linux-kernel - Re: [PATCH 3/3] arm64: dts: rockchip: Add rk3588 timer

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Date:   Tue, 18 Apr 2023 16:12:01 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Johan Jonker <jbx6244@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Sugar Zhang <sugar.zhang@...k-chips.com>,
        Shreeya Patel <shreeya.patel@...labora.com>,
        Kever Yang <kever.yang@...k-chips.com>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 3/3] arm64: dts: rockchip: Add rk3588 timer

Am Dienstag, 18. April 2023, 13:53:23 CEST schrieb Cristian Ciocaltea:
> 
> On 4/18/23 14:29, Johan Jonker wrote:
> > 
> > 
> > On 4/18/23 11:53, Cristian Ciocaltea wrote:
> >> Add DT node for Rockchip RK3588/RK3588S SoC timer.
> >>
> >> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> >> ---
> >>  arch/arm64/boot/dts/rockchip/rk3588s.dtsi | 8 ++++++++
> >>  1 file changed, 8 insertions(+)
> >>
> >> diff --git a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi b/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
> >> index 657c019d27fa..acd89a55374a 100644
> >> --- a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
> >> +++ b/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
> >> @@ -1400,6 +1400,14 @@ i2c5: i2c@...d0000 {
> >>  		status = "disabled";
> >>  	};
> >>  
> > 
> >> +	rktimer: timer@...e0000 {
> > 
> > There are multiple timers.
> > Use a label in line with the TRM.
> > Maybe change your label to "timer0" in that trend?
> 
> Sure, will use "timer0".
> 
> >> +		compatible = "rockchip,rk3588-timer", "rockchip,rk3288-timer";
> >> +		reg = <0x0 0xfeae0000 0x0 0x20>;
> > 
> >> +		clocks = <&cru PCLK_BUSTIMER0>, <&cru CLK_BUSTIMER0>;
> >> +		clock-names = "pclk", "timer";
> >> +		interrupts = <GIC_SPI 289 IRQ_TYPE_LEVEL_HIGH 0>;
> > 
> > Heiko's sort rules:
> > 
> > compatible
> > reg
> > interrupts
> > [alphabetical]
> > status [if needed]
> 
> Thanks for pointing this out! The sort rule was not obvious as there are
> many other nodes that don't conform.

hmm, that is probably an oversight then :-) . Though looking through
rk3588s.dtsi and rk3588.dtsi, it looks like most peripherals follow that
sorting quite nicely.

But there is also a bit of leeway ... aka there can be an argument made
that assigned-clocks might want to live near clocks or regulator-properties
could be sorted somewhat differently.

So general ideal is alphabetically for the random properties to give some
guidance on sorting.

And compatible, regs, interrupts at the top + status at the bottom makes
it way easier to establish a reading pattern, when looking for something
in the file :-) .


Heiko