linux-kernel - [PATCH v4 1/7] video: xilinxfb: Fix OF probing on little-endian systems

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Message-Id: <262ff72a86eda8d0dfadd11783340a77d04e9b67.1370254386.git.michal.simek@xilinx.com>
Date:	Mon,  3 Jun 2013 12:13:16 +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>,
	Arnd Bergmann <arnd@...db.de>, Timur Tabi <timur@...i.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-fbdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH v4 1/7] video: xilinxfb: Fix OF probing on little-endian systems

From: Michal Simek <monstr@...str.eu>

DTB is always big-endian that's why it is necessary
to properly convert value (*p).
It is automatically done in of_property_read_u32().

Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
Changes in v4: None
Changes in v3:
- fix commit message

Changes in v2:
- use of_property_read_u32 helper function

 drivers/video/xilinxfb.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
index af0b4fd..aecd15d 100644
--- a/drivers/video/xilinxfb.c
+++ b/drivers/video/xilinxfb.c
@@ -406,8 +406,7 @@ static int xilinxfb_release(struct device *dev)
 static int xilinxfb_of_probe(struct platform_device *op)
 {
 	const u32 *prop;
-	u32 *p;
-	u32 tft_access;
+	u32 tft_access = 0;
 	struct xilinxfb_platform_data pdata;
 	struct resource res;
 	int size, rc;
@@ -427,8 +426,8 @@ static int xilinxfb_of_probe(struct platform_device *op)
 	 * To check whether the core is connected directly to DCR or PLB
 	 * interface and initialize the tft_access accordingly.
 	 */
-	p = (u32 *)of_get_property(op->dev.of_node, "xlnx,dcr-splb-slave-if", NULL);
-	tft_access = p ? *p : 0;
+	of_property_read_u32(op->dev.of_node, "xlnx,dcr-splb-slave-if",
+			     &tft_access);

 	/*
 	 * Fill the resource structure if its direct PLB interface
--
1.8.2.3


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