linux-kernel - RE: [PATCH v6] gpio: dwapb: Add support for 1 interrupt per port A GPIO

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Date:   Wed, 23 May 2018 08:45:57 +0000
From:   Phil Edworthy <phil.edworthy@...esas.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Hoan Tran <hotran@....com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        "Lee Jones" <lee.jones@...aro.org>,
        Michel Pollet <michel.pollet@...renesas.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6] gpio: dwapb: Add support for 1 interrupt per port A
 GPIO

Hi Linus,

On 23 May 2018 09:29, Linus Walleij wrote:
> On Fri, May 11, 2018 at 10:31 AM, Phil Edworthy wrote:
> 
> > The DesignWare GPIO IP can be configured for either 1 interrupt or 1
> > per GPIO in port A, but the driver currently only supports 1 interrupt.
> > See the DesignWare DW_apb_gpio Databook description of the
> > 'GPIO_INTR_IO' parameter.
> >
> > This change allows the driver to work with up to 32 interrupts, it
> > will get as many interrupts as specified in the DT 'interrupts' property.
> > It doesn't do anything clever with the different interrupts, it just
> > calls the same handler used for single interrupt hardware.
> >
> > Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
> > Reviewed-by: Rob Herring <robh@...nel.org>
> > Acked-by: Lee Jones <lee.jones@...aro.org>
> > ---
> > One point to mention is that I have made it possible for users to have
> > unconnected interrupts by specifying holes in the list of interrupts.
> > This is done by supporting the interrupts-extended DT prop.
> > However, I have no use for this and had to hack some test case for this.
> > Perhaps the driver should support 1 interrupt or all GPIOa as interrupts?
> >
> > v6:
> >  - Treat DT and ACPI the same as much as possible. Note that we can't use
> >    platform_get_irq() to get the DT interrupts as they are in the port
> >    sub-node and hence do not have an associated platform device.
> 
> I already applied this patch in some version, can you check what is in my
> devel branch and send incremental patches on top if something needs
> changing?
> https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-
> gpio.git/commit/?h=devel&id=e6ca26abd37606ba4864f20c85d3fe4a2173b93f
> 
> Sorry for not knowing by heart what was applied or when, it's just too much
> for me sometimes.
No problem, I'll send a patch with the incremental changes.

Thanks
Phil