Re: [RFC 1/4] ARM: imx: use device_initcall for imx_soc_device_init

From: Shawn Guo <shawnguo@kernel.org>
To: Peng Fan <peng.fan@nxp.com>
Cc: "linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	Jacky Bai <ping.bai@nxp.com>, Anson Huang <anson.huang@nxp.com>,
	"ard.biesheuvel@linaro.org" <ard.biesheuvel@linaro.org>,
	"info@metux.net" <info@metux.net>,
	"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	dl-linux-imx <linux-imx@nxp.com>,
	"kernel@pengutronix.de" <kernel@pengutronix.de>,
	"git@andred.net" <git@andred.net>,
	Leonard Crestez <leonard.crestez@nxp.com>,
	"festevam@gmail.com" <festevam@gmail.com>,
	"allison@lohutok.net" <allison@lohutok.net>,
	Abel Vesa <abel.vesa@nxp.com>
Subject: Re: [RFC 1/4] ARM: imx: use device_initcall for imx_soc_device_init
Date: Thu, 13 Feb 2020 13:55:33 +0800	[thread overview]
Message-ID: <20200213055532.GN11096@dragon> (raw)
In-Reply-To: <AM0PR04MB448134507B4F957C06F1315A881A0@AM0PR04MB4481.eurprd04.prod.outlook.com>

On Thu, Feb 13, 2020 at 05:47:41AM +0000, Peng Fan wrote:
> > Subject: Re: [RFC 1/4] ARM: imx: use device_initcall for imx_soc_device_init
> > 
> > On Fri, Jan 17, 2020 at 08:15:54AM +0000, Peng Fan wrote:
> > > > > Subject: [RFC 1/4] ARM: imx: use device_initcall for
> > > > > imx_soc_device_init
> > > > >
> > > > > From: Peng Fan <peng.fan@nxp.com>
> > > > >
> > > > > This is preparation to move imx_soc_device_init to
> > > > > drivers/soc/imx/
> > > > >
> > > > > There is no reason to must put dt devices under /sys/devices/soc0,
> > > > > they could also be under /sys/devices/platform, so we could pass
> > > > > NULL as parent when calling of_platform_default_populate.
> > > > >
> > > >
> > > > This change will impact various internal test case & userspace lib, I think.
> > > > Need to ask test team & other developer to double check the impact.
> > >
> > > /sys/devices/soc0 is still there, the patchset only moves the platform
> > > devices which under /sys/devices/soc0 to /sys/devices/platform
> > 
> > Jacky's concern still stands, as there are many user spaces which will be
> > broken and need update.
> 
> The soc device itself still under /sys/devices/soc0, the soc_id/revision still there.
> It is just the platform devices moved to /sys/devices/platform.
> 
> When I confirm with Jacky before, his concern is soc_id/revision will be
> moved. But this is not true, they are still there as before.
> 
> > 
> > > In this way, we aligned with ARM64. And simplify arch code by moving
> > > the code to drivers/soc/imx. In future, considering more cleanup, we
> > > could merge the code to soc-imx8.c, since they share similar silicon
> > > rev ocotp logic.
> > 
> > Though this is a good thing from maintenance point of view, we do not want
> > to break user spaces.
> 
> Actually not break user spaces, since this is RFC, I not expect this be merged.
> If you agree, I could post normal V1 patchset.

Okay.  You send formal patches, and we get them into linux-next to see
if people will complain any breakage.

Shawn

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