[PATCH 2/6] [v6] Input: gpio-keys: make legacy gpiolib optional

From: Arnd Bergmann <arnd@kernel.org>
Date: 2026-07-10 21:19:11
Also in: linux-gpio, linux-leds, linux-sh, lkml
Reply to: Arnd Bergmann, 2026-07-10

From: Arnd Bergmann <arnd@arndb.de>

Most users of gpio-keys and gpio-keys-polled use modern gpiolib
interfaces, but there are still number of ancient sh, arm32 and x86
machines that have never been converted.

Add an #ifdef block for the parts of the driver that are only used on
those legacy machines.

The two Rohm PMIC drivers use a gpio-keys device without an actual GPIO,
passing an IRQ number instead. In order to keep this working both with
and with CONFIG_GPIOLIB_LEGACY, change the gpio-keys driver to ignore
the gpio number if an IRQ is passed.

Link: https://lore.kernel.org/all/b3c94552-c104-42e3-be15-7e8362e8039e@gmail.com/ (local)
Link: https://lore.kernel.org/all/afJXG4_rtaj3l2Dk@google.com/ (local)
Link: https://lore.kernel.org/all/ajQ-CtU131FAJ9ES@google.com/ (local)
Acked-by: Bartosz Golaszewski <redacted>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> # for input
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v3..v5: resend
    v2: skip the fake GPIO number passing from mfd

This patch now has a small conflict with the rework of the rohm drivers
to use software nodes. That patch is the one we want, and then
the drivers/mfd changes here can get dropped, but the two need to
get merged in the correct order.
---
 drivers/input/keyboard/gpio_keys.c        | 9 +++++----
 drivers/input/keyboard/gpio_keys_polled.c | 4 +++-
 drivers/mfd/rohm-bd71828.c                | 1 -
 drivers/mfd/rohm-bd718x7.c                | 1 -
 include/linux/gpio_keys.h                 | 2 ++
 5 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index e19617485679..e988657f97cb 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c

@@ -23,8 +23,8 @@
 #include <linux/input.h>
 #include <linux/gpio_keys.h>
 #include <linux/workqueue.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
+#include <linux/gpio/legacy.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/spinlock.h>

@@ -528,7 +528,8 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
 			 */
 			bdata->gpiod = NULL;
 		}
-	} else if (gpio_is_valid(button->gpio)) {
+#ifdef CONFIG_GPIOLIB_LEGACY
+	} else if (!button->irq && gpio_is_valid(button->gpio)) {
 		/*
 		 * Legacy GPIO number, so request the GPIO here and
 		 * convert it to descriptor.

@@ -546,6 +547,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
 
 		if (button->active_low ^ gpiod_is_active_low(bdata->gpiod))
 			gpiod_toggle_active_low(bdata->gpiod);
+#endif
 	}
 
 	if (bdata->gpiod) {

@@ -583,8 +585,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
 			if (irq < 0) {
 				error = irq;
 				dev_err_probe(dev, error,
-					      "Unable to get irq number for GPIO %d\n",
-					      button->gpio);
+					      "Unable to get irq number for GPIO\n");
 				return error;
 			}
 			bdata->irq = irq;

diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index e6707d72210e..4e7a366ff05b 100644
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c

@@ -18,8 +18,8 @@
 #include <linux/input.h>
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
+#include <linux/gpio/legacy.h>
 #include <linux/gpio_keys.h>
 #include <linux/property.h>

@@ -301,6 +301,7 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
 				return dev_err_probe(dev, PTR_ERR(bdata->gpiod),
 						     "failed to get gpio\n");
 			}
+#ifdef CONFIG_GPIOLIB_LEGACY
 		} else if (gpio_is_valid(button->gpio)) {
 			/*
 			 * Legacy GPIO number so request the GPIO here and

@@ -323,6 +324,7 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
 
 			if (button->active_low ^ gpiod_is_active_low(bdata->gpiod))
 				gpiod_toggle_active_low(bdata->gpiod);
+#endif
 		}
 
 		bdata->last_state = -1;

diff --git a/drivers/mfd/rohm-bd71828.c b/drivers/mfd/rohm-bd71828.c
index a79f354bf5cb..df6dad762ec9 100644
--- a/drivers/mfd/rohm-bd71828.c
+++ b/drivers/mfd/rohm-bd71828.c

@@ -39,7 +39,6 @@
 
 static struct gpio_keys_button button = {
 	.code = KEY_POWER,
-	.gpio = -1,
 	.type = EV_KEY,
 	.wakeup = 1,
 };

diff --git a/drivers/mfd/rohm-bd718x7.c b/drivers/mfd/rohm-bd718x7.c
index ff714fd4f54d..dd774aa8828b 100644
--- a/drivers/mfd/rohm-bd718x7.c
+++ b/drivers/mfd/rohm-bd718x7.c

@@ -20,7 +20,6 @@
 
 static struct gpio_keys_button button = {
 	.code = KEY_POWER,
-	.gpio = -1,
 	.type = EV_KEY,
 };

diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h
index 80fa930b04c6..e8d6dc290efb 100644
--- a/include/linux/gpio_keys.h
+++ b/include/linux/gpio_keys.h

@@ -25,7 +25,9 @@ struct device;
  */
 struct gpio_keys_button {
 	unsigned int code;
+#ifdef CONFIG_GPIOLIB_LEGACY
 	int gpio;
+#endif
 	int active_low;
 	const char *desc;
 	unsigned int type;

-- 
2.39.5

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