linux-kernel - Re: [PATCH v2 3/5] gpio: msc313: MStar MSC313 GPIO driver

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Date:   Fri, 6 Nov 2020 00:23:52 +0900
From:   Daniel Palmer <daniel@...f.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] gpio: msc313: MStar MSC313 GPIO driver

Hi Marc,

On Thu, 5 Nov 2020 at 21:08, Marc Zyngier <maz@...nel.org> wrote:
>
> On 2020-11-05 09:40, Linus Walleij wrote:
> > On Mon, Oct 19, 2020 at 4:10 PM Daniel Palmer <daniel@...f.com> wrote:
>
> [...]
>
> >> +/* The parent interrupt controller needs the GIC interrupt type set
> >> to GIC_SPI
> >> + * so we need to provide the fwspec. Essentially
> >> gpiochip_populate_parent_fwspec_twocell
> >> + * that puts GIC_SPI into the first cell.
> >> + */
>
> nit: comment style.

I've fixed these and some other bits for the v3.
I've held off on pushing that until the rest of it seemed right.

> >> +static void *msc313_gpio_populate_parent_fwspec(struct gpio_chip *gc,
> >> +                                            unsigned int
> >> parent_hwirq,
> >> +                                            unsigned int parent_type)
> >> +{
> >> +       struct irq_fwspec *fwspec;
> >> +
> >> +       fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
> >> +       if (!fwspec)
> >> +               return NULL;
> >> +
> >> +       fwspec->fwnode = gc->irq.parent_domain->fwnode;
> >> +       fwspec->param_count = 3;
> >> +       fwspec->param[0] = GIC_SPI;
> >> +       fwspec->param[1] = parent_hwirq;
> >> +       fwspec->param[2] = parent_type;
> >> +
> >> +       return fwspec;
> >> +}
> >
> > Clever. Looping in Marc Z so he can say if this looks allright to him.
>
> Yup, this looks correct. However, looking at the bit of the patch that
> isn't quoted here, I see that msc313_gpio_irqchip doesn't have a
> .irq_set_affinity callback. Is this system UP only?

What is in mainline right now is UP only but there are chips with a
second cortex A7 that I have working in my tree.
So I will add that in for v3 if I can work out what I should actually
do there. :)

Thanks,

Daniel