linux-kernel - Re: [PATCH 04/15] dt-bindings: rtc: sun6i-rtc: Export internal RC oscillator

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Date:   Wed, 28 Nov 2018 11:32:19 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 04/15] dt-bindings: rtc: sun6i-rtc: Export internal RC
 oscillator

On Wed, Nov 28, 2018 at 05:30:01PM +0800, Chen-Yu Tsai wrote:
> Experiments showed that on at least the H3/H5/A64 the RTC's internal
> oscillator also feeds the CPUS mux in the PRCM.
> 
> Export this clock through the device tree, instead of having to use
> a dummy fixed-clock device node, for the PRCM to consume. This will
> properly describe the relationship between the clocks.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  Documentation/devicetree/bindings/rtc/sun6i-rtc.txt | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/sun6i-rtc.txt b/Documentation/devicetree/bindings/rtc/sun6i-rtc.txt
> index 78c4fb472eb7..1bd37faadecb 100644
> --- a/Documentation/devicetree/bindings/rtc/sun6i-rtc.txt
> +++ b/Documentation/devicetree/bindings/rtc/sun6i-rtc.txt
> @@ -24,7 +24,7 @@ Required properties:
>  
>  Required properties for new device trees
>  - clocks	: phandle to the 32kHz external oscillator
> -- clock-output-names : names of the two clock outputs. See below.
> +- clock-output-names : names of the three clock outputs. See below.
>  - #clock-cells  : must be equal to 1.
>  
>  The RTC provides the following clocks at the given indices:
> @@ -32,6 +32,7 @@ The RTC provides the following clocks at the given indices:
>  - 1: LOSC external output, known as X32KFOUT in the datasheet.
>       This clock is not available on the A31 and is deprecated for old
>       device trees still using the "allwinner,sun6i-a31-rtc" compatible.
> +- 2: InternalOSC, or internal RC oscillator

It seems to be required only for a few RTC though (H3, H5 and R40?)

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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