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ssb: gpio: Add and register software node for GPIO controller

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We want to convert the legacy gpio-keys platform device on BCM47XX
boards to use software nodes. To do this properly and allow
referencing the GPIO controller by address rather than relying on
name-based matching (which is being removed from the gpiolib core),
we need to associate the GPIO controller with a software node.

Introduce ssb_gpio_swnode, register it, and associate it with the
gpio_chip.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Dmitry Torokhov
2026-07-17 12:46:24 +02:00
committed by Thomas Bogendoerfer
parent 8595a96891
commit 430efd6973
2 changed files with 43 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/ssb/driver_gpio.c
+41 -7
View File
@@ -15,8 +15,14 @@
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/export.h>
#include <linux/property.h>
#include <linux/ssb/ssb.h>
const struct software_node ssb_gpio_swnode = {
.name = "ssb-gpio",
};
EXPORT_SYMBOL_GPL(ssb_gpio_swnode);
/**************************************************
* Shared
@@ -232,6 +238,8 @@ static int ssb_gpio_chipco_init(struct ssb_bus *bus)
chip->to_irq = ssb_gpio_to_irq;
#endif
chip->ngpio = 16;
if (bus->bustype == SSB_BUSTYPE_SSB)
chip->fwnode = software_node_fwnode(&ssb_gpio_swnode);
/* There is just one SoC in one device and its GPIO addresses should be
* deterministic to address them more easily. The other buses could get
* a random base number.
@@ -433,10 +441,12 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus)
* deterministic to address them more easily. The other buses could get
* a random base number.
*/
if (bus->bustype == SSB_BUSTYPE_SSB)
chip->base = 0;
else
chip->base = -1;
if (bus->bustype == SSB_BUSTYPE_SSB) {
chip->base = 0;
chip->fwnode = software_node_fwnode(&ssb_gpio_swnode);
} else {
chip->base = -1;
}
err = ssb_gpio_irq_extif_domain_init(bus);
if (err)
@@ -464,11 +474,33 @@ static int ssb_gpio_extif_init(struct ssb_bus *bus)
int ssb_gpio_init(struct ssb_bus *bus)
{
int err = 0;
/*
* Register software node only for the host SoC bus. There is only
* one SoC instance in the system, so there are no concerns with
* registration conflicts.
*/
if (bus->bustype == SSB_BUSTYPE_SSB) {
err = software_node_register(&ssb_gpio_swnode);
if (err)
return err;
}
if (ssb_chipco_available(&bus->chipco))
return ssb_gpio_chipco_init(bus);
err = ssb_gpio_chipco_init(bus);
else if (ssb_extif_available(&bus->extif))
return ssb_gpio_extif_init(bus);
return -1;
err = ssb_gpio_extif_init(bus);
else
err = -ENODEV;
if (err) {
if (bus->bustype == SSB_BUSTYPE_SSB)
software_node_unregister(&ssb_gpio_swnode);
return err;
}
return 0;
}
int ssb_gpio_unregister(struct ssb_bus *bus)
@@ -476,6 +508,8 @@ int ssb_gpio_unregister(struct ssb_bus *bus)
if (ssb_chipco_available(&bus->chipco) ||
ssb_extif_available(&bus->extif)) {
gpiochip_remove(&bus->gpio);
if (bus->bustype == SSB_BUSTYPE_SSB)
software_node_unregister(&ssb_gpio_swnode);
return 0;
}
return -1;
include/linux/ssb/ssb.h
+2
View File
@@ -671,4 +671,6 @@ int ssb_pcibios_plat_dev_init(struct pci_dev *dev);
int ssb_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin);
#endif /* CONFIG_SSB_EMBEDDED */
extern const struct software_node ssb_gpio_swnode;
#endif /* LINUX_SSB_H_ */