linux-kernel - Re: [PATCH v4 5/7] arm64: dts: ti: k3-j784s4-mcu: Add the main domain watchdog instances

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Message-ID: <20230925131927.f7ff2u2ip3jxejyg@dreadful>
Date:   Mon, 25 Sep 2023 08:19:27 -0500
From:   Nishanth Menon <nm@...com>
To:     Keerthy <j-keerthy@...com>
CC:     <robh+dt@...nel.org>, <vigneshr@...com>, <conor+dt@...nel.org>,
        <kristo@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <u-kumar1@...com>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 5/7] arm64: dts: ti: k3-j784s4-mcu: Add the main
 domain watchdog instances

On 13:43-20230925, Keerthy wrote:
> There are totally 2 instances of watchdog module in MCU domain.
> 
> Signed-off-by: Keerthy <j-keerthy@...com>
> ---
>  .../boot/dts/ti/k3-j784s4-mcu-wakeup.dtsi     | 20 +++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-mcu-wakeup.dtsi
> index a7b5c4cb7d3e..0b7cc277a567 100644
> --- a/arch/arm64/boot/dts/ti/k3-j784s4-mcu-wakeup.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-mcu-wakeup.dtsi
> @@ -714,4 +714,24 @@
>  		ti,esm-pins = <63>;
>  		bootph-pre-ram;
>  	};
> +
> +	mcu_watchdog0: watchdog@...00000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x40600000 0x00 0x100>;
> +		clocks = <&k3_clks 367 1>;
> +		power-domains = <&k3_pds 367 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 367 0>;
> +		assigned-clock-parents = <&k3_clks 367 4>;
> +		status = "disabled";
> +	};
> +
> +	mcu_watchdog1: watchdog@...10000 {
> +		compatible = "ti,j7-rti-wdt";
> +		reg = <0x00 0x40610000 0x00 0x100>;
> +		clocks = <&k3_clks 368 1>;
> +		power-domains = <&k3_pds 368 TI_SCI_PD_EXCLUSIVE>;
> +		assigned-clocks = <&k3_clks 368 0>;
> +		assigned-clock-parents = <&k3_clks 368 4>;
> +		status = "disabled";

Explain in commit message as to why these are disabled. I believe it is
because this RTI instances are tightly coupled to the micro
controllers. but that information needs to be documented.
> +	};
>  };
> -- 
> 2.17.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D