linux-kernel - Re: [PATCH v2 6/7] gpio: brcmstb: consolidate interrupt domains

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Date:   Thu, 26 Oct 2017 16:44:59 -0700
From:   Gregory Fong <gregory.0xf0@...il.com>
To:     Doug Berger <opendmb@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Brian Norris <computersforpeace@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        linux-gpio@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 6/7] gpio: brcmstb: consolidate interrupt domains

On Tue, Oct 24, 2017 at 12:54 PM, Doug Berger <opendmb@...il.com> wrote:
> The GPIOLIB IRQ chip helpers were very appealing, but badly broke
> the 1:1 mapping between a GPIO controller's device_node and its
> interrupt domain.
>
> When another device-tree node references a GPIO device as its
> interrupt parent, the irq_create_of_mapping() function looks for
> the irq domain of the GPIO device and since all bank irq domains
> reference the same GPIO device node it always resolves to the irq
> domain of the first bank regardless of which bank the number of
> the GPIO should resolve. This domain can only map hwirq numbers
> 0-31 so interrupts on GPIO above that can't be mapped by the
> device-tree.
>
> This commit effectively reverts the patch from Gregory Fong [1]
> that was accepted upstream and replaces it with a consolidated
> irq domain implementation with one larger interrupt domain per
> GPIO controller instance spanning multiple GPIO banks based on
> an earlier patch [2] also submitted by Gregory Fong.
>
> [1] https://patchwork.kernel.org/patch/6921561/
> [2] https://patchwork.kernel.org/patch/6347811/
>
> Fixes: 19a7b6940b78 ("gpio: brcmstb: Add interrupt and wakeup source support")
> Signed-off-by: Doug Berger <opendmb@...il.com>

Reviewed-by: Gregory Fong <gregory.0xf0@...il.com>