[PATCH v5 2/2] mfd: arizona: Convert GPIO IRQ handling to descriptors

[Linus Walleij]

Convert the arizona polling GPIO handling to use a GPIO descriptor
instead of passing a global GPIO number as platform data.

This mechanism is not used in the kernel, but let's preserve
the mechanism to be nice.

Users can define "irq-gpios" in the devicetree or software node
for the Arizona chip to provide the GPIO line corresponding to
the IRQ.

Reviewed-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linusw@xxxxxxxxxx>
---
 drivers/mfd/arizona-irq.c         | 50 +++++++++++++++++++++------------------
 include/linux/mfd/arizona/core.h  |  2 ++
 include/linux/mfd/arizona/pdata.h |  5 ----
 3 files changed, 29 insertions(+), 28 deletions(-)

diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
index 544016d420fe..cf8e42662585 100644
--- a/drivers/mfd/arizona-irq.c
+++ b/drivers/mfd/arizona-irq.c
@@ -136,21 +136,19 @@ static irqreturn_t arizona_irq_thread(int irq, void *data)
 			dev_err(arizona->dev,
 				"Failed to read main IRQ status: %d\n", ret);
 		}
-#ifdef CONFIG_GPIOLIB_LEGACY
 		/*
 		 * Poll the IRQ pin status to see if we're really done
 		 * if the interrupt controller can't do it for us.
 		 */
-		if (!arizona->pdata.irq_gpio) {
+		if (!arizona->irq_gpiod) {
 			break;
 		} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
-			   gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
+			   gpiod_get_value_cansleep(arizona->irq_gpiod)) {
 			poll = true;
 		} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
-			   !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
+			   !gpiod_get_value_cansleep(arizona->irq_gpiod)) {
 			poll = true;
 		}
-#endif
 	} while (poll);
 
 	pm_runtime_put_autosuspend(arizona->dev);
@@ -210,6 +208,7 @@ int arizona_irq_init(struct arizona *arizona)
 	const struct regmap_irq_chip *aod, *irq;
 	struct irq_data *irq_data;
 	unsigned int virq;
+	int gpio_irq;
 
 	arizona->ctrlif_error = true;
 
@@ -350,27 +349,32 @@ int arizona_irq_init(struct arizona *arizona)
 		goto err_map_main_irq;
 	}
 
-#ifdef CONFIG_GPIOLIB_LEGACY
-	/* Used to emulate edge trigger and to work around broken pinmux */
-	if (arizona->pdata.irq_gpio) {
-		if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
-			dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
-				 arizona->irq, arizona->pdata.irq_gpio,
-				 gpio_to_irq(arizona->pdata.irq_gpio));
-			arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
+	/*
+	 * Used to emulate edge trigger and to work around broken pinmux
+	 * define "irq-gpios" in device tree or software node.
+	 */
+	arizona->irq_gpiod = devm_gpiod_get_optional(arizona->dev, "irq",
+						     GPIOD_IN);
+	if (IS_ERR(arizona->irq_gpiod)) {
+		ret = dev_err_probe(arizona->dev,
+				    PTR_ERR(arizona->irq_gpiod),
+				    "Error getting IRQ GPIO\n");
+		goto err_main_irq;
+	}
+	if (arizona->irq_gpiod) {
+		gpio_irq = gpiod_to_irq(arizona->irq_gpiod);
+		if (gpio_irq < 0) {
+			ret = dev_err_probe(arizona->dev, gpio_irq,
+					    "GPIO IRQ line is invalid\n");
+			goto err_main_irq;
 		}
-
-		ret = devm_gpio_request_one(arizona->dev,
-					    arizona->pdata.irq_gpio,
-					    GPIOF_IN, "arizona IRQ");
-		if (ret != 0) {
-			dev_err(arizona->dev,
-				"Failed to request IRQ GPIO %d:: %d\n",
-				arizona->pdata.irq_gpio, ret);
-			arizona->pdata.irq_gpio = 0;
+		if (gpio_irq != arizona->irq) {
+			dev_warn(arizona->dev, "IRQ %d does not match GPIO's IRQ %d\n",
+				 arizona->irq, gpio_irq);
+			arizona->irq = gpio_irq;
 		}
+		gpiod_set_consumer_name(arizona->irq_gpiod, "arizona IRQ");
 	}
-#endif
 
 	ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
 				   flags, "arizona", arizona);
diff --git a/include/linux/mfd/arizona/core.h b/include/linux/mfd/arizona/core.h
index 6d6f96b2b29f..7129651c9af6 100644
--- a/include/linux/mfd/arizona/core.h
+++ b/include/linux/mfd/arizona/core.h
@@ -11,6 +11,7 @@
 #define _WM_ARIZONA_CORE_H
 
 #include <linux/clk.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/notifier.h>
 #include <linux/regmap.h>
@@ -136,6 +137,7 @@ struct arizona {
 	struct irq_domain *virq;
 	struct regmap_irq_chip_data *aod_irq_chip;
 	struct regmap_irq_chip_data *irq_chip;
+	struct gpio_desc *irq_gpiod;
 
 	bool hpdet_clamp;
 	unsigned int hp_ena;
diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
index d465dcd8c90a..2f980d51cdfa 100644
--- a/include/linux/mfd/arizona/pdata.h
+++ b/include/linux/mfd/arizona/pdata.h
@@ -178,11 +178,6 @@ struct arizona_pdata {
 	/** Haptic actuator type */
 	unsigned int hap_act;
 
-#ifdef CONFIG_GPIOLIB_LEGACY
-	/** GPIO for primary IRQ (used for edge triggered emulation) */
-	int irq_gpio;
-#endif
-
 	/** General purpose switch control */
 	unsigned int gpsw;
 };

-- 
2.54.0