linux-kernel - Re: [PATCH v2 01/17] firmware: arm_scmi: Define a common SCMI_MAX

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Message-ID: <20260120064419.by4nvmdgdybwe76q@lcpd911>
Date: Tue, 20 Jan 2026 12:14:19 +0530
From: Dhruva Gole <d-gole@...com>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
CC: Cristian Marussi <cristian.marussi@....com>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<arm-scmi@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<sudeep.holla@....com>, <james.quinlan@...adcom.com>, <f.fainelli@...il.com>,
	<vincent.guittot@...aro.org>, <etienne.carriere@...com>,
	<peng.fan@....nxp.com>, <michal.simek@....com>, <dan.carpenter@...aro.org>,
	<elif.topuz@....com>, <lukasz.luba@....com>, <philip.radford@....com>,
	<souvik.chakravarty@....com>
Subject: Re: [PATCH v2 01/17] firmware: arm_scmi: Define a common
 SCMI_MAX_PROTOCOLS value

On Jan 19, 2026 at 11:18:27 +0000, Jonathan Cameron wrote:
> On Wed, 14 Jan 2026 11:46:05 +0000
> Cristian Marussi <cristian.marussi@....com> wrote:
> 
> > Add a common definition of SCMI_MAX_PROTOCOLS and use it all over the
> > SCMI stack.
> > 
> > Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> Hi Cristian,
> 
> Mention the introduction of SCMI_PROTOCOL_LAST in the patch description
> and probably say why it takes that value (which is much less than
> the SCMI_MAX_PROTOCOLS value).

Rather I wonder why even add it? Is it just like a documentation/ marker
or is some other usage even planned for it?

> 
> Jonathan
> 
> > ---
> >  drivers/firmware/arm_scmi/notify.c | 4 +---
> >  include/linux/scmi_protocol.h      | 3 +++
> >  2 files changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c
> > index dee9f238f6fd..78e9e27dc9ec 100644
> > --- a/drivers/firmware/arm_scmi/notify.c
> > +++ b/drivers/firmware/arm_scmi/notify.c
> > @@ -94,8 +94,6 @@
> >  #include "common.h"
> >  #include "notify.h"
> >  
> > -#define SCMI_MAX_PROTO		256
> > -
> >  #define PROTO_ID_MASK		GENMASK(31, 24)
> >  #define EVT_ID_MASK		GENMASK(23, 16)
> >  #define SRC_ID_MASK		GENMASK(15, 0)
> > @@ -1673,7 +1671,7 @@ int scmi_notification_init(struct scmi_handle *handle)
> >  	ni->gid = gid;
> >  	ni->handle = handle;
> >  
> > -	ni->registered_protocols = devm_kcalloc(handle->dev, SCMI_MAX_PROTO,
> > +	ni->registered_protocols = devm_kcalloc(handle->dev, SCMI_MAX_PROTOCOLS,
> >  						sizeof(char *), GFP_KERNEL);
> >  	if (!ni->registered_protocols)
> >  		goto err;
> > diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
> > index aafaac1496b0..c6efe4f371ac 100644
> > --- a/include/linux/scmi_protocol.h
> > +++ b/include/linux/scmi_protocol.h
> > @@ -926,8 +926,11 @@ enum scmi_std_protocol {
> >  	SCMI_PROTOCOL_VOLTAGE = 0x17,
> >  	SCMI_PROTOCOL_POWERCAP = 0x18,
> >  	SCMI_PROTOCOL_PINCTRL = 0x19,
> > +	SCMI_PROTOCOL_LAST = 0x7f,
> >  };
> >  
> > +#define SCMI_MAX_PROTOCOLS	256
> > +
> >  enum scmi_system_events {
> >  	SCMI_SYSTEM_SHUTDOWN,
> >  	SCMI_SYSTEM_COLDRESET,
> 

-- 
Best regards,
Dhruva Gole
Texas Instruments Incorporated