linux-kernel - [PATCH v2 1/6] GPIO: xilinx: Simplify driver probe function

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Date:	Mon,  3 Jun 2013 14:31:16 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	linux-kernel@...r.kernel.org
Cc:	Michal Simek <monstr@...str.eu>,
	Michal Simek <michal.simek@...inx.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH v2 1/6] GPIO: xilinx: Simplify driver probe function

Simplification is done by using OF helper function
which increase readability of code and remove
(if (var) var = be32_to_cpup;) assignment.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
Changes in v2:
- New patch in this series

 drivers/gpio/gpio-xilinx.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 9ae7aa8..2aad534 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -170,24 +170,20 @@ static int xgpio_of_probe(struct device_node *np)
 		return -ENOMEM;

 	/* Update GPIO state shadow register with default value */
-	tree_info = of_get_property(np, "xlnx,dout-default", NULL);
-	if (tree_info)
-		chip->gpio_state = be32_to_cpup(tree_info);
+	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state);
+
+	/* By default, all pins are inputs */
+	chip->gpio_dir = 0xFFFFFFFF;

 	/* Update GPIO direction shadow register with default value */
-	chip->gpio_dir = 0xFFFFFFFF; /* By default, all pins are inputs */
-	tree_info = of_get_property(np, "xlnx,tri-default", NULL);
-	if (tree_info)
-		chip->gpio_dir = be32_to_cpup(tree_info);
+	of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir);
+
+	/* By default assume full GPIO controller */
+	chip->mmchip.gc.ngpio = 32;

 	/* Check device node and parent device node for device width */
-	chip->mmchip.gc.ngpio = 32; /* By default assume full GPIO controller */
-	tree_info = of_get_property(np, "xlnx,gpio-width", NULL);
-	if (!tree_info)
-		tree_info = of_get_property(np->parent,
-					    "xlnx,gpio-width", NULL);
-	if (tree_info)
-		chip->mmchip.gc.ngpio = be32_to_cpup(tree_info);
+	of_property_read_u32(np, "xlnx,gpio-width",
+			      (u32 *)&chip->mmchip.gc.ngpio);

 	spin_lock_init(&chip->gpio_lock);

--
1.8.2.3


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