linux-kernel - Re: [PATCH 2/3] ARM: dts: bcm2711: Update SPI nodes compatible strings

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Message-ID: <903cf9fc-d493-583f-a3da-42f58cd7b474@gmail.com>
Date:   Thu, 4 Jun 2020 09:56:29 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        Lukas Wunner <lukas@...ner.de>
Cc:     "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <rjui@...adcom.com>, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        "open list:SPI SUBSYSTEM" <linux-spi@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        Martin Sperl <kernel@...tin.sperl.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: Re: [PATCH 2/3] ARM: dts: bcm2711: Update SPI nodes compatible
 strings



On 6/4/2020 9:54 AM, Stefan Wahren wrote:
> Am 04.06.20 um 18:40 schrieb Florian Fainelli:
>>
>> On 6/3/2020 9:20 PM, Lukas Wunner wrote:
>>> On Wed, Jun 03, 2020 at 08:46:54PM -0700, Florian Fainelli wrote:
>>>> The BCM2711 SoC features 5 SPI controllers which all share the same
>>>> interrupt line, the SPI driver needs to support interrupt sharing,
>>>> therefore use the chip specific compatible string to help with that.
>>> You're saying above that the 5 controllers all share the interrupt
>>> but below you're only changing the compatible string of 4 controllers.
>>>
>>> So I assume spi0 still has its own interrupt and only the additional
>>> 4 controllers present on the BCM2711/BCM7211 share their interrupt?
>> Correct, there are 5 instances, but only the 4 that were added for 2711
>> actually share the interrupt line, I will correct that in the next patch
>> version.
> 
> No, all 5 instances uses the same interrupt line. Please see my comment
> before.

OK, but this is not going to be needed, I have another solution that
does not involve device tree changes.
-- 
Florian