linux-kernel - Re: [PATCH 3/7] firmware: arm_scmi: imx: Support getting cfg info of MISC protocol

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Message-ID: <20250704100741.GC4525@nxa18884-linux>
Date: Fri, 4 Jul 2025 18:07:41 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: Peng Fan <peng.fan@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, arm-scmi@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] firmware: arm_scmi: imx: Support getting cfg info of
 MISC protocol

On Wed, Jul 02, 2025 at 04:21:58PM +0100, Sudeep Holla wrote:
>On Fri, Jun 27, 2025 at 02:03:46PM +0800, Peng Fan wrote:
>> MISC protocol supports getting the System Manager(SM) mode selection
>> and configuration name. Add the API for user to retrieve the information
>> from SM.
>> 
>> Signed-off-by: Peng Fan <peng.fan@....com>
>> ---
>>  .../firmware/arm_scmi/vendors/imx/imx-sm-misc.c    | 30 ++++++++++++++++++++++
>>  include/linux/scmi_imx_protocol.h                  |  5 ++++
>>  2 files changed, 35 insertions(+)
>> 
>> diff --git a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
>> index 1b24d070c6f4856b92f515fcdba5836fd6498ce6..8ce4bf92e6535af2f30d72a34717678613b35049 100644
>> --- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
>> +++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
>> @@ -26,6 +26,7 @@ enum scmi_imx_misc_protocol_cmd {
>>  	SCMI_IMX_MISC_CTRL_SET	= 0x3,
>>  	SCMI_IMX_MISC_CTRL_GET	= 0x4,
>>  	SCMI_IMX_MISC_DISCOVER_BUILDINFO = 0x6,
>> +	SCMI_IMX_MISC_CFG_INFO = 0xC,
>>  	SCMI_IMX_MISC_CTRL_NOTIFY = 0x8,
>>  };
>>  
>> @@ -73,6 +74,11 @@ struct scmi_imx_misc_buildinfo_out {
>>  	u8 buildtime[MISC_MAX_BUILDTIME];
>>  };
>>  
>> +struct scmi_imx_misc_cfg_info_out {
>> +	__le32 msel;
>
>Now, I realise, this mode select is not properly defined in the document.
>Just 32-bit word. What are those values ? Any fixed list of values with
>well defined modes or configurations ? If so, please add to the document.

The current used value are 0,1,2. It is used to decide the logic machine
boot order, such as 0 means booting LM0, LM1, LM2, LM3...
Regarding 0,1,2 using which LM order, it could be defined by user in
i.MX9 System Manger cfg file. That means 1 could mean LM0, LM2, LM3, LM1
or LM0, LM3, LM1, LM2.

I will update doc with below:
msel is used to decide Logical Machine boot order, it could vary per board,
because the order is defined in System Manager board configuration file.

Regards,
Peng

>
>-- 
>Regards,
>Sudeep