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

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Date:   Wed, 28 Aug 2019 16:32:00 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Leonard Crestez <leonard.crestez@....com>,
        Anson Huang <anson.huang@....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

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.

thanks,
rui

> 
> --
> Regards,
> Leonard