linux-kernel - Re: [PATCH V5 2/4] rtc: add i.MX system controller RTC support

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Message-ID: <20181221092447.GM2188@piout.net>
Date:   Fri, 21 Dec 2018 10:24:47 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Anson Huang <anson.huang@....com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        Aisheng Dong <aisheng.dong@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        Andy Gross <andy.gross@...aro.org>,
        "horms+renesas@...ge.net.au" <horms+renesas@...ge.net.au>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "arnd@...db.de" <arnd@...db.de>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "amit.kucheria@...aro.org" <amit.kucheria@...aro.org>,
        "ezequiel@...labora.com" <ezequiel@...labora.com>,
        "olof@...om.net" <olof@...om.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V5 2/4] rtc: add i.MX system controller RTC support

On 20/12/2018 08:56:16+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 secure rtc etc..
> 
> This patch adds i.MX system controller RTC driver support,
> Linux kernel has to communicate with system controller via MU
> (message unit) IPC to set/get RTC time and other alarm functions,
> since the RTC set time needs to be done in secure EL3 mode (required
> by system controller firmware) and alarm functions needs to be done
> with general MU IRQ handle, these depend on other components which
> are NOT ready, so this patch ONLY enables the RTC time read.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> ChangeLog since V4:
>     - Add dependency on IMX_SCU to avoid compile error when IMX_SCU is NOT enabled;
>     - Use dev_err instead of pr_err;
>     - Remove unneccssary different errors check in imx_scu_get_handle which is already done in API.
> ---
>  drivers/rtc/Kconfig      |  7 ++++
>  drivers/rtc/Makefile     |  1 +
>  drivers/rtc/rtc-imx-sc.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 99 insertions(+)
>  create mode 100644 drivers/rtc/rtc-imx-sc.c
> 
Applied, thanks.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com