linux-kernel - RE: [PATCH 1/2] ARM: imx: drop uneccessary of_platform_default

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Message-ID: <AM0PR04MB448101B88810300ABAFD8DE488470@AM0PR04MB4481.eurprd04.prod.outlook.com>
Date:   Mon, 18 Mar 2019 02:31:34 +0000
From:   Peng Fan <peng.fan@....com>
To:     Aisheng Dong <aisheng.dong@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "van.freenix@...il.com" <van.freenix@...il.com>
Subject: RE: [PATCH 1/2] ARM: imx: drop uneccessary
 of_platform_default_populate



> -----Original Message-----
> From: Aisheng Dong
> Sent: 2019年3月15日 21:39
> To: Peng Fan <peng.fan@....com>; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> dl-linux-imx <linux-imx@....com>; Anson Huang <anson.huang@....com>;
> arnd@...db.de; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org
> Cc: van.freenix@...il.com
> Subject: RE: [PATCH 1/2] ARM: imx: drop uneccessary
> of_platform_default_populate
> 
> [...]
> 
> > > Originally devices are registered in arch_initcall. Now it will be a
> > > bit later in arch_initcall_sync and this may cause a bit risk if the
> > > code under the default_populate want to access the device service
> > > provided
> > by early probe.
> > >
> > > Probably it's more safe to leave as it is unless you can double
> > > confirm there're no such code depends on accessing early probed
> > > devices as follows before we can make the change.
> >
> > This has been boot tested on 6Q-SDB/6UL-EVK/6SL-EVK board.
> > For i.MX, I only see pinctrl driver use arch_initcall from the link,
> > https://elixir.bootlin.com/linux/latest/ident/arch_initcall
> >
> > From my boot test, the pinctrl driver probe will be delayed a bit, but
> > I do not see issues.
> >
> 
> From what I saw, imx6q_1588_init() and imx6q_axi_init() will use syscon which
> is registered with postcore_initcall. Without having syscon devices populated,
> I wonder those calls may fall.
> Can you double check it?

I do not see failure in imx6q_1588_init by adding a return value check of
regmap_update_bits, But the imx6q_pm_init will find ocram device for
suspend usage, postpone the device population will make imx6q_pm_init
fail, so drop this patch and leave the code as it is.

Thanks,
Peng.

> 
> Regards
> Dong Aisheng