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

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Message-ID: <AM0PR04MB42114D5B25B23C0D7FFF95BA809C0@AM0PR04MB4211.eurprd04.prod.outlook.com>
Date:   Fri, 18 Jan 2019 09:46:37 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Marc Zyngier <marc.zyngier@....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

> 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?

Regards
Dong Aisheng

> Thanks,
> 
> 	M.
> --
> Jazz is not dead. It just smells funny...