linux-kernel - Re: [PATCH v2 1/4] firmware: arm_scmi: Bypass setting fwnode for scmi cpufreq

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Message-ID: <20250206105218.GA22527@localhost.localdomain>
Date: Thu, 6 Feb 2025 18:52:20 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Saravana Kannan <saravanak@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dong Aisheng <aisheng.dong@....com>,
	Fabio Estevam <festevam@...il.com>, Shawn Guo <shawnguo@...nel.org>,
	Jacky Bai <ping.bai@....com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Sascha Hauer <s.hauer@...gutronix.de>, arm-scmi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, imx@...ts.linux.dev,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v2 1/4] firmware: arm_scmi: Bypass setting fwnode for
 scmi cpufreq

On Wed, Feb 05, 2025 at 03:45:00PM +0300, Dan Carpenter wrote:
>On Mon, Jan 20, 2025 at 03:13:29PM +0800, Peng Fan (OSS) wrote:
>> diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
>> index 2c853c84b58f530898057e4ab274ba76070de05e..7850eb7710f499888d32aebf5d99df63db8bfa26 100644
>> --- a/drivers/firmware/arm_scmi/bus.c
>> +++ b/drivers/firmware/arm_scmi/bus.c
>> @@ -344,6 +344,21 @@ static void __scmi_device_destroy(struct scmi_device *scmi_dev)
>>  	device_unregister(&scmi_dev->dev);
>>  }
>>  
>> +static int
>> +__scmi_device_set_node(struct scmi_device *scmi_dev, struct device_node *np,
>> +		       int protocol, const char *name)
>> +{
>> +	/* cpufreq device does not need to be supplier from devlink perspective */
>> +	if ((protocol == SCMI_PROTOCOL_PERF) && !strcmp(name, "cpufreq")) {
>
>I don't love this...  It seems like an hack.  Could we put a flag
>somewhere instead?  Perhaps in scmi_device?  (I'm just saying that
>because that's what we're passing to this function).

This means when creating scmi_device, a flag needs to be set which requires
to extend scmi_device_id to include a flag entry or else.

As below in scmi-cpufreq.c
{ SCMI_PROTOCOL_PERF, "cpufreq", SCMI_FWNODE_NO }

I am not sure Sudeep or Cristian are happy with the idea or not.

But back to the patch here, we are in the path creating the scmi_device and
cpufreq scmi device seems the only one that cause issue. So it should be
fine using this patch?

Thanks,
Peng


>
>regards,
>dan carpenter
>