linux-kernel - Re: [PATCH v4 4/7] arm64: dts: ti: k3-j784s4-main: Add the main domain watchdog instances

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Date:   Mon, 25 Sep 2023 10:40:10 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Keerthy <j-keerthy@...com>, robh+dt@...nel.org, nm@...com,
        vigneshr@...com, conor+dt@...nel.org, kristo@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     u-kumar1@...com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/7] arm64: dts: ti: k3-j784s4-main: Add the main
 domain watchdog instances

On 25/09/2023 10:13, Keerthy wrote:
> There are totally 19 instances of watchdog module. One each for the
> 8 A72 cores, one each for the 4 C7x cores, 1 for the GPU, 1 each
> for the 6 R5F cores in the main domain. Keeping only the A72 instances
> enabled and disabling the rest by default.
> 
> Signed-off-by: Keerthy <j-keerthy@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi | 182 +++++++++++++++++++++
>  1 file changed, 182 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> index 26dc3776f911..8c3efe066803 100644
> --- a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> @@ -1576,4 +1576,186 @@
>  			      <695>;
>  		bootph-pre-ram;
>  	};
> +
> +	watchdog0: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2200000 0x00 0x100>;
> +		clocks = <&k3_clks 348 1>;
> +		power-domains = <&k3_pds 348 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 348 0>;
> +		assigned-clock-parents = <&k3_clks 348 4>;
> +	};
> +
> +	watchdog1: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2210000 0x00 0x100>;
> +		clocks = <&k3_clks 349 1>;
> +		power-domains = <&k3_pds 349 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 349 0>;
> +		assigned-clock-parents = <&k3_clks 349 4>;
> +	};
> +
> +	watchdog2: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2220000 0x00 0x100>;
> +		clocks = <&k3_clks 350 1>;
> +		power-domains = <&k3_pds 350 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 350 0>;
> +		assigned-clock-parents = <&k3_clks 350 4>;
> +	};
> +
> +	watchdog3: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2230000 0x00 0x100>;
> +		clocks = <&k3_clks 351 1>;
> +		power-domains = <&k3_pds 351 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 351 0>;
> +		assigned-clock-parents = <&k3_clks 351 4>;
> +	};
> +
> +	watchdog4: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2240000 0x00 0x100>;
> +		clocks = <&k3_clks 352 1>;
> +		power-domains = <&k3_pds 352 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 352 0>;
> +		assigned-clock-parents = <&k3_clks 352 4>;
> +	};
> +
> +	watchdog5: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2250000 0x00 0x100>;
> +		clocks = <&k3_clks 353 1>;
> +		power-domains = <&k3_pds 353 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 353 0>;
> +		assigned-clock-parents = <&k3_clks 353 4>;
> +	};
> +
> +	watchdog6: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2260000 0x00 0x100>;
> +		clocks = <&k3_clks 354 1>;
> +		power-domains = <&k3_pds 354 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 354 0>;
> +		assigned-clock-parents = <&k3_clks 354 4>;
> +	};
> +
> +	watchdog7: watchdog@...0000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x2270000 0x00 0x100>;
> +		clocks = <&k3_clks 355 1>;
> +		power-domains = <&k3_pds 355 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 355 0>;
> +		assigned-clock-parents = <&k3_clks 355 4>;
> +	};
> +
> +	watchdog16: watchdog@...0000 {
> +		status = "disabled";

status is never first property. It is actually always last in node
definition.

> +		compatible = "ti,j7-rti-wdt";

OTOH, compatible is always the first property. Always. There is no
coding style which suggests different order.

Best regards,
Krzysztof