linux-kernel - Re: [PATCH 1/3] arm64: dts: actions: add s900 clock controller nodes

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Date:   Sat, 4 Nov 2017 15:20:37 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Andreas Färber <afaerber@...e.de>
Cc:     mturquette@...libre.com, sboyd@...eaurora.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, davem@...emloft.net,
        mchehab@...nel.org, rdunlap@...radead.org,
        daniel.thompson@...aro.org, amit.kucheria@...aro.org,
        liuwei@...ions-semi.com
Subject: Re: [PATCH 1/3] arm64: dts: actions: add s900 clock controller nodes

Hi Andreas,
On Sat, Nov 04, 2017 at 04:43:31PM +0800, Andreas Färber wrote:
> Am 01.11.2017 um 03:54 schrieb Manivannan Sadhasivam:
> > This patch adds clock controller nodes for Actions Semi s900 SoC
> 
> Please avoid "This patch". Once applied, it's a commit. :)
> 
Ack.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  arch/arm64/boot/dts/actions/s900.dtsi | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/actions/s900.dtsi b/arch/arm64/boot/dts/actions/s900.dtsi
> > index 11406f6..c099ef1 100644
> > --- a/arch/arm64/boot/dts/actions/s900.dtsi
> > +++ b/arch/arm64/boot/dts/actions/s900.dtsi
> > @@ -5,6 +5,7 @@
> >   */
> >  
> >  #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +#include <dt-bindings/clock/actions,s900-clock.h>
> 
> Alphabetical order please.
> 
Ack.
> >  
> >  / {
> >  	compatible = "actions,s900";
> > @@ -88,6 +89,24 @@
> >  		#clock-cells = <0>;
> >  	};
> >  
> > +	losc: losc {
> > +		compatible = "fixed-clock";
> > +		clock-frequency = <32768>;
> > +		#clock-cells = <0>;
> > +	};
> > +
> > +	diff_24M: diff_24M {
> 
> No underscore in node names please - maybe diff-24M or simpler diff24M?
> Please double-check that name - is it from manual or from schematics?
> 
Actually, this name comes from vendor driver and they have used "24M_diff".
As per DT conventions I renamed it to "diff_24M".

But I'm not clear about that clock. As I said in my reply to Rob's review
there isn't much documentation also. So, I guess we can name it as diff24M
for now.
> > +		compatible = "fixed-clock";
> > +		clock-frequency = <24000000>;
> > +		#clock-cells = <0>;
> > +	};
> > +
> > +	clock: clock-controller@...60000 {
> > +		compatible = "actions,s900-clock";
> > +		reg = <0 0xe0160000 0 0x1000>;
> > +		#clock-cells = <1>;
> > +	};
> 
> This node belongs into the soc node below, ordered by unit address.
> And maybe there's a better label than "clock"? "clkc" or some official
> name from the manual?
> 
Will use "cmu".

Thanks,
Mani
> > +
> >  	soc {
> >  		compatible = "simple-bus";
> >  		#address-cells = <2>;
> 
> Regards,
> Andreas
> 
> -- 
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