linux-kernel - Re: [PATCH] spi: bcm2835: Enable shared interrupt support

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Message-ID: <bb82ab33-69b4-b407-ef1a-08f6326d5d93@gmail.com>
Date:   Thu, 28 May 2020 12:00:32 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Mark Brown <broonie@...nel.org>, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com
Cc:     Martin Sperl <kernel@...tin.sperl.org>, linux-spi@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: bcm2835: Enable shared interrupt support

On 5/28/20 11:58 AM, Nicolas Saenz Julienne wrote:
> From: Martin Sperl <kernel@...tin.sperl.org>
> 
> bcm2711, Rasberry Pi 4's SoC, shares one interrupt for multiple
> instances of the bcm2835 SPI controller. So this enables shared
> interrupt support for them.
> 
> The early bail out in the interrupt routine avoids messing with buffers
> of transfers being done by other means. Otherwise, the driver can handle
> receiving interrupts asserted by other controllers during an IRQ based
> transfer.
> 
> Signed-off-by: Martin Sperl <kernel@...tin.sperl.org>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

Thanks Nicolas, we have been using this patch on 7211 (which is very
similar to 2711):

Tested-by: Florian Fainelli <f.fainelli@...il.com>
Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian