linux-kernel - RE: [PATCH V3 1/5] thermal: qoriq: Add clock operations

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Message-ID: <DB3PR0402MB3916C79F8FB5002ED76BB82FF5A30@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Wed, 28 Aug 2019 09:12:33 +0000
From:   Anson Huang <anson.huang@....com>
To:     Zhang Rui <rui.zhang@...el.com>,
        Leonard Crestez <leonard.crestez@....com>,
        Shawn Guo <shawnguo@...nel.org>
CC:     Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>
Subject: RE: [PATCH V3 1/5] thermal: qoriq: Add clock operations

Hi, Rui

> On Wed, 2019-08-28 at 08:49 +0000, Anson Huang wrote:
> > Hi, Rui
> >
> > > On Wed, 2019-08-28 at 16:32 +0800, Zhang Rui wrote:
> > > > On Tue, 2019-08-27 at 12:41 +0000, Leonard Crestez wrote:
> > > > > On 27.08.2019 04:51, Anson Huang wrote:
> > > > > > > In an earlier series the CLK_IS_CRITICAL flags was removed
> > > > > > > from the TMU clock so if the thermal driver doesn't
> > > > > > > explicitly enable it the system will hang on probe. This is
> > > > > > > what happens in linux-next right now!
> > > > > >
> > > > > > The thermal driver should be built with module, so default
> > > > > > kernel should can boot up, do you modify the thermal driver as
> > > > > > built-in?
> > > > > >
> > > > > > > Unless this patches is merged soon we'll end up with a 5.4-
> > > > > > > rc1
> > > > > > > that doesn't boot on imx8mq. An easy fix would be to
> > > > > > > drop/revert commit
> > > > > > > 951c1aef9691 ("clk: imx8mq: Remove CLK_IS_CRITICAL flag for
> > > > > > > IMX8MQ_CLK_TMU_ROOT") until the thermal patches are
> > > > > > > accepted.
> > > > > >
> > > > > > If the thermal driver is built as module, I think no need to
> > > > > > revert the commit, but if by default thermal driver is built-
> > > > > > in or mod probed, then yes, it should NOT break kernel boot
> > > > > > up.
> > > > >
> > > > > The qoriq_thermal driver is built as a module in defconfig and
> > > > > when modules are properly installed in rootfs they will be
> > > > > automatically be probed on boot and cause a hang.
> > > > >
> > > > > I usually run nfsroot with modules:
> > > > >
> > > > >      make modules_install INSTALL_MOD_PATH=/srv/nfs/imx8-root
> > > >
> > > > so we need this patch shipped in the beginning of the merge
> > > > window, right?
> > > > if there is hard dependency between patches, it's better to send
> > > > them in one series, and get shipped via either tree.
> > > >
> > > > BTW, who is maintaining qoriq driver from NXP? If Anson is
> > > > maintaining and developing this driver, it's better to update this
> > > > in the driver or the MAINTAINER file, I will take the driver
> > > > specific patches as long as we have ACK/Reviewed-By from the
> > > > driver maintainer.
> >
> > I am NOT sure who is the qoriq driver from NXP, some of our i.MX SoCs
> > use qoriq thermal IP, so I have to add support for them.  The first
> > maintainer for this driver is hongtao.jia@....com, but I can NOT find
> > it from NXP's mail system, NOT sure if he is still in NXP. The
> > MAINTAINER file does NOT have info for this Driver's maintainer, so
> > how to update it? Just change the name in driver? Or leave it as what
> > it is?
> >
> >  MODULE_AUTHOR("Jia Hongtao <hongtao.jia@....com>");
> > MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
> > MODULE_LICENSE("GPL v2");
> >
> I see several people are actively working on this driver from NXP.
> If you're okay, I'd like to get your comments on all the patches for this driver
> before I take them, and I can update the MAINTAINER file later so that you're
> CCed for all the qoriq thermal driver changes.

I am OK, but it may take me some days to do it, I will make it ASAP, thanks.

Anson

> 
> > >
> > > And also, can you provide your feedback for this one?
> > >
> https://patch
> > >
> work.kernel.org%2Fpatch%2F10974147%2F&amp;data=02%7C01%7Canson.h
> > >
> uang%40nxp.com%7C887e7c90f7c943ff0d9b08d72b92aea1%7C686ea1d3bc2
> > >
> b4c6fa92cd99c5c301635%7C0%7C0%7C637025781325203384&amp;sdata=Xg
> > >
> tX6mPdA50Nbb%2FmnS2om2bJNepTd1th6HmfwGuU9Hw%3D&amp;reserve
> > > d=0
> >
> > I can take a look at it later.
> >
> thanks!
> 
> -rui
> > Thanks,
> > Anson