From: Sergio Paracuellos <sergio.paracuellos@gmail.com>
To: Gregory Fong <gregory.0xf0@gmail.com>
Cc: "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Bartosz Golaszewski" <bgolaszewski@baylibre.com>,
"Florian Fainelli" <f.fainelli@gmail.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"René van Dorst" <opensource@vdorst.com>,
"Andy Shevchenko" <andy.shevchenko@gmail.com>,
"John Thomson" <git@johnthomson.fastmail.com.au>,
NeilBrown <neil@brown.name>,
"Nicholas Mc Guire" <hofrat@osadl.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 1/3] gpiolib: convert 'devprop_gpiochip_set_names' to support multiple gpiochip banks per device
Date: Wed, 28 Jul 2021 06:05:03 +0200 [thread overview]
Message-ID: <CAMhs-H-cXSAEBqLehdJ0vGEUYiH2pcnSs06hMhLQ=10Cg4m+Hw@mail.gmail.com> (raw)
In-Reply-To: <CADtm3G5vMnFzxZV2hijZ3daVOgJ=0MnMJmkLyxe0+bNew5g_TA@mail.gmail.com>
On Wed, Jul 28, 2021 at 1:15 AM Gregory Fong <gregory.0xf0@gmail.com> wrote:
>
> On Tue, Jul 27, 2021 at 8:20 AM Sergio Paracuellos
> <sergio.paracuellos@gmail.com> wrote:
> >
> > The default gpiolib-of implementation does not work with the multiple
> > gpiochip banks per device structure used for example by the gpio-mt7621
> > and gpio-brcmstb drivers. To fix these kind of situations driver code
> > is forced to fill the names to avoid the gpiolib code to set names
> > repeated along the banks. Instead of continue with that antipattern
> > fix the gpiolib core function to get expected behaviour for every
> > single situation adding a field 'offset' in the gpiochip structure.
> > Doing in this way, we can assume this offset will be zero for normal
> > driver code where only one gpiochip bank per device is used but
> > can be set explicitly in those drivers that really need more than
> > one gpiochip.
> >
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
>
> One minor comment below, then this looks great:
> Reviewed-by: Gregory Fong <gregory.0xf0@gmail.com>
>
> > Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
> > ---
> > drivers/gpio/gpiolib.c | 32 +++++++++++++++++++++++++++-----
> > include/linux/gpio/driver.h | 4 ++++
> > 2 files changed, 31 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index 27c07108496d..84ed4b73fa3e 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -382,10 +382,18 @@ static int devprop_gpiochip_set_names(struct gpio_chip *chip)
> > if (count < 0)
> > return 0;
> >
> > - if (count > gdev->ngpio) {
> > - dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
> > - count, gdev->ngpio);
> > - count = gdev->ngpio;
> > + /*
> > + * When offset is set in the driver side we assume the driver internally
> > + * is using more than one gpiochip per the same device. We have to stop
> > + * setting friendly names if the specified ones with 'gpio-line-names'
> > + * are less than the offset in the device itself. This means all the
> > + * lines are not present for every single pin within all the internal
> > + * gpiochips.
> > + */
> > + if (count <= chip->offset) {
> > + dev_warn(&gdev->dev, "gpio-line-names too short (length %d) cannot map names for the gpiochip at offset %u\n",
>
> nit: there should be some punctuation after "(length %d)", otherwise
> with parentheticals removed it reads as
>
> "gpio-line-names too short cannot map names ..."
>
> but we need to provide a space between these thoughts for clarity. A
> comma should be ok:
>
> "gpio-line-names too short (length %d), cannot map names ..."
Will add it, thanks.
Best regards,
Sergio Paracuellos
>
> Best regards,
> Gregory
next prev parent reply other threads:[~2021-07-28 4:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 15:20 [PATCH v3 0/3] gpiolib: convert 'devprop_gpiochip_set_names' to support multiple gpiochip banks per device Sergio Paracuellos
2021-07-27 15:20 ` [PATCH v3 1/3] " Sergio Paracuellos
2021-07-27 23:15 ` Gregory Fong
2021-07-28 4:05 ` Sergio Paracuellos [this message]
2021-07-27 15:20 ` [PATCH v3 2/3] gpio: mt7621: support gpio-line-names property Sergio Paracuellos
2021-07-27 15:20 ` [PATCH v3 3/3] gpio: brcmstb: remove custom 'brcmstb_gpio_set_names' Sergio Paracuellos
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