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mfd: ucb1x00: Register software node for GPIO controller

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Define a static software node for the UCB1x00 GPIO controller and attach
it to the core MFD device in ucb1x00_probe(). This node will also be
used by the created GPIO chip.

This allows machine subdrivers (such as Assabet evaluation board
support) to reference the UCB1x00 GPIO controller in property entries
when converting legacy platform data to software nodes, resolving pin
bindings directly via the attached firmware node without relying on
name matching.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260706-ucb1x00-assabet-swnode-v2-1-e6271ea3d3dc@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Dmitry Torokhov 2026-07-06 22:01:30 -07:00 committed by Lee Jones
parent a302796321
commit 0674e2cd7f
2 changed files with 18 additions and 1 deletions
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16
drivers/mfd/ucb1x00-core.c
View File

@ -25,6 +25,7 @@
#include <linux/mutex.h>
#include <linux/mfd/ucb1x00.h>
#include <linux/pm.h>
#include <linux/property.h>
#include <linux/gpio/driver.h>
static DEFINE_MUTEX(ucb1x00_mutex);
@ -492,6 +493,11 @@ static struct class ucb1x00_class = {
.dev_release = ucb1x00_release,
};
const struct software_node ucb1x00_gpiochip_node = {
.name = "ucb1x00-gpio",
};
EXPORT_SYMBOL_GPL(ucb1x00_gpiochip_node);
static int ucb1x00_probe(struct mcp *mcp)
{
struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data;
@ -530,6 +536,10 @@ static int ucb1x00_probe(struct mcp *mcp)
ucb->id = id;
ucb->mcp = mcp;
ret = device_add_software_node(&ucb->dev, &ucb1x00_gpiochip_node);
if (ret)
goto err_swnode_add;
ret = device_add(&ucb->dev);
if (ret)
goto err_dev_add;
@ -604,6 +614,8 @@ static int ucb1x00_probe(struct mcp *mcp)
err_no_irq:
device_del(&ucb->dev);
err_dev_add:
device_remove_software_node(&ucb->dev);
err_swnode_add:
put_device(&ucb->dev);
out:
if (pdata && pdata->reset)
@ -630,7 +642,9 @@ static void ucb1x00_remove(struct mcp *mcp)
irq_set_chained_handler(ucb->irq, NULL);
irq_free_descs(ucb->irq_base, 16);
device_unregister(&ucb->dev);
device_del(&ucb->dev);
device_remove_software_node(&ucb->dev);
put_device(&ucb->dev);
if (pdata && pdata->reset)
pdata->reset(UCB_RST_REMOVE);

3
include/linux/mfd/ucb1x00.h
View File

@ -103,6 +103,9 @@
#define UCB_MODE_DYN_VFLAG_ENA (1 << 12)
#define UCB_MODE_AUD_OFF_CAN (1 << 13)
struct software_node;
extern const struct software_node ucb1x00_gpiochip_node;
enum ucb1x00_reset {
UCB_RST_PROBE,
UCB_RST_RESUME,