git: 2c356c8b8f79 - main - gpiobus: add a gpiobus_add_bus function

[Ahmad Khalifa]

The branch main has been updated by vexeduxr:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=2c356c8b8f79c08d42b23a72b7a320b59d955a3f

commit 2c356c8b8f79c08d42b23a72b7a320b59d955a3f
Author:     Ahmad Khalifa <vexed...@freebsd.org>
AuthorDate: 2025-07-04 13:51:25 +0000
Commit:     Ahmad Khalifa <vexed...@freebsd.org>
CommitDate: 2025-07-04 13:55:55 +0000

    gpiobus: add a gpiobus_add_bus function
    
    Some drivers need to postpone the attachment of gpiobus until hardware
    init is done. Add a new gpiobus_add_bus function to accommodate this
    case.
    
    Suggested by:   mmel, andrew
    Reviewed by:    mmel, imp, andrew
    Approved by:    imp (mentor)
    MFC after:      3 days
    Differential Revision:  https://reviews.freebsd.org/D51133
---
 sys/dev/gpio/gpiobus.c    | 20 ++++++++++++++++++--
 sys/dev/gpio/gpiobusvar.h |  1 +
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/sys/dev/gpio/gpiobus.c b/sys/dev/gpio/gpiobus.c
index 2e2618805e7b..6b5379b6084a 100644
--- a/sys/dev/gpio/gpiobus.c
+++ b/sys/dev/gpio/gpiobus.c
@@ -293,7 +293,7 @@ gpiobus_print_pins(struct gpiobus_ivar *devi, struct sbuf 
*sb)
 }
 
 device_t
-gpiobus_attach_bus(device_t dev)
+gpiobus_add_bus(device_t dev)
 {
        device_t busdev;
 
@@ -307,8 +307,24 @@ gpiobus_attach_bus(device_t dev)
 #ifdef FDT
        ofw_gpiobus_register_provider(dev);
 #endif
-       bus_attach_children(dev);
+       return (busdev);
+}
 
+/*
+ * Attach a gpiobus child.
+ * Note that the controller is expected
+ * to be fully initialized at this point.
+ */
+device_t
+gpiobus_attach_bus(device_t dev)
+{
+       device_t busdev;
+
+       busdev = gpiobus_add_bus(dev);
+       if (busdev == NULL)
+               return (NULL);
+
+       bus_attach_children(dev);
        return (busdev);
 }
 
diff --git a/sys/dev/gpio/gpiobusvar.h b/sys/dev/gpio/gpiobusvar.h
index 74783e112f89..3ae0767466c9 100644
--- a/sys/dev/gpio/gpiobusvar.h
+++ b/sys/dev/gpio/gpiobusvar.h
@@ -172,6 +172,7 @@ struct resource *gpio_alloc_intr_resource(device_t 
consumer_dev, int *rid,
  * these should not be called directly by other drivers.
  */
 int gpio_check_flags(uint32_t, uint32_t);
+device_t gpiobus_add_bus(device_t);
 device_t gpiobus_attach_bus(device_t);
 int gpiobus_detach_bus(device_t);
 int gpiobus_attach(device_t);