linux-kernel - Re: [PATCH 2/7] firmware: arm_scmi: imx: Support discovering buildinfo of MISC protocol

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Message-ID: <aGVOhMr7vg9Sl7Z2@bogus>
Date: Wed, 2 Jul 2025 16:21:40 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Peng Fan <peng.fan@....com>
Cc: Cristian Marussi <cristian.marussi@....com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Sudeep Holla <sudeep.holla@....com>,
	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 2/7] firmware: arm_scmi: imx: Support discovering
 buildinfo of MISC protocol

On Fri, Jun 27, 2025 at 02:03:45PM +0800, Peng Fan wrote:
> MISC protocol supports discovering the System Manager(SM) build
> information including build commit, build time and etc. 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    | 35 ++++++++++++++++++++++
>  include/linux/scmi_imx_protocol.h                  | 12 ++++++++
>  2 files changed, 47 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 a8915d3b4df518719d56bfff38922625ad9b70f6..1b24d070c6f4856b92f515fcdba5836fd6498ce6 100644
> --- a/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
> +++ b/drivers/firmware/arm_scmi/vendors/imx/imx-sm-misc.c
> @@ -25,6 +25,7 @@
>  enum scmi_imx_misc_protocol_cmd {
>  	SCMI_IMX_MISC_CTRL_SET	= 0x3,
>  	SCMI_IMX_MISC_CTRL_GET	= 0x4,
> +	SCMI_IMX_MISC_DISCOVER_BUILDINFO = 0x6,

I clearly missed to raise this point when the documentation for this command
was added. Anyways I assume, you had explored all the options before adding
this as generic tools may not be able to pick this up. Instead, I would have
just stuck with vendor version in the standard protocol with build number
embedded into it. The date and other info must be implicit from the build.

I try to be more cautious and ask questions in the future as I don't want
vendor extensions to be dumping ground for really random things like this.

-- 
Regards,
Sudeep