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From: Ojaswin Mujoo <ojaswin98@gmail.com>
To: nsaenz@kernel.org
Cc: Ojaswin Mujoo <ojaswin98@gmail.com>,
	gregkh@linuxfoundation.org, stefan.wahren@i2se.com,
	dan.carpenter@oracle.com, phil@raspberrypi.com,
	linux-arm-kernel@lists.infradead.org,
	linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: [PATCH v4 4/5] staging: vchiq: Make creation of vchiq cdev optional
Date: Wed, 21 Jul 2021 21:50:52 +0530	[thread overview]
Message-ID: <846c424dd4aae14d1cc28c8f30877a06e2b7dd10.1626882325.git.ojaswin98@gmail.com> (raw)
In-Reply-To: <cover.1626882325.git.ojaswin98@gmail.com>

Before this commit, vchiq cdev (/dev/vchiq) was always created during
platform initialization. Introduce a new Kconfig option
CONFIG_VCHIQ_CDEV which determines if the cdev will be created or not.

Signed-off-by: Ojaswin Mujoo <ojaswin98@gmail.com>
---
 drivers/staging/vc04_services/Kconfig                  | 10 ++++++++++
 drivers/staging/vc04_services/Makefile                 |  5 ++++-
 .../vc04_services/interface/vchiq_arm/vchiq_arm.h      |  9 +++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/Kconfig b/drivers/staging/vc04_services/Kconfig
index 4b886293f198..63caa6818d37 100644
--- a/drivers/staging/vc04_services/Kconfig
+++ b/drivers/staging/vc04_services/Kconfig
@@ -19,6 +19,16 @@ config BCM2835_VCHIQ
 		Defaults to Y when the Broadcom Videocore services
 		are included in the build, N otherwise.
 
+if BCM2835_VCHIQ
+
+config VCHIQ_CDEV
+	bool "VCHIQ Character Driver"
+	help
+		Enable the creation of VCHIQ character driver to help
+		communicate with the Videocore platform.
+
+endif
+
 source "drivers/staging/vc04_services/bcm2835-audio/Kconfig"
 
 source "drivers/staging/vc04_services/bcm2835-camera/Kconfig"
diff --git a/drivers/staging/vc04_services/Makefile b/drivers/staging/vc04_services/Makefile
index db28be341239..0a04338fc962 100644
--- a/drivers/staging/vc04_services/Makefile
+++ b/drivers/staging/vc04_services/Makefile
@@ -7,7 +7,10 @@ vchiq-objs := \
    interface/vchiq_arm/vchiq_2835_arm.o \
    interface/vchiq_arm/vchiq_debugfs.o \
    interface/vchiq_arm/vchiq_connected.o \
-   interface/vchiq_arm/vchiq_dev.o \
+
+ifdef CONFIG_VCHIQ_CDEV
+vchiq-objs += interface/vchiq_arm/vchiq_dev.o
+endif
 
 obj-$(CONFIG_SND_BCM2835)		+= bcm2835-audio/
 obj-$(CONFIG_VIDEO_BCM2835)		+= bcm2835-camera/
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
index 2453971b6b78..e8e39a154c74 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
@@ -174,12 +174,21 @@ vchiq_instance_get_trace(struct vchiq_instance *instance);
 extern void
 vchiq_instance_set_trace(struct vchiq_instance *instance, int trace);
 
+#if IS_ENABLED(CONFIG_VCHIQ_CDEV)
+
 extern void
 vchiq_deregister_chrdev(void);
 
 extern int
 vchiq_register_chrdev(struct device *parent);
 
+#else
+
+static inline void vchiq_deregister_chrdev(void) { }
+static inline int vchiq_register_chrdev(struct device *parent) { return 0; }
+
+#endif /* IS_ENABLED(CONFIG_VCHIQ_CDEV) */
+
 extern enum vchiq_status
 service_callback(enum vchiq_reason reason, struct vchiq_header *header,
 		 unsigned int handle, void *bulk_userdata);
-- 
2.25.1


  parent reply	other threads:[~2021-07-21 16:21 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-21 16:20 [PATCH v4 0/5] vchiq: Patch to separate platform and cdev code Ojaswin Mujoo
2021-07-21 16:20 ` [PATCH v4 1/5] staging: vchiq: Refactor vchiq " Ojaswin Mujoo
2021-07-21 16:20 ` [PATCH v4 2/5] staging: vchiq: Move certain declarations to vchiq_arm.h Ojaswin Mujoo
2021-07-21 16:20 ` [PATCH v4 3/5] staging: vchiq: Move vchiq char driver to its own file Ojaswin Mujoo
2021-07-21 16:20 ` Ojaswin Mujoo [this message]
2021-07-27 13:25   ` [PATCH v4 4/5] staging: vchiq: Make creation of vchiq cdev optional Greg KH
2021-07-27 16:55     ` Ojaswin Mujoo
2021-07-21 16:20 ` [PATCH v4 5/5] staging: vchiq: Combine vchiq platform code into single file Ojaswin Mujoo
2021-07-23 11:02 ` [PATCH v4 0/5] vchiq: Patch to separate platform and cdev code Greg KH
2021-07-23 12:59   ` Ojaswin Mujoo
2021-07-23 13:31     ` Stefan Wahren
2021-07-24 10:44       ` Ojaswin Mujoo
2021-07-24  9:38 ` Stefan Wahren

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