[PATCH 0/2] firmware: arm_scmi: Ensure automatic module loading

[PATCH 0/2] firmware: arm_scmi: Ensure automatic module loading

[Bjorn Andersson]

SCMI drivers such as the Arm SCMI CPUfreq driver are allowed to built as
modules, but they are then not automatically loaded. Rework the SCMI
device table alias support to make modpost consume the information from
MODULE_DEVICE_TABLE(scmi, ...) and allow drivers to be loaded based on
this information, if known. Also add a protocol-based alias to also
trigger driver loading when only the SCMI protocol id is known.

Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
---
Bjorn Andersson (2):
      module: add SCMI device table alias support
      firmware: arm_scmi: request modules for discovered protocols

 drivers/firmware/arm_scmi/bus.c    | 19 +++++++++----------
 drivers/firmware/arm_scmi/driver.c |  2 ++
 include/linux/mod_devicetable.h    | 12 ++++++++++++
 include/linux/scmi_protocol.h      |  6 +-----
 scripts/mod/devicetable-offsets.c  |  4 ++++
 scripts/mod/file2alias.c           | 13 +++++++++++++
 6 files changed, 41 insertions(+), 15 deletions(-)
---
base-commit: 8d6dbbbe3ba62de0a63e962ee004afb848c8e3ac
change-id: 20260616-scmi-modalias-0f32421bd452

Best regards,
--  
Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>

[PATCH 1/2] module: add SCMI device table alias support

[Bjorn Andersson]

SCMI client drivers already describe their bus match data with
MODULE_DEVICE_TABLE(scmi, ...), but modpost does not know how to consume
SCMI device tables. As a result, SCMI modules do not get generated module
aliases from their id tables.

Move struct scmi_device_id to mod_devicetable.h so it has a fixed layout
visible to modpost, add the corresponding generated offsets and teach
file2alias to emit scmi:<protocol>:<name> aliases.

Use the same stable alias format for SCMI device uevents and sysfs
modaliases. The previous string included the instance-specific device
name, which is not useful for matching modules.

Assisted-by: Codex:GPT-5.5
Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
---
 drivers/firmware/arm_scmi/bus.c   | 19 +++++++++----------
 include/linux/mod_devicetable.h   | 11 +++++++++++
 include/linux/scmi_protocol.h     |  6 +-----
 scripts/mod/devicetable-offsets.c |  4 ++++
 scripts/mod/file2alias.c          | 11 +++++++++++
 5 files changed, 36 insertions(+), 15 deletions(-)

diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
index 793be9eabaed..7e344f2ee18d 100644
--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -13,11 +13,12 @@
 #include <linux/of.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/device.h>
 
 #include "common.h"
 
-#define SCMI_UEVENT_MODALIAS_FMT	"%s:%02x:%s"
+#define SCMI_UEVENT_MODALIAS_FMT	SCMI_MODULE_PREFIX "%02x:%s"
 
 BLOCKING_NOTIFIER_HEAD(scmi_requested_devices_nh);
 EXPORT_SYMBOL_GPL(scmi_requested_devices_nh);
@@ -141,7 +142,7 @@ static int scmi_protocol_table_register(const struct scmi_device_id *id_table)
 	int ret = 0;
 	const struct scmi_device_id *entry;
 
-	for (entry = id_table; entry->name && ret == 0; entry++)
+	for (entry = id_table; entry->name[0] && ret == 0; entry++)
 		ret = scmi_protocol_device_request(entry);
 
 	return ret;
@@ -197,18 +198,18 @@ scmi_protocol_table_unregister(const struct scmi_device_id *id_table)
 {
 	const struct scmi_device_id *entry;
 
-	for (entry = id_table; entry->name; entry++)
+	for (entry = id_table; entry->name[0]; entry++)
 		scmi_protocol_device_unrequest(entry);
 }
 
 static int scmi_dev_match_by_id_table(struct scmi_device *scmi_dev,
 				      const struct scmi_device_id *id_table)
 {
-	if (!id_table || !id_table->name)
+	if (!id_table || !id_table->name[0])
 		return 0;
 
 	/* Always skip transport devices from matching */
-	for (; id_table->protocol_id && id_table->name; id_table++)
+	for (; id_table->protocol_id && id_table->name[0]; id_table++)
 		if (id_table->protocol_id == scmi_dev->protocol_id &&
 		    strncmp(scmi_dev->name, "__scmi_transport_device", 23) &&
 		    !strcmp(id_table->name, scmi_dev->name))
@@ -245,7 +246,7 @@ static struct scmi_device *scmi_child_dev_find(struct device *parent,
 	struct device *dev;
 
 	id_table[0].protocol_id = prot_id;
-	id_table[0].name = name;
+	strscpy(id_table[0].name, name, sizeof(id_table[0].name));
 
 	dev = device_find_child(parent, &id_table, scmi_match_by_id_table);
 	if (!dev)
@@ -282,8 +283,7 @@ static int scmi_device_uevent(const struct device *dev, struct kobj_uevent_env *
 	const struct scmi_device *scmi_dev = to_scmi_dev(dev);
 
 	return add_uevent_var(env, "MODALIAS=" SCMI_UEVENT_MODALIAS_FMT,
-			      dev_name(&scmi_dev->dev), scmi_dev->protocol_id,
-			      scmi_dev->name);
+			      scmi_dev->protocol_id, scmi_dev->name);
 }
 
 static ssize_t modalias_show(struct device *dev,
@@ -292,8 +292,7 @@ static ssize_t modalias_show(struct device *dev,
 	struct scmi_device *scmi_dev = to_scmi_dev(dev);
 
 	return sysfs_emit(buf, SCMI_UEVENT_MODALIAS_FMT,
-			  dev_name(&scmi_dev->dev), scmi_dev->protocol_id,
-			  scmi_dev->name);
+			  scmi_dev->protocol_id, scmi_dev->name);
 }
 static DEVICE_ATTR_RO(modalias);
 
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 3b0c9a251a2e..769382f2eadd 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -473,6 +473,17 @@ struct rpmsg_device_id {
 	kernel_ulong_t driver_data;
 };
 
+/* scmi */
+
+#define SCMI_NAME_SIZE		32
+#define SCMI_MODULE_PREFIX	"scmi:"
+
+struct scmi_device_id {
+	__u8 protocol_id;
+	char name[SCMI_NAME_SIZE];
+	kernel_ulong_t driver_data;
+};
+
 /* i2c */
 
 #define I2C_NAME_SIZE	20
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 5ab73b1ab9aa..48b346a26068 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -10,6 +10,7 @@
 
 #include <linux/bitfield.h>
 #include <linux/device.h>
+#include <linux/mod_devicetable.h>
 #include <linux/notifier.h>
 #include <linux/types.h>
 
@@ -951,11 +952,6 @@ struct scmi_device {
 
 #define to_scmi_dev(d) container_of_const(d, struct scmi_device, dev)
 
-struct scmi_device_id {
-	u8 protocol_id;
-	const char *name;
-};
-
 struct scmi_driver {
 	const char *name;
 	int (*probe)(struct scmi_device *sdev);
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index b4178c42d08f..da5bd712c8da 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -144,6 +144,10 @@ int main(void)
 	DEVID(rpmsg_device_id);
 	DEVID_FIELD(rpmsg_device_id, name);
 
+	DEVID(scmi_device_id);
+	DEVID_FIELD(scmi_device_id, protocol_id);
+	DEVID_FIELD(scmi_device_id, name);
+
 	DEVID(i2c_device_id);
 	DEVID_FIELD(i2c_device_id, name);
 
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 8d36c74dec2d..a5283f4c8e6f 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -852,6 +852,16 @@ static void do_rpmsg_entry(struct module *mod, void *symval)
 	module_alias_printf(mod, false, RPMSG_DEVICE_MODALIAS_FMT, *name);
 }
 
+/* Looks like: scmi:NN:S */
+static void do_scmi_entry(struct module *mod, void *symval)
+{
+	DEF_FIELD(symval, scmi_device_id, protocol_id);
+	DEF_FIELD_ADDR(symval, scmi_device_id, name);
+
+	module_alias_printf(mod, false, SCMI_MODULE_PREFIX "%02x:%s",
+			    protocol_id, *name);
+}
+
 /* Looks like: i2c:S */
 static void do_i2c_entry(struct module *mod, void *symval)
 {
@@ -1491,6 +1501,7 @@ static const struct devtable devtable[] = {
 	{"virtio", SIZE_virtio_device_id, do_virtio_entry},
 	{"vmbus", SIZE_hv_vmbus_device_id, do_vmbus_entry},
 	{"rpmsg", SIZE_rpmsg_device_id, do_rpmsg_entry},
+	{"scmi", SIZE_scmi_device_id, do_scmi_entry},
 	{"i2c", SIZE_i2c_device_id, do_i2c_entry},
 	{"i3c", SIZE_i3c_device_id, do_i3c_entry},
 	{"slim", SIZE_slim_device_id, do_slim_entry},

-- 
2.53.0

Re: [PATCH 1/2] module: add SCMI device table alias support

[Hans de Goede]

Hi,

On 16-Jun-26 20:09, Bjorn Andersson wrote:
> SCMI client drivers already describe their bus match data with
> MODULE_DEVICE_TABLE(scmi, ...), but modpost does not know how to consume
> SCMI device tables. As a result, SCMI modules do not get generated module
> aliases from their id tables.
> 
> Move struct scmi_device_id to mod_devicetable.h so it has a fixed layout
> visible to modpost, add the corresponding generated offsets and teach
> file2alias to emit scmi:<protocol>:<name> aliases.
> 
> Use the same stable alias format for SCMI device uevents and sysfs
> modaliases. The previous string included the instance-specific device
> name, which is not useful for matching modules.
> 
> Assisted-by: Codex:GPT-5.5
> Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>

Thank you for this. One small nit, you add:

#include <linux/mod_devicetable.h>

to include/linux/scmi_protocol.h

But that header only declares pointers to struct scmi_device_id.
so you can just forward declare the struct type there and
then only include linux/mod_devicetable.h in places which actually
need it, rather then dragging all of linux/mod_devicetable.h
into any file which includes linux/scmi_protocol.h .

Some people are working on untangling the kernel headers for
faster compile times. So IMHO it would be good to not introduce
new cases of headers unnecessary including other headers.

Either way the patch looks good to me:

Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>

Regards,

Hans





> ---
>  drivers/firmware/arm_scmi/bus.c   | 19 +++++++++----------
>  include/linux/mod_devicetable.h   | 11 +++++++++++
>  include/linux/scmi_protocol.h     |  6 +-----
>  scripts/mod/devicetable-offsets.c |  4 ++++
>  scripts/mod/file2alias.c          | 11 +++++++++++
>  5 files changed, 36 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
> index 793be9eabaed..7e344f2ee18d 100644
> --- a/drivers/firmware/arm_scmi/bus.c
> +++ b/drivers/firmware/arm_scmi/bus.c
> @@ -13,11 +13,12 @@
>  #include <linux/of.h>
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
> +#include <linux/string.h>
>  #include <linux/device.h>
>  
>  #include "common.h"
>  
> -#define SCMI_UEVENT_MODALIAS_FMT	"%s:%02x:%s"
> +#define SCMI_UEVENT_MODALIAS_FMT	SCMI_MODULE_PREFIX "%02x:%s"
>  
>  BLOCKING_NOTIFIER_HEAD(scmi_requested_devices_nh);
>  EXPORT_SYMBOL_GPL(scmi_requested_devices_nh);
> @@ -141,7 +142,7 @@ static int scmi_protocol_table_register(const struct scmi_device_id *id_table)
>  	int ret = 0;
>  	const struct scmi_device_id *entry;
>  
> -	for (entry = id_table; entry->name && ret == 0; entry++)
> +	for (entry = id_table; entry->name[0] && ret == 0; entry++)
>  		ret = scmi_protocol_device_request(entry);
>  
>  	return ret;
> @@ -197,18 +198,18 @@ scmi_protocol_table_unregister(const struct scmi_device_id *id_table)
>  {
>  	const struct scmi_device_id *entry;
>  
> -	for (entry = id_table; entry->name; entry++)
> +	for (entry = id_table; entry->name[0]; entry++)
>  		scmi_protocol_device_unrequest(entry);
>  }
>  
>  static int scmi_dev_match_by_id_table(struct scmi_device *scmi_dev,
>  				      const struct scmi_device_id *id_table)
>  {
> -	if (!id_table || !id_table->name)
> +	if (!id_table || !id_table->name[0])
>  		return 0;
>  
>  	/* Always skip transport devices from matching */
> -	for (; id_table->protocol_id && id_table->name; id_table++)
> +	for (; id_table->protocol_id && id_table->name[0]; id_table++)
>  		if (id_table->protocol_id == scmi_dev->protocol_id &&
>  		    strncmp(scmi_dev->name, "__scmi_transport_device", 23) &&
>  		    !strcmp(id_table->name, scmi_dev->name))
> @@ -245,7 +246,7 @@ static struct scmi_device *scmi_child_dev_find(struct device *parent,
>  	struct device *dev;
>  
>  	id_table[0].protocol_id = prot_id;
> -	id_table[0].name = name;
> +	strscpy(id_table[0].name, name, sizeof(id_table[0].name));
>  
>  	dev = device_find_child(parent, &id_table, scmi_match_by_id_table);
>  	if (!dev)
> @@ -282,8 +283,7 @@ static int scmi_device_uevent(const struct device *dev, struct kobj_uevent_env *
>  	const struct scmi_device *scmi_dev = to_scmi_dev(dev);
>  
>  	return add_uevent_var(env, "MODALIAS=" SCMI_UEVENT_MODALIAS_FMT,
> -			      dev_name(&scmi_dev->dev), scmi_dev->protocol_id,
> -			      scmi_dev->name);
> +			      scmi_dev->protocol_id, scmi_dev->name);
>  }
>  
>  static ssize_t modalias_show(struct device *dev,
> @@ -292,8 +292,7 @@ static ssize_t modalias_show(struct device *dev,
>  	struct scmi_device *scmi_dev = to_scmi_dev(dev);
>  
>  	return sysfs_emit(buf, SCMI_UEVENT_MODALIAS_FMT,
> -			  dev_name(&scmi_dev->dev), scmi_dev->protocol_id,
> -			  scmi_dev->name);
> +			  scmi_dev->protocol_id, scmi_dev->name);
>  }
>  static DEVICE_ATTR_RO(modalias);
>  
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index 3b0c9a251a2e..769382f2eadd 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -473,6 +473,17 @@ struct rpmsg_device_id {
>  	kernel_ulong_t driver_data;
>  };
>  
> +/* scmi */
> +
> +#define SCMI_NAME_SIZE		32
> +#define SCMI_MODULE_PREFIX	"scmi:"
> +
> +struct scmi_device_id {
> +	__u8 protocol_id;
> +	char name[SCMI_NAME_SIZE];
> +	kernel_ulong_t driver_data;
> +};
> +
>  /* i2c */
>  
>  #define I2C_NAME_SIZE	20
> diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
> index 5ab73b1ab9aa..48b346a26068 100644
> --- a/include/linux/scmi_protocol.h
> +++ b/include/linux/scmi_protocol.h
> @@ -10,6 +10,7 @@
>  
>  #include <linux/bitfield.h>
>  #include <linux/device.h>
> +#include <linux/mod_devicetable.h>
>  #include <linux/notifier.h>
>  #include <linux/types.h>
>  
> @@ -951,11 +952,6 @@ struct scmi_device {
>  
>  #define to_scmi_dev(d) container_of_const(d, struct scmi_device, dev)
>  
> -struct scmi_device_id {
> -	u8 protocol_id;
> -	const char *name;
> -};
> -
>  struct scmi_driver {
>  	const char *name;
>  	int (*probe)(struct scmi_device *sdev);
> diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
> index b4178c42d08f..da5bd712c8da 100644
> --- a/scripts/mod/devicetable-offsets.c
> +++ b/scripts/mod/devicetable-offsets.c
> @@ -144,6 +144,10 @@ int main(void)
>  	DEVID(rpmsg_device_id);
>  	DEVID_FIELD(rpmsg_device_id, name);
>  
> +	DEVID(scmi_device_id);
> +	DEVID_FIELD(scmi_device_id, protocol_id);
> +	DEVID_FIELD(scmi_device_id, name);
> +
>  	DEVID(i2c_device_id);
>  	DEVID_FIELD(i2c_device_id, name);
>  
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 8d36c74dec2d..a5283f4c8e6f 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -852,6 +852,16 @@ static void do_rpmsg_entry(struct module *mod, void *symval)
>  	module_alias_printf(mod, false, RPMSG_DEVICE_MODALIAS_FMT, *name);
>  }
>  
> +/* Looks like: scmi:NN:S */
> +static void do_scmi_entry(struct module *mod, void *symval)
> +{
> +	DEF_FIELD(symval, scmi_device_id, protocol_id);
> +	DEF_FIELD_ADDR(symval, scmi_device_id, name);
> +
> +	module_alias_printf(mod, false, SCMI_MODULE_PREFIX "%02x:%s",
> +			    protocol_id, *name);
> +}
> +
>  /* Looks like: i2c:S */
>  static void do_i2c_entry(struct module *mod, void *symval)
>  {
> @@ -1491,6 +1501,7 @@ static const struct devtable devtable[] = {
>  	{"virtio", SIZE_virtio_device_id, do_virtio_entry},
>  	{"vmbus", SIZE_hv_vmbus_device_id, do_vmbus_entry},
>  	{"rpmsg", SIZE_rpmsg_device_id, do_rpmsg_entry},
> +	{"scmi", SIZE_scmi_device_id, do_scmi_entry},
>  	{"i2c", SIZE_i2c_device_id, do_i2c_entry},
>  	{"i3c", SIZE_i3c_device_id, do_i3c_entry},
>  	{"slim", SIZE_slim_device_id, do_slim_entry},
> 

[PATCH 2/2] firmware: arm_scmi: request modules for discovered protocols

[Bjorn Andersson]

SCMI client devices are created from SCMI driver id tables. If such a
driver is modular, the core does not know the driver's client name until
the module has already loaded, so normal device uevent based autoloading
cannot break the dependency cycle.

Emit a protocol-level alias for each SCMI device id table entry and
request that alias when the SCMI core discovers an implemented protocol.
This loads modules that have registered interest in the protocol; their
normal SCMI driver registration then requests the concrete client device
and the SCMI bus matches it by protocol and name.

This allows e.g. ARM_SCMI_CPUFREQ=m to autoload on systems that expose
only the SCMI Performance protocol node, where the cpufreq client name
is Linux-internal and not available from firmware before loading the
module.

Assisted-by: Codex:GPT-5.5
Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
---
 drivers/firmware/arm_scmi/driver.c | 2 ++
 include/linux/mod_devicetable.h    | 1 +
 scripts/mod/file2alias.c           | 4 +++-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 3e0d975ec94c..8538eedc7c3a 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -47,6 +47,7 @@
 #include <trace/events/scmi.h>
 
 #define SCMI_VENDOR_MODULE_ALIAS_FMT	"scmi-protocol-0x%02x-%s"
+#define SCMI_MODULE_ALIAS_FMT		SCMI_PROTOCOL_MODULE_PREFIX "0x%02x"
 
 static DEFINE_IDA(scmi_id);
 
@@ -3362,6 +3363,7 @@ static int scmi_probe(struct platform_device *pdev)
 		}
 
 		of_node_get(child);
+		request_module(SCMI_MODULE_ALIAS_FMT, prot_id);
 		scmi_create_protocol_devices(child, info, prot_id, NULL);
 	}
 
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 769382f2eadd..2cc7e78e35a3 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -477,6 +477,7 @@ struct rpmsg_device_id {
 
 #define SCMI_NAME_SIZE		32
 #define SCMI_MODULE_PREFIX	"scmi:"
+#define SCMI_PROTOCOL_MODULE_PREFIX	"scmi-protocol-"
 
 struct scmi_device_id {
 	__u8 protocol_id;
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index a5283f4c8e6f..40a37b6bf1ad 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -852,7 +852,7 @@ static void do_rpmsg_entry(struct module *mod, void *symval)
 	module_alias_printf(mod, false, RPMSG_DEVICE_MODALIAS_FMT, *name);
 }
 
-/* Looks like: scmi:NN:S */
+/* Looks like: scmi:NN:S and scmi-protocol-0xNN */
 static void do_scmi_entry(struct module *mod, void *symval)
 {
 	DEF_FIELD(symval, scmi_device_id, protocol_id);
@@ -860,6 +860,8 @@ static void do_scmi_entry(struct module *mod, void *symval)
 
 	module_alias_printf(mod, false, SCMI_MODULE_PREFIX "%02x:%s",
 			    protocol_id, *name);
+	module_alias_printf(mod, false, SCMI_PROTOCOL_MODULE_PREFIX "0x%02x",
+			    protocol_id);
 }
 
 /* Looks like: i2c:S */

-- 
2.53.0

Re: [PATCH 2/2] firmware: arm_scmi: request modules for discovered protocols

[Hans de Goede]

Hi,

On 16-Jun-26 20:09, Bjorn Andersson wrote:
> SCMI client devices are created from SCMI driver id tables. If such a
> driver is modular, the core does not know the driver's client name until
> the module has already loaded, so normal device uevent based autoloading
> cannot break the dependency cycle.
> 
> Emit a protocol-level alias for each SCMI device id table entry and
> request that alias when the SCMI core discovers an implemented protocol.
> This loads modules that have registered interest in the protocol; their
> normal SCMI driver registration then requests the concrete client device
> and the SCMI bus matches it by protocol and name.
> 
> This allows e.g. ARM_SCMI_CPUFREQ=m to autoload on systems that expose
> only the SCMI Performance protocol node, where the cpufreq client name
> is Linux-internal and not available from firmware before loading the
> module.
> 
> Assisted-by: Codex:GPT-5.5
> Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
> ---
>  drivers/firmware/arm_scmi/driver.c | 2 ++
>  include/linux/mod_devicetable.h    | 1 +
>  scripts/mod/file2alias.c           | 4 +++-
>  3 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index 3e0d975ec94c..8538eedc7c3a 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -47,6 +47,7 @@
>  #include <trace/events/scmi.h>
>  
>  #define SCMI_VENDOR_MODULE_ALIAS_FMT	"scmi-protocol-0x%02x-%s"
> +#define SCMI_MODULE_ALIAS_FMT		SCMI_PROTOCOL_MODULE_PREFIX "0x%02x"
>  
>  static DEFINE_IDA(scmi_id);
>  
> @@ -3362,6 +3363,7 @@ static int scmi_probe(struct platform_device *pdev)
>  		}
>  
>  		of_node_get(child);
> +		request_module(SCMI_MODULE_ALIAS_FMT, prot_id);

I think it would be better to use request_module_nowait() here. AFAICT there
is no need to synchronously wait here for the module to actually get loaded.

Either way the patch looks good to me:

Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>

Regards,

Hans






 


>  		scmi_create_protocol_devices(child, info, prot_id, NULL);
>  	}
>  
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index 769382f2eadd..2cc7e78e35a3 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -477,6 +477,7 @@ struct rpmsg_device_id {
>  
>  #define SCMI_NAME_SIZE		32
>  #define SCMI_MODULE_PREFIX	"scmi:"
> +#define SCMI_PROTOCOL_MODULE_PREFIX	"scmi-protocol-"
>  
>  struct scmi_device_id {
>  	__u8 protocol_id;
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index a5283f4c8e6f..40a37b6bf1ad 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -852,7 +852,7 @@ static void do_rpmsg_entry(struct module *mod, void *symval)
>  	module_alias_printf(mod, false, RPMSG_DEVICE_MODALIAS_FMT, *name);
>  }
>  
> -/* Looks like: scmi:NN:S */
> +/* Looks like: scmi:NN:S and scmi-protocol-0xNN */
>  static void do_scmi_entry(struct module *mod, void *symval)
>  {
>  	DEF_FIELD(symval, scmi_device_id, protocol_id);
> @@ -860,6 +860,8 @@ static void do_scmi_entry(struct module *mod, void *symval)
>  
>  	module_alias_printf(mod, false, SCMI_MODULE_PREFIX "%02x:%s",
>  			    protocol_id, *name);
> +	module_alias_printf(mod, false, SCMI_PROTOCOL_MODULE_PREFIX "0x%02x",
> +			    protocol_id);
>  }
>  
>  /* Looks like: i2c:S */
>