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From: Dmitry Torokhov <dtor@chromium.org>
To: egranata@chromium.org
Cc: Hans de Goede <hdegoede@redhat.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	andy.shevchenko@gmail.com,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	enric.balletbo@collabora.com, lkml <linux-kernel@vger.kernel.org>,
	gwendal@chromium.org,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	briannorris@chromium.org, andriy.shevchenko@linux.intel.com,
	Enrico Granata <egranata@google.com>
Subject: Re: [PATCH v2] driver: platform: Support parsing GpioInt 0 in platform_get_irq()
Date: Mon, 11 Feb 2019 11:25:54 -0800
Message-ID: <CAE_wzQ-a7GR3Kw4cDdD8g8eboKaDtG5zbmtdY+D3K=nh94tUqQ@mail.gmail.com> (raw)
In-Reply-To: <20190211190112.209286-1-egranata@chromium.org>

On Mon, Feb 11, 2019 at 11:01 AM <egranata@chromium.org> wrote:
>
> From: Enrico Granata <egranata@chromium.org>
>
> ACPI 5 added support for GpioInt resources as a way to provide
> information about interrupts mediated via a GPIO controller.
>
> Several device buses (e.g. SPI, I2C) have support for retrieving
> an IRQ specified via this type of resource, and providing it
> directly to the driver as an IRQ number.
>
> This is not currently done for the platform drivers, as platform_get_irq()
> does not try to parse GpioInt() resources. This requires drivers to
> either have to support only one possible IRQ resource, or to have code
> in place to try both as a failsafe.
>
> While there is a possibility of ambiguity for devices that exposes
> multiple IRQs, it is easy and feasible to support the common case
> of devices that only expose one IRQ which would be of either type
> depending on the underlying system's architecture.
>
> This commit adds support for parsing a GpioInt resource in order
> to fulfill a request for the index 0 IRQ for a platform device.
>
> Signed-off-by: Enrico Granata <egranata@chromium.org>

Yeah, this looks good to me.

Reviewed-by: Dmitry Torokhov <dtor@chromium.org>

> ---
> Changes in v2:
>  - only support IRQ index 0
>
>  drivers/base/platform.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 1c958eb33ef4d..0d3611cd1b3bc 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -127,7 +127,20 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
>                 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
>         }
>
> -       return r ? r->start : -ENXIO;
> +       if (r)
> +               return r->start;
> +
> +       /*
> +        * For the index 0 interrupt, allow falling back to GpioInt
> +        * resources. While a device could have both Interrupt and GpioInt
> +        * resources, making this fallback ambiguous, in many common cases
> +        * the device will only expose one IRQ, and this fallback
> +        * allows a common code path across either kind of resource.
> +        */
> +       if (num == 0 && has_acpi_companion(&dev->dev))
> +               return acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num);
> +
> +       return -ENXIO;
>  #endif
>  }
>  EXPORT_SYMBOL_GPL(platform_get_irq);
> --
> 2.20.1.791.gb4d0f1c61a-goog
>

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-07 18:59 [PATCH] driver: platform: Add support for GpioInt() ACPI to platform_get_irq() egranata
2019-02-07 19:02 ` Rafael J. Wysocki
2019-02-07 19:39   ` Andy Shevchenko
2019-02-07 19:45     ` Andy Shevchenko
2019-02-07 19:55     ` Enrico Granata
     [not found]     ` <CAPR809vnpuh8nOjU3QMCh6YJUKmtX92+bnHSUKGiAXAp6NwCHQ@mail.gmail.com>
2019-02-07 20:18       ` Andy Shevchenko
2019-02-07 20:29         ` Dmitry Torokhov
2019-02-11 10:30           ` Mika Westerberg
2019-02-11 15:42             ` Hans de Goede
2019-02-11 19:01 ` [PATCH v2] driver: platform: Support parsing GpioInt 0 in platform_get_irq() egranata
2019-02-11 19:25   ` Dmitry Torokhov [this message]
2019-02-12  7:29   ` Hans de Goede
2019-02-12  9:08   ` Mika Westerberg
2019-02-12  9:18   ` Rafael J. Wysocki
2019-02-12 12:46   ` Andy Shevchenko
2019-02-20 18:05   ` Brian Norris
2019-02-21 18:58     ` Enrico Granata
2019-02-21 19:34     ` [PATCH v3] " egranata
2019-02-22  9:03       ` Rafael J. Wysocki
2019-02-22 17:06         ` Brian Norris
2019-02-24 19:34   ` [PATCH v2] " Rafael J. Wysocki

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