linux-kernel - [RFC PATCH 1/7] firmware: arm_scmi: Define a common SCMI_MAX

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Message-ID: <20250620192813.2463367-2-cristian.marussi@arm.com>
Date: Fri, 20 Jun 2025 20:28:07 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org
Cc: 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,
	quic_sibis@...cinc.com,
	dan.carpenter@...aro.org,
	d-gole@...com,
	souvik.chakravarty@....com,
	Cristian Marussi <cristian.marussi@....com>
Subject: [RFC PATCH 1/7] firmware: arm_scmi: Define a common SCMI_MAX_PROTOCOLS value

Add a common definition of SCMI_MAX_PROTOCOLS and use it all over the
SCMI stack.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 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 e160ecb22948..27a53a6729dd 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)
@@ -1652,7 +1650,7 @@ 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 688466a0e816..6f8d36e1f8fc 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 = 0xff,
 };
 
+#define SCMI_MAX_PROTOCOLS	(SCMI_PROTOCOL_LAST + 1)
+
 enum scmi_system_events {
 	SCMI_SYSTEM_SHUTDOWN,
 	SCMI_SYSTEM_COLDRESET,
-- 
2.47.0