linux-kernel - Re: [PATCH 1/2] soc: imx-sc: add i.MX system controller soc driver support

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Message-ID: <20190421073958.GC19962@dragon>
Date:   Sun, 21 Apr 2019 15:40:00 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Anson Huang <anson.huang@....com>
Cc:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "horms+renesas@...ge.net.au" <horms+renesas@...ge.net.au>,
        "olof@...om.net" <olof@...om.net>,
        Andy Gross <andy.gross@...aro.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "jagan@...rulasolutions.com" <jagan@...rulasolutions.com>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "stefan.wahren@...e.com" <stefan.wahren@...e.com>,
        "ezequiel@...labora.com" <ezequiel@...labora.com>,
        "marc.w.gonzalez@...e.fr" <marc.w.gonzalez@...e.fr>,
        "robh@...nel.org" <robh@...nel.org>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        Abel Vesa <abel.vesa@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 1/2] soc: imx-sc: add i.MX system controller soc driver
 support

On Thu, Apr 11, 2019 at 06:49:12AM +0000, Anson Huang wrote:
> i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
> inside, the system controller is in charge of controlling power,
> clock and fuse etc..
> 
> This patch adds i.MX system controller soc driver support,
> Linux kernel has to communicate with system controller via MU
> (message unit) IPC to get soc revision, uid etc..
> 
> With this patch, soc info can be read from sysfs:
> 
> i.mx8qxp-mek# cat /sys/devices/soc0/family
> Freescale i.MX
> 
> i.mx8qxp-mek# cat /sys/devices/soc0/soc_id
> i.MX8QXP
> 
> i.mx8qxp-mek# cat /sys/devices/soc0/machine
> Freescale i.MX8QXP MEK
> 
> i.mx8qxp-mek# cat /sys/devices/soc0/revision
> 1.1
> 
> i.mx8qxp-mek# cat /sys/devices/soc0/soc_uid
> 7B64280B57AC1898
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/soc/imx/Kconfig      |   7 ++
>  drivers/soc/imx/Makefile     |   1 +
>  drivers/soc/imx/soc-imx-sc.c | 220 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 228 insertions(+)
>  create mode 100644 drivers/soc/imx/soc-imx-sc.c

Rather than creating a new driver, please take a look at Abel's generic
i.MX8 SoC driver, and see if it can be extended to cover i.MX8QXP.

Shawn