linux-kernel - Re: [PATCH 11/25] ARM: dts: s5pv210: add RTC 32 KHz clock in Aries family

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Date:   Tue, 8 Sep 2020 08:54:59 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jonathan Bakker <xc-racer2@...e.ca>
Cc:     Kukjin Kim <kgene@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH 11/25] ARM: dts: s5pv210: add RTC 32 KHz clock in Aries
 family

On Mon, Sep 07, 2020 at 04:57:53PM -0700, Jonathan Bakker wrote:
> Hi Krzysztof,
> 
> On 2020-09-07 9:11 a.m., Krzysztof Kozlowski wrote:
> > The S3C RTC requires 32768 Hz clock as input which is provided by PMIC.
> > However there is no such clock provider but rather a regulator driver
> > which registers the clock as a regulator.  This is an old driver which
> > will not be updated so add a workaround - a fixed-clock to fill missing
> > clock phandle reference in S3C RTC.
> > 
> > This fixes dtbs_check warnings:
> > 
> >   rtc@...00000: clocks: [[2, 145]] is too short
> >   rtc@...00000: clock-names: ['rtc'] is too short
> > 
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> > ---
> >  arch/arm/boot/dts/s5pv210-aries.dtsi | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/s5pv210-aries.dtsi b/arch/arm/boot/dts/s5pv210-aries.dtsi
> > index 6ba23562da46..86c3b26fd21e 100644
> > --- a/arch/arm/boot/dts/s5pv210-aries.dtsi
> > +++ b/arch/arm/boot/dts/s5pv210-aries.dtsi
> > @@ -47,6 +47,13 @@
> >  		};
> >  	};
> >  
> > +	pmic_ap_clk: clock-0 {
> > +		/* Workaround for missing clock on PMIC */
> > +		compatible = "fixed-clock";
> > +		#clock-cells = <0>;
> > +		clock-frequency = <32768>;
> > +	};
> > +
> >  	bt_codec: bt_sco {
> >  		compatible = "linux,bt-sco";
> >  		#sound-dai-cells = <0>;
> > @@ -825,6 +832,11 @@
> >  	samsung,pwm-outputs = <1>;
> >  };
> >  
> > +&rtc {
> > +	clocks = <&clocks CLK_RTC>, <&pmic_ap_clk>;
> > +	clock-names = "rtc", "rtc_src";
> 
> Missing a
> 
> status = "okay";
> 
> here, but with that it works fine for me.  Looks like it's also
> missing in the patches for the other devices as well.

It wasn't there on purpose - I did not want to enable the RTC, just fix
the DTS with the dtschema. However a separate patch could be to actually
enable it.

I'll add your tested-by to this patch.

Best regards,
Krzysztof