linux-kernel - Re: 0001-add-amlogic-gpio-to-irq

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Date:   Fri, 4 Dec 2020 10:13:40 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     林圣欢 <linshenghuan@...gtu-china.com>
Cc:     khilman <khilman@...libre.com>,
        narmstrong <narmstrong@...libre.com>,
        jbrunet <jbrunet@...libre.com>,
        "martin.blumenstingl" <martin.blumenstingl@...glemail.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic <linux-amlogic@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 0001-add-amlogic-gpio-to-irq

Hi Lisheng,

this patch got a bit mangled but I get where you're going.

I think Meson needs to be augmented to use hierarchical gpiolib irqchip
because this seems to be what the system is doing.

So start with drivers/pinctrl/meson/Kconfig and add:

select GPIOLIB_IRQCHIP
select IRQ_DOMAIN_HIEARARCHY

Then use the generic hierarchical gpiolib irqchip as described
in Documentation/driver-api/gpio/driver.rst
Type
git grep child_to_parent_hwirq
for several examples of how to do this.

Yours,
Linus Walleij