linux-kernel - [PATCH 5.10 080/290] gpiolib: acpi: Allow to find GpioInt() resource by name and index

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Message-Id: <20210315135544.620625395@linuxfoundation.org>
Date:   Mon, 15 Mar 2021 14:52:53 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 5.10 080/290] gpiolib: acpi: Allow to find GpioInt() resource by name and index

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

commit 809390219fb9c2421239afe5c9eb862d73978ba0 upstream.

Currently only search by index is supported. However, in some cases
we might need to pass the quirks to the acpi_dev_gpio_irq_get().

For this, split out acpi_dev_gpio_irq_get_by() and replace
acpi_dev_gpio_irq_get() by calling above with NULL for name parameter.

Fixes: ba8c90c61847 ("gpio: pca953x: Override IRQ for one of the expanders on Galileo Gen 2")
Depends-on: 0ea683931adb ("gpio: dwapb: Convert driver to using the GPIO-lib-based IRQ-chip")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpio/gpiolib-acpi.c |   12 ++++++++----
 include/linux/acpi.h        |   10 ++++++++--
 2 files changed, 16 insertions(+), 6 deletions(-)

--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -916,8 +916,9 @@ struct gpio_desc *acpi_node_get_gpiod(st
 }
 
 /**
- * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
+ * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
  * @adev: pointer to a ACPI device to get IRQ from
+ * @name: optional name of GpioInt resource
  * @index: index of GpioInt resource (starting from %0)
  *
  * If the device has one or more GpioInt resources, this function can be
@@ -927,9 +928,12 @@ struct gpio_desc *acpi_node_get_gpiod(st
  * The function is idempotent, though each time it runs it will configure GPIO
  * pin direction according to the flags in GpioInt resource.
  *
+ * The function takes optional @name parameter. If the resource has a property
+ * name, then only those will be taken into account.
+ *
  * Return: Linux IRQ number (> %0) on success, negative errno on failure.
  */
-int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
+int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
 {
 	int idx, i;
 	unsigned int irq_flags;
@@ -939,7 +943,7 @@ int acpi_dev_gpio_irq_get(struct acpi_de
 		struct acpi_gpio_info info;
 		struct gpio_desc *desc;
 
-		desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
+		desc = acpi_get_gpiod_by_index(adev, name, i, &info);
 
 		/* Ignore -EPROBE_DEFER, it only matters if idx matches */
 		if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
@@ -976,7 +980,7 @@ int acpi_dev_gpio_irq_get(struct acpi_de
 	}
 	return -ENOENT;
 }
-EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
 
 static acpi_status
 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1072,19 +1072,25 @@ void __acpi_handle_debug(struct _ddebug
 #if defined(CONFIG_ACPI) && defined(CONFIG_GPIOLIB)
 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 				struct acpi_resource_gpio **agpio);
-int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index);
+int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index);
 #else
 static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 					      struct acpi_resource_gpio **agpio)
 {
 	return false;
 }
-static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
+static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
+					   const char *name, int index)
 {
 	return -ENXIO;
 }
 #endif
 
+static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
+{
+	return acpi_dev_gpio_irq_get_by(adev, NULL, index);
+}
+
 /* Device properties */
 
 #ifdef CONFIG_ACPI