linux-kernel - Re: [RFT PATCH v3 16/27] irqchip/apple-aic: Add support for the Apple Interrupt Controller

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Date:   Mon, 08 Mar 2021 11:50:13 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Hector Martin <marcan@...can.st>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Tony Lindgren <tony@...mide.com>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Alexander Graf <graf@...zon.com>,
        Will Deacon <will@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree <devicetree@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Documentation List <linux-doc@...r.kernel.org>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFT PATCH v3 16/27] irqchip/apple-aic: Add support for the Apple Interrupt Controller

On Fri, 05 Mar 2021 15:05:08 +0000,
Andy Shevchenko <andy.shevchenko@...il.com> wrote:

[...]

> > +#define TIMER_FIRING(x)                                                        \
> > +       (((x) & (ARCH_TIMER_CTRL_ENABLE | ARCH_TIMER_CTRL_IT_MASK |            \
> > +                ARCH_TIMER_CTRL_IT_STAT)) ==                                  \
> > +        (ARCH_TIMER_CTRL_ENABLE | ARCH_TIMER_CTRL_IT_STAT))
> 
> It's a bit hard to read. Perhaps
> 
> #define FOO_MASK  (_ENABLE | _STAT)
> #define _FIRING ... (FOO_MASK | _MASK == FOO_MASK)

The expression above is a direct translation of the architecture
reference manual, and I'd rather not have that hidden behind a bunch
of obscure macros.

[...]

> > +       irqc->hw_domain = irq_domain_create_linear(of_node_to_fwnode(node),
> > +                                                  irqc->nr_hw + AIC_NR_FIQ,
> > +                                                  &aic_irq_domain_ops, irqc);
> 
> If you are sure it will be always OF-only, why not to use
> irq_domain_add_linear()?

The OF-only API is deprecated, and there is no point in using it for
*new* code, specially when things like IPI allocation require the use
of the modern API. For arm64 root controllers, that's the way to go.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.