From: Lukas Wunner <lukas@wunner.de>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org, Mark Brown <broonie@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Ray Jui <rjui@broadcom.com>,
Scott Branden <sbranden@broadcom.com>,
"maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..."
<bcm-kernel-feedback-list@broadcom.com>,
"open list:SPI SUBSYSTEM" <linux-spi@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
<linux-rpi-kernel@lists.infradead.org>,
"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>,
Martin Sperl <kernel@martin.sperl.org>
Subject: Re: [PATCH v2] spi: bcm2835: Enable shared interrupt support
Date: Fri, 5 Jun 2020 12:51:00 +0200 [thread overview]
Message-ID: <20200605105100.kxe6wgh5itmhrgl2@wunner.de> (raw)
In-Reply-To: <20200604212819.715-1-f.fainelli@gmail.com>
On Thu, Jun 04, 2020 at 02:28:19PM -0700, Florian Fainelli wrote:
> The 4 SPI controller instances added in BCM2711 and BCM7211 SoCs (SPI3,
> SPI4, SPI5 and SPI6) share the same interrupt line with SPI0.
>
> For the BCM2835 case which is deemed performance critical, we would like
> to continue using an interrupt handler which does not have the extra
> comparison on BCM2835_SPI_CS_INTR.
>
> To support that requirement the common interrupt handling code between
> the shared and non-shared interrupt paths is split into a
> bcm2835_spi_interrupt_common() and both bcm2835_spi_interrupt() as well
> as bcm2835_spi_shared_interrupt() make use of it.
>
> During probe, we determine if there is at least another instance of this
> SPI controller, and if there is, then we install a shared interrupt
> handler.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
next prev parent reply other threads:[~2020-06-05 10:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-04 21:28 [PATCH v2] spi: bcm2835: Enable shared interrupt support Florian Fainelli
2020-06-05 8:46 ` Nicolas Saenz Julienne
2020-06-05 10:52 ` Mark Brown
2020-06-05 10:58 ` Nicolas Saenz Julienne
2020-06-05 10:51 ` Lukas Wunner [this message]
2020-06-05 11:14 ` Mark Brown
2020-06-05 12:20 ` Mark Brown
2020-06-05 11:34 ` Robin Murphy
2020-06-05 13:20 ` Mark Brown
2020-06-05 13:46 ` Robin Murphy
2020-06-05 14:41 ` Robin Murphy
2020-06-05 15:27 ` Mark Brown
2020-06-05 22:04 ` Florian Fainelli
2020-06-08 11:11 ` Robin Murphy
2020-06-08 11:28 ` Mark Brown
2020-06-15 16:34 ` Florian Fainelli
2020-06-15 17:00 ` Mark Brown
2020-06-15 17:04 ` Florian Fainelli
2020-06-15 17:30 ` Mark Brown
2020-06-15 17:31 ` Robin Murphy
2020-06-15 19:26 ` Mark Brown
2020-06-08 11:41 ` Lukas Wunner
2020-06-15 19:09 ` Robin Murphy
2020-06-15 19:42 ` Florian Fainelli
2020-06-15 20:48 ` Mark Brown
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