linux-kernel - [PATCH v2 2/6] gpiolib: acpi: change acpi_find

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Message-Id: <20221031-gpiolib-swnode-v2-2-81f55af5fa0e@gmail.com>
Date:   Tue,  8 Nov 2022 16:26:47 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linux-acpi@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/6] gpiolib: acpi: change acpi_find_gpio() to accept firmware node

In preparation of switching all ACPI-based GPIO lookups to go through
acpi_find_gpio() let's change it to accept device node as its argument
as we do not always have access to device structure.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/gpio/gpiolib-acpi.c | 8 ++++++--
 drivers/gpio/gpiolib-acpi.h | 4 ++--
 drivers/gpio/gpiolib.c      | 3 ++-
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 064ba5150fd4..ccb74e208989 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -906,18 +906,22 @@ static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
 	return con_id == NULL;
 }
 
-struct gpio_desc *acpi_find_gpio(struct device *dev,
+struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode,
 				 const char *con_id,
 				 unsigned int idx,
 				 enum gpiod_flags *dflags,
 				 unsigned long *lookupflags)
 {
-	struct acpi_device *adev = ACPI_COMPANION(dev);
+	struct acpi_device *adev;
 	struct acpi_gpio_info info;
 	struct gpio_desc *desc;
 	char propname[32];
 	int i;
 
+	adev = to_acpi_device_node(fwnode);
+	if (!adev)
+		return ERR_PTR(-ENODEV);
+
 	/* Try first from _DSD */
 	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
 		if (con_id) {
diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h
index 01e0cb480a00..bd1f9b92ea9e 100644
--- a/drivers/gpio/gpiolib-acpi.h
+++ b/drivers/gpio/gpiolib-acpi.h
@@ -60,7 +60,7 @@ int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
 					struct acpi_gpio_info *info);
 
-struct gpio_desc *acpi_find_gpio(struct device *dev,
+struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode,
 				 const char *con_id,
 				 unsigned int idx,
 				 enum gpiod_flags *dflags,
@@ -95,7 +95,7 @@ acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
 }
 
 static inline struct gpio_desc *
-acpi_find_gpio(struct device *dev, const char *con_id,
+acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id,
 	       unsigned int idx, enum gpiod_flags *dflags,
 	       unsigned long *lookupflags)
 {
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c5a80def8be4..eebcdaca5e06 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4081,7 +4081,8 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
 				    con_id, idx, &lookupflags);
 	} else if (is_acpi_node(fwnode)) {
 		dev_dbg(dev, "using ACPI for GPIO lookup\n");
-		desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags);
+		desc = acpi_find_gpio(fwnode,
+				      con_id, idx, &flags, &lookupflags);
 	}
 
 	/*

-- 
b4 0.11.0-dev-28747