linux-kernel - Re: [PATCH 1/4] dt-binding: irq: imx-irqsteer: use irq number per channel instead of group number

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Date:   Fri, 18 Jan 2019 10:12:22 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Aisheng Dong <aisheng.dong@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [PATCH 1/4] dt-binding: irq: imx-irqsteer: use irq number per
 channel instead of group number

On 18/01/2019 09:46, Aisheng Dong wrote:
>> From: Marc Zyngier [mailto:marc.zyngier@....com]
>> Sent: Friday, January 18, 2019 5:39 PM
>> On 18/01/2019 08:48, Lucas Stach wrote:
>>> Am Freitag, den 18.01.2019, 07:53 +0000 schrieb Aisheng Dong:
>>>> Not all 64 interrupts may be used in one group. e.g. most irqsteer in
>>>> imx8qxp and imx8qm subsystems supports only 32 interrupts.
>>>>
>>>> As the IP integration parameters are Channel number and interrupts
>>>> number, let's use fsl,irqs-per-chan to represents how many interrupts
>>>> supported by this irqsteer channel.
>>>
>>> Sorry, but total NACK. I've got to great lengths with dumping the
>>> actually implemented register layout on i.MX8M and AFAICS the IRQs are
>>> always managed in groups of 64 IRQs, even if less than that are
>>> connected as input IRQs. This is what the actually present register
>>> set on i.MX8M tells us.
>>
>> Also, I'd really like the DT bindings not to change at every release. So whatever
>> change (if any) has to be done for this driver to support existing HW, please
>> make sure that the DT bindings are kept as stable as possible.
>>
> 
> Sorry I should clarify it a bit.
> There's still no users in Devicetree.
> So I guess we can update it, right? Or not?

What do you mean by no users? This driver is in 5.0, and I assume people
are using it one way or another. Not having a platform in the kernel
tree is pretty much irrelevant, as the kernel tree is not a canonical
repository of existing platforms.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...