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Date:   Fri, 23 Mar 2018 10:41:18 +0100
From:   Alexandre Belloni <alexandre.belloni@free-electrons.com>
To:     sean.wang@mediatek.com
Cc:     robh+dt@kernel.org, mark.rutland@arm.com, sre@kernel.org,
        lee.jones@linaro.org, a.zummo@towertech.it,
        eddie.huang@mediatek.com, devicetree@vger.kernel.org,
        linux-rtc@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 02/16] dt-bindings: rtc: mediatek: add bindings for
 PMIC RTC
Message-ID: <20180323094118.GC3417@piout.net>
References: <cover.1521794176.git.sean.wang@mediatek.com>
 <5846e8be319c4836808c8127d5bb51b7e999e896.1521794177.git.sean.wang@mediatek.com>
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In-Reply-To: <5846e8be319c4836808c8127d5bb51b7e999e896.1521794177.git.sean.wang@mediatek.com>
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Hi,

On 23/03/2018 at 17:14:59 +0800, sean.wang@mediatek.com wrote:
> From: Sean Wang <sean.wang@mediatek.com>
> 
> Add device-tree binding for MediaTek PMIC based RTC.
> 
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> ---
>  .../devicetree/bindings/rtc/rtc-mt6397.txt         | 39 ++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/rtc-mt6397.txt
> 
> diff --git a/Documentation/devicetree/bindings/rtc/rtc-mt6397.txt b/Documentation/devicetree/bindings/rtc/rtc-mt6397.txt
> new file mode 100644
> index 0000000..83ff6be
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/rtc-mt6397.txt
> @@ -0,0 +1,39 @@
> +Device-Tree bindings for MediaTek PMIC based RTC
> +
> +MediaTek PMIC based RTC is an independent function of MediaTek PMIC which
> +is working as a multi-function device (MFD). And the RTC can be configured and
> +set up via PMIC wrapper bus. Which is also common resource shared among the
> +other functions present on the PMIC.
> +
> +For MediaTek PMIC wrapper bus bindings, see:
> +Documentation/devicetree/bindings/soc/mediatek/pwrap.txt
> +
> +Required parent node:
> +- pmic
> +  For MediaTek PMIC MFD bindings, see:
> +  Documentation/devicetree/bindings/mfd/mt6397.txt
> +
> +Required properties:
> +- compatible: Should be one of follows
> +	"mediatek,mt6323-rtc": for MT6323 PMIC
> +	"mediatek,mt6397-rtc": for MT6397 PMIC
> +
> +Optional child node:
> +- power-off
> +  For Power-Off Device for MediaTek PMIC RTC bindings, see:
> +  Documentation/devicetree/bindings/power/reset/mt6397-rtc-poweroff.txt
> +
> +Example:
> +
> +	pmic {
> +		compatible = "mediatek,mt6323";
> +
> +		...
> +		rtc {
> +			compatible = "mediatek,mt6323-rtc";
> +
> +			power-off {
> +				compatible = "mediatek,mt6323-rtc-poweroff";
> +			};

I'm pretty sure the whole point of mfd is to avoid having the poweroff
controller under the rtc


-- 
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com