diff mbox series

[5.10,079/290] gpiolib: acpi: Add ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER quirk

Message ID 20210315135544.583551677@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman March 15, 2021, 1:52 p.m. UTC 
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

commit 62d5247d239d4b48762192a251c647d7c997616a upstream.

On some systems the ACPI tables has wrong pin number and instead of
having a relative one it provides an absolute one in the global GPIO
number space.

Add ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER quirk to cope with such cases.

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@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpio/gpiolib-acpi.c   |    7 ++++++-
 include/linux/gpio/consumer.h |    2 ++
 2 files changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -649,6 +649,7 @@  static int acpi_populate_gpio_lookup(str
 	if (!lookup->desc) {
 		const struct acpi_resource_gpio *agpio = &ares->data.gpio;
 		bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
+		struct gpio_desc *desc;
 		int pin_index;
 
 		if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
@@ -661,8 +662,12 @@  static int acpi_populate_gpio_lookup(str
 		if (pin_index >= agpio->pin_table_length)
 			return 1;
 
-		lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
+		if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
+			desc = gpio_to_desc(agpio->pin_table[pin_index]);
+		else
+			desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
 					      agpio->pin_table[pin_index]);
+		lookup->desc = desc;
 		lookup->info.pin_config = agpio->pin_config;
 		lookup->info.gpioint = gpioint;
 
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -674,6 +674,8 @@  struct acpi_gpio_mapping {
  * get GpioIo type explicitly, this quirk may be used.
  */
 #define ACPI_GPIO_QUIRK_ONLY_GPIOIO		BIT(1)
+/* Use given pin as an absolute GPIO number in the system */
+#define ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER		BIT(2)
 
 	unsigned int quirks;
 };