linux-kernel - Re: [PATCH v3 1/2] Support NVIDIA BlueField-3 GPIO controller

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Message-ID: <Y+rKOEV/3PnrB/Dl@surfacebook>
Date:   Tue, 14 Feb 2023 01:39:36 +0200
From:   andy.shevchenko@...il.com
To:     Asmaa Mnebhi <asmaa@...dia.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] Support NVIDIA BlueField-3 GPIO controller

Mon, Feb 13, 2023 at 11:14:06PM +0000, Asmaa Mnebhi kirjoitti:
> Thanks Andy for the feedback! Will address your comment in v4.
> 
> > +		generic_handle_irq(irq_find_mapping(gc->irq.domain, level));
> 
> There is a helper that unites these two calls together.
> 
> I didn't find any helper in v6.2. Could you please point me to it?

It's available even longer than just in v6.2:
generic_handle_domain_irq().

...

> > +static int mlxbf3_gpio_init_valid_mask(struct gpio_chip *gc,
> > +				       unsigned long *valid_mask,
> > +				       unsigned int ngpios)
> > +{
> > +	struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc);
> > +
> > +	*valid_mask = gs->valid_mask;
> > +
> > +	return 0;
> > +}
> 
> Why do you need this?
> 
> Since we only use ACPI tables and we want user space (libgpiod tool) or possibly (in the future)
> other kernel drivers to have access to certain GPIO pins, we use this valid_mask to do so.
> Linus previously explained that if we ask for a GPIO then it will be muxed in using .gpio_request_enable().
> And so we would use .valid_mask to restrict the use of certain gpios.

So, why you can't use gpio-reserved-ranges property?

-- 
With Best Regards,
Andy Shevchenko