linux-kernel - Re: [PATCH v3 5/5] arm64: dts: ti: k3-j722s: Change timer nodes status to reserved

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Message-ID: <7926115d-6111-4ea4-af04-3cc51c89c5f8@ti.com>
Date: Mon, 26 Aug 2024 16:21:09 +0530
From: Beleswar Prasad Padhi <b-padhi@...com>
To: "Kumar, Udit" <u-kumar1@...com>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>
CC: <tony@...mide.com>, <bb@...com>, <d-gole@...com>, <afd@...com>,
        <hnagalla@...com>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] arm64: dts: ti: k3-j722s: Change timer nodes
 status to reserved


On 26/08/24 10:30, Kumar, Udit wrote:
>
> On 8/16/2024 1:09 PM, Beleswar Padhi wrote:
>> The remoteproc firmware like of R5F and DSPs in the MAIN voltage domain
>> 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 |
>>     +-------------------+-------------+
>>     | c7x_0             | main_timer1 |
>>     +-------------------+-------------+
>>     | c7x_1             | main_timer2 |
>>     +-------------------+-------------+
>>
>> Fixes: 29075cc09f43 ("arm64: dts: ti: Introduce AM62P5 family of SoCs")
>> Signed-off-by: Beleswar Padhi <b-padhi@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 13 +++++++++++++
>>   1 file changed, 13 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts 
>> b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
>> index dd3b5f7039d7..e03beb0b5aad 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
>> @@ -566,3 +566,16 @@ &mcasp1 {
>>              0 0 0 0
>>       >;
>>   };
>> +
>> +/* Timers are used by Remoteproc firmware */
>> +&main_timer0 {
>> +    status = "reserved";
>> +};
>> +
>> +&main_timer1 {
>> +    status = "reserved";
>> +};
>> +
>> +&main_timer2 {
>> +    status = "reserved";
>> +};
>
>
> Since IPC is not up-streamed for J722S , So I suggest to drop this 
> patch from this series
Thanks for catching this! I have dropped this patch in v4 revision of 
this series.
>
> and include this when you upstream IPC support for J722S board .
>
>