linux-kernel - Re: [RESEND PATCH v5 2/4] arm64: dts: rk3399: Add dfi and dmc nodes.

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Date:   Tue, 9 Mar 2021 12:42:40 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, heiko@...ech.de
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, Lin Huang <hl@...k-chips.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Gaël PORTAY <gael.portay@...labora.com>,
        Rob Herring <robh+dt@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jacob Chen <jacob2.chen@...k-chips.com>,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Robin Murphy <robin.murphy@....com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v5 2/4] arm64: dts: rk3399: Add dfi and dmc nodes.

Hi Daniel,

Some comments. Have a look if it's useful or that you disagree with.

New nodes should be verifiable if possible.
Especially with so many properties.
Could you convert rockchip-dfi.txt and rk3399_dmc.txt to yaml instead of
changing old txt documents?
Add rockchip-dfi.yaml and rk3399_dmc.yaml before this patch in version 6.

Nodes and properties have a sort order. Please fix.
Some goes for [RESEND PATCH v5 3/4].

(This is a generic dtsi. How about cooling and dmc ??)

----
Heiko rules:

compatible
reg
interrupts
[alphabetical]
status [if needed]

----
My incomplete list:

For nodes:
If exists on top: model, compatible and chosen.
Sort things without reg alphabetical first,
then sort the rest by reg address.

Inside nodes:
If exists on top: compatible, reg and interrupts.
In alphabetical order the required properties.
Then in alphabetical order the other properties.
And as last things that start with '#' in alphabetical order.
Add status below all other properties for soc internal components with
any board-specifics.
Keep an empty line between properties and nodes.

Exceptions:
Sort pinctrl-0 above pinctrl-names, so it stays in line with clock-names
and dma-names.
Sort simple-audio-card,name above other simple-audio-card properties.
Sort regulator-name above other regulator properties.
Sort regulator-min-microvolt above regulator-max-microvolt.

On 3/9/21 12:38 AM, Daniel Lezcano wrote:
> From: Lin Huang <hl@...k-chips.com>
> 
> These are required to support DDR DVFS on rk3399 platform.
> 
> Signed-off-by: Lin Huang <hl@...k-chips.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  arch/arm64/boot/dts/rockchip/rk3399.dtsi | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> index edbbf35fe19e..6f23d99236fe 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> @@ -1937,6 +1937,25 @@
>  		status = "disabled";
>  	};
>  
> +	dfi: dfi@...30000 {
> +		reg = <0x00 0xff630000 0x00 0x4000>;
> +		compatible = "rockchip,rk3399-dfi";
> +		rockchip,pmu = <&pmugrf>;
> +		interrupts = <GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH 0>;
> +		clocks = <&cru PCLK_DDR_MON>;
> +		clock-names = "pclk_ddr_mon";
> +		status = "disabled";
> +	};
> +
> +	dmc: dmc {
> +		compatible = "rockchip,rk3399-dmc";
> +		rockchip,pmu = <&pmugrf>;
> +		devfreq-events = <&dfi>;
> +		clocks = <&cru SCLK_DDRC>;
> +		clock-names = "dmc_clk";
> +		status = "disabled";
> +	};
> +
>  	pinctrl: pinctrl {
>  		compatible = "rockchip,rk3399-pinctrl";
>  		rockchip,grf = <&grf>;
>