[PATCH V6 0/8] firmware: imx: scu/scu-irq: misc update

[PATCH V6 0/8] firmware: imx: scu/scu-irq: misc update

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@nxp.com>

V6:
 Typo fix
 Update commit message
 Drop Patch v5 3/9
 code style and error path check in patch 8

V5:
 Address sparse checking in patch 9
 Add a new patch 5

V4:
 Add static inline for irq get status when SCU not defined
 Drop two patches wrongly included

V3:
 Fix build error reported by kernel robot
 Add patch subject-prefix

V2:
 Fix build warning

Dong Aisheng (2):
  firmware: imx: scu: change init level to subsys_initcall_sync
  firmware: imx: scu: increase RPC timeout

Peng Fan (4):
  firmware: imx: scu: use soc name for soc_id
  firmware: imx: scu: use EOPNOTSUPP
  firmware: imx: scu-irq: add imx_scu_irq_get_status
  firmware: imx: scu-irq: enlarge the IMX_SC_IRQ_NUM_GROUP

Ranjani Vaidyanathan (1):
  firmware: imx: scu-irq: support identifying SCU wakeup source from
    sysfs

Robin Gong (1):
  firmware: imx: scu-irq: fix RCU complaint after M4 partition reset

 drivers/firmware/imx/imx-scu-irq.c | 118 ++++++++++++++++++++++++-----
 drivers/firmware/imx/imx-scu-soc.c |  20 ++++-
 drivers/firmware/imx/imx-scu.c     |   9 ++-
 include/linux/firmware/imx/sci.h   |  16 ++--
 4 files changed, 136 insertions(+), 27 deletions(-)

-- 
2.37.1

[PATCH V6 1/8] firmware: imx: scu: change init level to subsys_initcall_sync

[Peng Fan (OSS)]

From: Dong Aisheng <aisheng.dong@nxp.com>

Change firmware init level to subsys_initcall_sync to ensure it's
probed before most devices to avoid unnecessary defer probe.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index 47db49911e7b..2d24359420d8 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -353,7 +353,12 @@ static struct platform_driver imx_scu_driver = {
 	},
 	.probe = imx_scu_probe,
 };
-builtin_platform_driver(imx_scu_driver);
+
+static int __init imx_scu_driver_init(void)
+{
+	return platform_driver_register(&imx_scu_driver);
+}
+subsys_initcall_sync(imx_scu_driver_init);
 
 MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
 MODULE_DESCRIPTION("IMX SCU firmware protocol driver");
-- 
2.37.1

[PATCH V6 2/8] firmware: imx: scu: increase RPC timeout

[Peng Fan (OSS)]

From: Dong Aisheng <aisheng.dong@nxp.com>

When system loading is high, we can meet some command timeout
issue occasionally, so increase the timeout to a safe value.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index 2d24359420d8..14ff9d3504bf 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -20,7 +20,7 @@
 #include <linux/platform_device.h>
 
 #define SCU_MU_CHAN_NUM		8
-#define MAX_RX_TIMEOUT		(msecs_to_jiffies(30))
+#define MAX_RX_TIMEOUT		(msecs_to_jiffies(3000))
 
 struct imx_sc_chan {
 	struct imx_sc_ipc *sc_ipc;
-- 
2.37.1

[PATCH V6 3/8] firmware: imx: scu: use soc name for soc_id

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@nxp.com>

Same as soc-imx8m and soc-imx driver, use soc name for soc_id which is
user friendly.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu-soc.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/imx/imx-scu-soc.c b/drivers/firmware/imx/imx-scu-soc.c
index 2f32353de2c9..497192320562 100644
--- a/drivers/firmware/imx/imx-scu-soc.c
+++ b/drivers/firmware/imx/imx-scu-soc.c
@@ -78,6 +78,22 @@ static int imx_scu_soc_id(void)
 	return msg.data.resp.id;
 }
 
+static const char *imx_scu_soc_name(u32 id)
+{
+	switch (id) {
+	case 0x1:
+		return "i.MX8QM";
+	case 0x2:
+		return "i.MX8QXP";
+	case 0xe:
+		return "i.MX8DXL";
+	default:
+		break;
+	}
+
+	return "NULL";
+}
+
 int imx_scu_soc_init(struct device *dev)
 {
 	struct soc_device_attribute *soc_dev_attr;
@@ -113,9 +129,7 @@ int imx_scu_soc_init(struct device *dev)
 
 	/* format soc_id value passed from SCU firmware */
 	val = id & 0x1f;
-	soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
-	if (!soc_dev_attr->soc_id)
-		return -ENOMEM;
+	soc_dev_attr->soc_id = imx_scu_soc_name(val);
 
 	/* format revision value passed from SCU firmware */
 	val = (id >> 5) & 0xf;
-- 
2.37.1

[PATCH V6 4/8] firmware: imx: scu: use EOPNOTSUPP

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@nxp.com>

Per checkpatch.pl, "ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP"
So use EOPNOTSUPP to replace ENOTSUPP.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 include/linux/firmware/imx/sci.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h
index 5cc63fe7e84d..7fa0f3b329b5 100644
--- a/include/linux/firmware/imx/sci.h
+++ b/include/linux/firmware/imx/sci.h
@@ -25,27 +25,27 @@ int imx_scu_soc_init(struct device *dev);
 #else
 static inline int imx_scu_soc_init(struct device *dev)
 {
-	return -ENOTSUPP;
+	return -EOPNOTSUPP;
 }
 
 static inline int imx_scu_enable_general_irq_channel(struct device *dev)
 {
-	return -ENOTSUPP;
+	return -EOPNOTSUPP;
 }
 
 static inline int imx_scu_irq_register_notifier(struct notifier_block *nb)
 {
-	return -ENOTSUPP;
+	return -EOPNOTSUPP;
 }
 
 static inline int imx_scu_irq_unregister_notifier(struct notifier_block *nb)
 {
-	return -ENOTSUPP;
+	return -EOPNOTSUPP;
 }
 
 static inline int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
 {
-	return -ENOTSUPP;
+	return -EOPNOTSUPP;
 }
 #endif
 #endif /* _SC_SCI_H */
-- 
2.37.1

[PATCH V6 5/8] firmware: imx: scu-irq: fix RCU complaint after M4 partition reset

[Peng Fan (OSS)]

From: Robin Gong <yibin.gong@nxp.com>

Use blocking_notifier_chain instead of atomic_notifier_chain, otherwise
there will be RCU complaint, because unregister/register_virtio_device()
will issue mbox message.

mbox_send_message() is blocking again after received M4 partition reset.

Actually, no need atomic notifier for scu irq notification since this
notifier is called in worker instead of interrupt handler.

[  389.706645] i2c-rpmsg virtio0.rpmsg-i2c-channel.-1.2: i2c rpmsg driver is removed
[  389.767362] Wait for remote ready timeout, use first_notify.
[  389.774084] ------------[ cut here ]------------
[  389.778729] WARNING: CPU: 0 PID: 397 at kernel/rcu/tree_plugin.h:293 rcu_note_context_switch+0x34/0x338
[  389.788131] Modules linked in:
[  389.791195] CPU: 0 PID: 397 Comm: kworker/0:13 Not tainted 5.4.0-rc5-02977-g08f78722f07b #26
[  389.799633] Hardware name: Freescale i.MX8DXL MEK (DT)
[  389.805481] Workqueue: events imx_scu_irq_work_handler

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu-irq.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
index d9dcc20945c6..4408f150b3d5 100644
--- a/drivers/firmware/imx/imx-scu-irq.c
+++ b/drivers/firmware/imx/imx-scu-irq.c
@@ -42,25 +42,25 @@ struct imx_sc_msg_irq_enable {
 
 static struct imx_sc_ipc *imx_sc_irq_ipc_handle;
 static struct work_struct imx_sc_irq_work;
-static ATOMIC_NOTIFIER_HEAD(imx_scu_irq_notifier_chain);
+static BLOCKING_NOTIFIER_HEAD(imx_scu_irq_notifier_chain);
 
 int imx_scu_irq_register_notifier(struct notifier_block *nb)
 {
-	return atomic_notifier_chain_register(
+	return blocking_notifier_chain_register(
 		&imx_scu_irq_notifier_chain, nb);
 }
 EXPORT_SYMBOL(imx_scu_irq_register_notifier);
 
 int imx_scu_irq_unregister_notifier(struct notifier_block *nb)
 {
-	return atomic_notifier_chain_unregister(
+	return blocking_notifier_chain_unregister(
 		&imx_scu_irq_notifier_chain, nb);
 }
 EXPORT_SYMBOL(imx_scu_irq_unregister_notifier);
 
 static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group)
 {
-	return atomic_notifier_call_chain(&imx_scu_irq_notifier_chain,
+	return blocking_notifier_call_chain(&imx_scu_irq_notifier_chain,
 		status, (void *)group);
 }
 
-- 
2.37.1

[PATCH V6 6/8] firmware: imx: scu-irq: add imx_scu_irq_get_status

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@nxp.com>

Extract the scu irq get status code from imx_scu_irq_work_handler and
make into a new function imx_scu_irq_get_status which could be used
by others, such as SECO.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu-irq.c | 40 ++++++++++++++++++++----------
 include/linux/firmware/imx/sci.h   |  6 +++++
 2 files changed, 33 insertions(+), 13 deletions(-)

diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
index 4408f150b3d5..6549f3792a0f 100644
--- a/drivers/firmware/imx/imx-scu-irq.c
+++ b/drivers/firmware/imx/imx-scu-irq.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright 2019 NXP
+ * Copyright 2019,2023 NXP
  *
  * Implementation of the SCU IRQ functions using MU.
  *
@@ -66,29 +66,18 @@ static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group)
 
 static void imx_scu_irq_work_handler(struct work_struct *work)
 {
-	struct imx_sc_msg_irq_get_status msg;
-	struct imx_sc_rpc_msg *hdr = &msg.hdr;
 	u32 irq_status;
 	int ret;
 	u8 i;
 
 	for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
-		hdr->ver = IMX_SC_RPC_VERSION;
-		hdr->svc = IMX_SC_RPC_SVC_IRQ;
-		hdr->func = IMX_SC_IRQ_FUNC_STATUS;
-		hdr->size = 2;
-
-		msg.data.req.resource = mu_resource_id;
-		msg.data.req.group = i;
-
-		ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
+		ret = imx_scu_irq_get_status(i, &irq_status);
 		if (ret) {
 			pr_err("get irq group %d status failed, ret %d\n",
 			       i, ret);
 			return;
 		}
 
-		irq_status = msg.data.resp.status;
 		if (!irq_status)
 			continue;
 
@@ -97,6 +86,31 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
 	}
 }
 
+int imx_scu_irq_get_status(u8 group, u32 *irq_status)
+{
+	struct imx_sc_msg_irq_get_status msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_IRQ;
+	hdr->func = IMX_SC_IRQ_FUNC_STATUS;
+	hdr->size = 2;
+
+	msg.data.req.resource = mu_resource_id;
+	msg.data.req.group = group;
+
+	ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
+	if (ret)
+		return ret;
+
+	if (irq_status)
+		*irq_status = msg.data.resp.status;
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_scu_irq_get_status);
+
 int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
 {
 	struct imx_sc_msg_irq_enable msg;
diff --git a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h
index 7fa0f3b329b5..df17196df5ff 100644
--- a/include/linux/firmware/imx/sci.h
+++ b/include/linux/firmware/imx/sci.h
@@ -21,6 +21,7 @@ int imx_scu_enable_general_irq_channel(struct device *dev);
 int imx_scu_irq_register_notifier(struct notifier_block *nb);
 int imx_scu_irq_unregister_notifier(struct notifier_block *nb);
 int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable);
+int imx_scu_irq_get_status(u8 group, u32 *irq_status);
 int imx_scu_soc_init(struct device *dev);
 #else
 static inline int imx_scu_soc_init(struct device *dev)
@@ -47,5 +48,10 @@ static inline int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
 {
 	return -EOPNOTSUPP;
 }
+
+static inline int imx_scu_irq_get_status(u8 group, u32 *irq_status)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 #endif /* _SC_SCI_H */
-- 
2.37.1

[PATCH V6 7/8] firmware: imx: scu-irq: enlarge the IMX_SC_IRQ_NUM_GROUP

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@nxp.com>

Per SCFW update, update the IMX_SC_IRQ_NUM_GROUP to 9.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu-irq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
index 6549f3792a0f..8d902db1daf2 100644
--- a/drivers/firmware/imx/imx-scu-irq.c
+++ b/drivers/firmware/imx/imx-scu-irq.c
@@ -14,7 +14,7 @@
 
 #define IMX_SC_IRQ_FUNC_ENABLE	1
 #define IMX_SC_IRQ_FUNC_STATUS	2
-#define IMX_SC_IRQ_NUM_GROUP	4
+#define IMX_SC_IRQ_NUM_GROUP	9
 
 static u32 mu_resource_id;
 
-- 
2.37.1

Re: [PATCH V6 7/8] firmware: imx: scu-irq: enlarge the IMX_SC_IRQ_NUM_GROUP

[Daniel Baluta]

On Mon, Aug 7, 2023 at 4:11 PM Peng Fan (OSS) <peng.fan@oss.nxp.com> wrote:
>
> From: Peng Fan <peng.fan@nxp.com>
>
> Per SCFW update, update the IMX_SC_IRQ_NUM_GROUP to 9.
>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  drivers/firmware/imx/imx-scu-irq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
> index 6549f3792a0f..8d902db1daf2 100644
> --- a/drivers/firmware/imx/imx-scu-irq.c
> +++ b/drivers/firmware/imx/imx-scu-irq.c
> @@ -14,7 +14,7 @@
>
>  #define IMX_SC_IRQ_FUNC_ENABLE 1
>  #define IMX_SC_IRQ_FUNC_STATUS 2
> -#define IMX_SC_IRQ_NUM_GROUP   4
> +#define IMX_SC_IRQ_NUM_GROUP   9

This is tricky. Shouldn't we have some sort of versioning so that the user knows
that kernel and scfw are not compatible anymore?

RE: [PATCH V6 7/8] firmware: imx: scu-irq: enlarge the IMX_SC_IRQ_NUM_GROUP

[Peng Fan]

> Subject: Re: [PATCH V6 7/8] firmware: imx: scu-irq: enlarge the
> IMX_SC_IRQ_NUM_GROUP
> 
> On Mon, Aug 7, 2023 at 4:11 PM Peng Fan (OSS) <peng.fan@oss.nxp.com>
> wrote:
> >
> > From: Peng Fan <peng.fan@nxp.com>
> >
> > Per SCFW update, update the IMX_SC_IRQ_NUM_GROUP to 9.
> >
> > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> > ---
> >  drivers/firmware/imx/imx-scu-irq.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/firmware/imx/imx-scu-irq.c
> > b/drivers/firmware/imx/imx-scu-irq.c
> > index 6549f3792a0f..8d902db1daf2 100644
> > --- a/drivers/firmware/imx/imx-scu-irq.c
> > +++ b/drivers/firmware/imx/imx-scu-irq.c
> > @@ -14,7 +14,7 @@
> >
> >  #define IMX_SC_IRQ_FUNC_ENABLE 1
> >  #define IMX_SC_IRQ_FUNC_STATUS 2
> > -#define IMX_SC_IRQ_NUM_GROUP   4
> > +#define IMX_SC_IRQ_NUM_GROUP   9
> 
> This is tricky. Shouldn't we have some sort of versioning so that the user
> knows that kernel and scfw are not compatible anymore?

It would not hurt here for scu irq num group. Newer linux
could work with older scfw.

But you raised a good point, we could print scfw version when
probing scu firmware, and for un compatible case, version
check could be used.

Thanks,
Peng.

[PATCH V6 8/8] firmware: imx: scu-irq: support identifying SCU wakeup source from sysfs

[Peng Fan (OSS)]

From: Ranjani Vaidyanathan <ranjani.vaidyanathan@nxp.com>

Record SCU wakeup interrupt in /sys/power/pm_wakeup_irq
The user can further identify the exact wakeup source by using the
following interface:
cat /sys/firmware/scu_wakeup_source/wakeup_src

The above will print the wake groups and the irqs that could have
contributed to waking up the kernel. For example if ON/OFF button was the
wakeup source:
cat /sys/firmware/scu_wakeup_source/wakeup_src
Wakeup source group = 3, irq = 0x1

The user can refer to the SCFW API documentation to identify all the
wake groups and irqs.

Signed-off-by: Ranjani Vaidyanathan <ranjani.vaidyanathan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu-irq.c | 70 ++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
index 8d902db1daf2..7cc0dec04587 100644
--- a/drivers/firmware/imx/imx-scu-irq.c
+++ b/drivers/firmware/imx/imx-scu-irq.c
@@ -9,8 +9,10 @@
 #include <dt-bindings/firmware/imx/rsrc.h>
 #include <linux/firmware/imx/ipc.h>
 #include <linux/firmware/imx/sci.h>
+#include <linux/kobject.h>
 #include <linux/mailbox_client.h>
 #include <linux/suspend.h>
+#include <linux/sysfs.h>
 
 #define IMX_SC_IRQ_FUNC_ENABLE	1
 #define IMX_SC_IRQ_FUNC_STATUS	2
@@ -40,6 +42,20 @@ struct imx_sc_msg_irq_enable {
 	u8 enable;
 } __packed;
 
+struct scu_wakeup {
+	u32 mask;
+	u32 wakeup_src;
+	bool valid;
+};
+
+/* Sysfs functions */
+static struct kobject *wakeup_obj;
+static ssize_t wakeup_source_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf);
+static struct kobj_attribute wakeup_source_attr =
+		__ATTR(wakeup_src, 0660, wakeup_source_show, NULL);
+
+static struct scu_wakeup scu_irq_wakeup[IMX_SC_IRQ_NUM_GROUP];
+
 static struct imx_sc_ipc *imx_sc_irq_ipc_handle;
 static struct work_struct imx_sc_irq_work;
 static BLOCKING_NOTIFIER_HEAD(imx_scu_irq_notifier_chain);
@@ -71,6 +87,11 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
 	u8 i;
 
 	for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
+		if (scu_irq_wakeup[i].mask) {
+			scu_irq_wakeup[i].valid = false;
+			scu_irq_wakeup[i].wakeup_src = 0;
+		}
+
 		ret = imx_scu_irq_get_status(i, &irq_status);
 		if (ret) {
 			pr_err("get irq group %d status failed, ret %d\n",
@@ -80,6 +101,12 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
 
 		if (!irq_status)
 			continue;
+		if (scu_irq_wakeup[i].mask & irq_status) {
+			scu_irq_wakeup[i].valid = true;
+			scu_irq_wakeup[i].wakeup_src = irq_status & scu_irq_wakeup[i].mask;
+		} else {
+			scu_irq_wakeup[i].wakeup_src = irq_status;
+		}
 
 		pm_system_wakeup();
 		imx_scu_irq_notifier_call_chain(irq_status, &i);
@@ -135,6 +162,11 @@ int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
 		pr_err("enable irq failed, group %d, mask %d, ret %d\n",
 			group, mask, ret);
 
+	if (enable)
+		scu_irq_wakeup[group].mask |= mask;
+	else
+		scu_irq_wakeup[group].mask &= ~mask;
+
 	return ret;
 }
 EXPORT_SYMBOL(imx_scu_irq_group_enable);
@@ -144,6 +176,25 @@ static void imx_scu_irq_callback(struct mbox_client *c, void *msg)
 	schedule_work(&imx_sc_irq_work);
 }
 
+static ssize_t wakeup_source_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
+{
+	int i;
+
+	for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
+		if (!scu_irq_wakeup[i].wakeup_src)
+			continue;
+
+		if (scu_irq_wakeup[i].valid)
+			sprintf(buf, "Wakeup source group = %d, irq = 0x%x\n",
+				i, scu_irq_wakeup[i].wakeup_src);
+		else
+			sprintf(buf, "Spurious SCU wakeup, group = %d, irq = 0x%x\n",
+				i, scu_irq_wakeup[i].wakeup_src);
+	}
+
+	return strlen(buf);
+}
+
 int imx_scu_enable_general_irq_channel(struct device *dev)
 {
 	struct of_phandle_args spec;
@@ -183,6 +234,25 @@ int imx_scu_enable_general_irq_channel(struct device *dev)
 
 	mu_resource_id = IMX_SC_R_MU_0A + i;
 
+	/* Create directory under /sysfs/firmware */
+	wakeup_obj = kobject_create_and_add("scu_wakeup_source", firmware_kobj);
+	if (!wakeup_obj) {
+		ret = -ENOMEM;
+		goto free_ch;
+	}
+
+	ret = sysfs_create_file(wakeup_obj, &wakeup_source_attr.attr);
+	if (ret) {
+		dev_err(dev, "Cannot create wakeup source src file......\n");
+		kobject_put(wakeup_obj);
+		goto free_ch;
+	}
+
+	return 0;
+
+free_ch:
+	mbox_free_channel(ch);
+
 	return ret;
 }
 EXPORT_SYMBOL(imx_scu_enable_general_irq_channel);
-- 
2.37.1

Re: [PATCH V6 0/8] firmware: imx: scu/scu-irq: misc update

[Shawn Guo]

On Mon, Aug 07, 2023 at 08:14:24PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> V6:
>  Typo fix
>  Update commit message
>  Drop Patch v5 3/9
>  code style and error path check in patch 8
> 
> V5:
>  Address sparse checking in patch 9
>  Add a new patch 5
> 
> V4:
>  Add static inline for irq get status when SCU not defined
>  Drop two patches wrongly included
> 
> V3:
>  Fix build error reported by kernel robot
>  Add patch subject-prefix
> 
> V2:
>  Fix build warning
> 
> Dong Aisheng (2):
>   firmware: imx: scu: change init level to subsys_initcall_sync
>   firmware: imx: scu: increase RPC timeout
> 
> Peng Fan (4):
>   firmware: imx: scu: use soc name for soc_id
>   firmware: imx: scu: use EOPNOTSUPP
>   firmware: imx: scu-irq: add imx_scu_irq_get_status
>   firmware: imx: scu-irq: enlarge the IMX_SC_IRQ_NUM_GROUP
> 
> Ranjani Vaidyanathan (1):
>   firmware: imx: scu-irq: support identifying SCU wakeup source from
>     sysfs
> 
> Robin Gong (1):
>   firmware: imx: scu-irq: fix RCU complaint after M4 partition reset

Applied all, thanks!