linux-kernel - Re: [PATCH v2 1/5] arm64: dts: ti: k3-j7200: Change timer nodes status to reserved

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Message-ID: <8394ab04-5e5c-4e06-b1d1-7eb64bacedbe@ti.com>
Date: Wed, 14 Aug 2024 20:41:49 +0530
From: "Kumar, Udit" <u-kumar1@...com>
To: Beleswar Padhi <b-padhi@...com>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>
CC: <tony@...mide.com>, <g-vlaev@...com>, <afd@...com>, <hnagalla@...com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] arm64: dts: ti: k3-j7200: Change timer nodes
 status to reserved


On 8/14/2024 4:11 PM, Beleswar Padhi wrote:
> The remoteproc firmware like of R5F and DSPs in the MAIN voltage domain

There is no DSP on this SOC.

Please consider to re-word commit message


> use timers. Therefore, change the status of the timer nodes to
> "reserved" to avoid any clash. Usage is described as below:
>
> 	+===================+==========================+
> 	|  Remoteproc node  |        Timer Node        |
> 	+===================+==========================+
> 	| main_r5fss0_core0 | main_timer0, main_timer2 |
> 	+-------------------+--------------------------+
> 	| main_r5fss0_core1 | main_timer1              |
> 	+-------------------+--------------------------+


> This change is already incorporated for timer nodes in the MCU voltage
> domain.

For whole series,  on MCU domain R5 we have device-manager firmware,

which is needed to get SOC functional. So MCU domain timers are reserved.

So my suggestion will be to avoid above message


>
> Fixes: c8a28ed4837c ("arm64: dts: ti: k3-j7200: Add general purpose timers")
> Signed-off-by: Beleswar Padhi <b-padhi@...com>
> ---
>   .../boot/dts/ti/k3-j7200-common-proc-board.dts      | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> index 6593c5da82c0..a65066bd7f09 100644
> --- a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
> @@ -471,3 +471,16 @@ &main_mcan3 {
>   	pinctrl-0 = <&main_mcan3_pins_default>;
>   	phys = <&transceiver3>;
>   };
> +
> +/* Timers are used by Remoteproc firmware */
> +&main_timer0 {
> +	status = "reserved";
> +};
> +
> +&main_timer1 {
> +	status = "reserved";
> +};
> +
> +&main_timer2 {
> +	status = "reserved";
> +};