alice.guo@nxp.com>
Subject: Re: [PATCH v2 2/2] gpio: bcm-kona: use platform_irq_count
Message-ID: <20191204091746.vql5yuajtzmr25lp@pengutronix.de>
References: <1575433106-16171-1-git-send-email-peng.fan@nxp.com>
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 <20191204072744.b7ytzi5gffjcq6sj@pengutronix.de>
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On Wed, Dec 04, 2019 at 08:41:14AM +0000, Peng Fan wrote:
> > Subject: Re: [PATCH v2 2/2] gpio: bcm-kona: use platform_irq_count
> > 
> > On Wed, Dec 04, 2019 at 04:20:45AM +0000, Peng Fan wrote:
> > > From: Peng Fan <peng.fan@nxp.com>
> > >
> > > platform_irq_count() is the more generic way (independent of device
> > > trees) to determine the count of available interrupts. So use this
> > > instead.
> > >
> > > As platform_irq_count() might return an error code (which of_irq_count
> > > doesn't) some additional handling is necessary.
> > >
> > > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> > > ---
> > >
> > > V2:
> > >  Update commit log, and add err handling  Not tested, just code
> > > inspection
> > >
> > >  drivers/gpio/gpio-bcm-kona.c | 12 +++++++++---
> > >  1 file changed, 9 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/gpio/gpio-bcm-kona.c
> > > b/drivers/gpio/gpio-bcm-kona.c index 4122683eb1f9..52ff56166263
> > 100644
> > > --- a/drivers/gpio/gpio-bcm-kona.c
> > > +++ b/drivers/gpio/gpio-bcm-kona.c
> > > @@ -19,7 +19,6 @@
> > >  #include <linux/io.h>
> > >  #include <linux/gpio/driver.h>
> > >  #include <linux/of_device.h>
> > > -#include <linux/of_irq.h>
> > >  #include <linux/init.h>
> > >  #include <linux/irqdomain.h>
> > >  #include <linux/irqchip/chained_irq.h> @@ -586,11 +585,18 @@ static
> > > int bcm_kona_gpio_probe(struct platform_device *pdev)
> > >
> > >  	kona_gpio->gpio_chip = template_chip;
> > >  	chip = &kona_gpio->gpio_chip;
> > > -	kona_gpio->num_bank = of_irq_count(dev->of_node);
> > > -	if (kona_gpio->num_bank == 0) {
> > > +	ret = platform_irq_count(pdev);
> > > +	if (!ret) {
> > >  		dev_err(dev, "Couldn't determine # GPIO banks\n");
> > >  		return -ENOENT;
> > > +	} else if (ret < 0) {
> > > +		if (ret != -EPROBE_DEFER)
> > > +			dev_err(dev, "Couldn't determine GPIO banks: %d\n",
> > > +				ret);
> > 
> > You can use the new %pe feature here:
> 
> Checkpatch reports warning:
> 
> WARNING: Invalid vsprintf pointer extension '%pe'
> #49: FILE: drivers/gpio/gpio-bcm-kona.c:593:
> +               if (ret != -EPROBE_DEFER)
> +                       dev_err(dev, "Couldn't determine GPIO banks: (%pe)\n",
> +                               ERR_PTR(ret));

Then you test with a tree older than
1d28122131b263f169a7f2d288178a56c69ee076. Then you also might not have
57f5677e535ba24b8926a7125be2ef8d7f09323c which you need to make %pe
work.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |