linux-kernel - Re: [PATCH v2 5/8] pinctrl: nuvoton: Add driver for WPCM450

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Date:   Mon, 13 Dec 2021 00:02:07 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        Tomer Maimon <tmaimon77@...il.com>,
        Joel Stanley <joel@....id.au>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/8] pinctrl: nuvoton: Add driver for WPCM450

On Wed, Dec 08, 2021 at 04:14:38PM +0200, Andy Shevchenko wrote:
> On Wed, Dec 8, 2021 at 3:58 PM Jonathan Neuschäfer <j.neuschaefer@....net> wrote:
> > On Wed, Dec 08, 2021 at 01:24:18PM +0200, Andy Shevchenko wrote:
> > > On Tuesday, December 7, 2021, Jonathan Neuschäfer <j.neuschaefer@....net>
> > > wrote:
> 
> ...
> 
> > > > +       ours = ((1UL << gpio->num_irqs) - 1) << gpio->first_irq_bit;
> > >
> > > BIT()
> >
> > I'll use it, but in this case, I think it doesn't simplify much the
> > whole expression all that much.
> 
> It is still better to use in my opinion.

Ok.

> 
> > Is there perhaps a macro that
> > constructs a continuous bitmask of N bits, perhaps additionally
> > left-shifted by M bits?
> 
> > Maybe somewhere in the bitmap_* API...
> 
> Maybe, I dunno since I haven't clearly got this code anyway, so up to
> you to check and see what to do about it.

Right, I'll evaluate my options and come up with something.

> ...
> 
> > > > +       struct fwnode_handle *np;
> > >
> > >  Either be fully OF, or don’t name ‘np' here. We usually use fwnode or
> > > ‘child’ in this case.
> >
> > Ah, I thought "np" (= node pointer) was still appropriate because I'm
> > dealing with firmware _nodes_. My intention was indeed to switch fully
> > to the fwnode API.
> 
> Just a convention "de facto".

Ok, I'll change it.


> > > > +               ret = gpiochip_add_pin_range(&gpio->gc, dev_name(pctrl->dev),
> > > > +                                            0, bank->base, bank->length);
> > > > +               if (ret) {
> > > > +                       dev_err(pctrl->dev, "Failed to add pin range for GPIO bank %u\n", reg);
> > > > +                       return ret;
> > > > +               }
> > >
> > > Please move it to the corresponding callback.
> >
> > What's the corresponding callback?
> 
> https://elixir.bootlin.com/linux/latest/source/include/linux/gpio/driver.h#L400

Thanks.


Best regards,
Jonathan Neuschäfer

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