linux-kernel - Re: [PATCH v5 12/20] dt-bindings: rtc: sun6i: Add H616 compatible string

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Message-ID: <1675074.8rG671tKPg@kista>
Date:   Sun, 31 Jan 2021 14:44:40 +0100
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Andre Przywara <andre.przywara@....com>
Cc:     Samuel Holland <samuel@...lland.org>,
        Icenowy Zheng <icenowy@...c.io>, Rob Herring <robh@...nel.org>,
        Clément Péron <peron.clem@...il.com>,
        Shuosheng Huang <huangshuosheng@...winnertech.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        devicetree@...r.kernel.org, linux-rtc@...r.kernel.org
Subject: Re: [PATCH v5 12/20] dt-bindings: rtc: sun6i: Add H616 compatible string

Hi!

Dne sreda, 27. januar 2021 ob 18:24:52 CET je Andre Przywara napisal(a):
> Add the obvious compatible name to the existing RTC binding, and pair
> it with the existing H6 fallback compatible string, as the devices are
> compatible.

After close lookup I would disagree with this observation. Major difference is 
that H616 doesn't support usage of external 32768 Hz oscillator. It uses 24 
MHz oscillator with divider for that case. Due to that change, whole logic for 
external oscillator should go out. Additionally, this logic overwrites default 
value in LOSC_CTRL register, which is not nice (there is no documentation for 
those bits). 

Best regards,
Jernej

> 
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> Acked-by: Rob Herring <robh@...nel.org>
> ---
>  .../devicetree/bindings/rtc/allwinner,sun6i-a31-rtc.yaml       | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/allwinner,sun6i-a31-
rtc.yaml b/Documentation/devicetree/bindings/rtc/allwinner,sun6i-a31-rtc.yaml
> index b1b0ee769b71..4193e5813344 100644
> --- a/Documentation/devicetree/bindings/rtc/allwinner,sun6i-a31-rtc.yaml
> +++ b/Documentation/devicetree/bindings/rtc/allwinner,sun6i-a31-rtc.yaml
> @@ -26,6 +26,9 @@ properties:
>            - const: allwinner,sun50i-a64-rtc
>            - const: allwinner,sun8i-h3-rtc
>        - const: allwinner,sun50i-h6-rtc
> +      - items:
> +          - const: allwinner,sun50i-h616-rtc
> +          - const: allwinner,sun50i-h6-rtc
>  
>    reg:
>      maxItems: 1
> -- 
> 2.17.5
> 
>