linux-kernel - RE: [EXT] Re: [PATCH V7 2/4] firmware: imx: enable imx scu general irq function

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Date:   Fri, 12 Apr 2019 02:32:54 +0000
From:   Anson Huang <anson.huang@....com>
To:     Aisheng Dong <aisheng.dong@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "sboyd@...nel.org" <sboyd@...nel.org>, Peng Fan <peng.fan@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [EXT] Re: [PATCH V7 2/4] firmware: imx: enable imx scu general
 irq function



Best Regards!
Anson Huang

> -----Original Message-----
> From: Aisheng Dong
> Sent: 2019年4月12日 10:26
> To: Anson Huang <anson.huang@....com>; Shawn Guo
> <shawnguo@...nel.org>; alexandre.belloni@...tlin.com
> Cc: robh+dt@...nel.org; mark.rutland@....com; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com; a.zummo@...ertech.it;
> alexandre.belloni@...tlin.com; ulf.hansson@...aro.org; sboyd@...nel.org;
> Peng Fan <peng.fan@....com>; Daniel Baluta <daniel.baluta@....com>;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-rtc@...r.kernel.org; dl-linux-imx <linux-
> imx@....com>
> Subject: RE: [EXT] Re: [PATCH V7 2/4] firmware: imx: enable imx scu general
> irq function
> 
> > From: Anson Huang
> > Sent: Friday, April 12, 2019 9:06 AM
> >
> > Hello, Alexandre
> > 	As i.MX SCU general irq function is picked up by Shawn, could you
> > please also pick up below i.MX SC RTC alarm support patch ?
> > 	https://patchwork.kernel.org/patch/10890525/
> >
> 
> No, it can't go through Alexandre's tree due to dependency issue.
> 
> Shawn,
> Do you think you can pick it up? Alexandre already gave the Ack.
> 
> AFAIK there's no other SCU RTC patches since v5.1-rc1 in Alexandre's tree.

Yes, need to make sure the dependency is handled, the RTC alarm patch MUST be picked up
ONLY when scu irq patch is ready, NOT sure how to handle this case for such scenario?

Anson.

> 
> Regards
> Dong Aisheng
> 
> > > On Tue, Apr 09, 2019 at 04:59:55AM +0000, Anson Huang wrote:
> > > > The System Controller Firmware (SCFW) controls RTC, thermal and
> > > > WDOG etc., these resources' interrupt function are managed by SCU.
> > > > When any IRQ pending, SCU will notify Linux via MU general
> > > > interrupt channel #3, and Linux kernel needs to call SCU APIs to
> > > > get IRQ status and notify each module to handle the interrupt.
> > > >
> > > > Since there is no data transmission for SCU IRQ notification, so
> > > > doorbell mode is used for this MU channel, and SCU driver will use
> > > > notifier mechanism to broadcast to every module which registers
> > > > the SCU block notifier.
> > > >
> > > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > > > Reviewed-by: Dong Aisheng <aisheng.dong@....com>
> > >
> > > Applied, thanks.