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watchdog: imx2_wdt: adds big endianness support.

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This watchdog driver will be working on IMX2+, Vybrid, LS1, LS2+
platforms, and will be in different endianness mode in those SoCs:

    SoCs       WDT endian mode
------------------------------------
    IMX2+           LE
    Vybird          LE
    LS1             BE
    LS2             LE

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Xiubo Li 2014-06-03 10:45:14 +08:00 • committed by Wim Van Sebroeck
parent 2cdf25bb57
commit f728f4bfc4
2 changed files with 12 additions and 0 deletions
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5
Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.txt
View file

@ -5,10 +5,15 @@ Required properties:
- reg : Should contain WDT registers location and length - reg : Should contain WDT registers location and length
- interrupts : Should contain WDT interrupt - interrupts : Should contain WDT interrupt
Optional property:
- big-endian: If present the watchdog device's registers are implemented
in big endian mode, otherwise in little mode.
Examples: Examples:
wdt@73f98000 { wdt@73f98000 {
compatible = "fsl,imx51-wdt", "fsl,imx21-wdt"; compatible = "fsl,imx51-wdt", "fsl,imx21-wdt";
reg = <0x73f98000 0x4000>; reg = <0x73f98000 0x4000>;
interrupts = <58>; interrupts = <58>;
big-endian;
}; };

7
drivers/watchdog/imx2_wdt.c
View file

@ -28,6 +28,7 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/moduleparam.h> #include <linux/moduleparam.h>
#include <linux/of_address.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/regmap.h> #include <linux/regmap.h>
#include <linux/timer.h> #include <linux/timer.h>
@ -190,10 +191,12 @@ static struct regmap_config imx2_wdt_regmap_config = {
static int __init imx2_wdt_probe(struct platform_device *pdev) static int __init imx2_wdt_probe(struct platform_device *pdev)
{ {
struct device_node *np = pdev->dev.of_node;
struct imx2_wdt_device *wdev; struct imx2_wdt_device *wdev;
struct watchdog_device *wdog; struct watchdog_device *wdog;
struct resource *res; struct resource *res;
void __iomem *base; void __iomem *base;
bool big_endian;
int ret; int ret;
u32 val; u32 val;
@ -201,6 +204,10 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
if (!wdev) if (!wdev)
return -ENOMEM; return -ENOMEM;
big_endian = of_property_read_bool(np, "big-endian");
if (big_endian)
imx2_wdt_regmap_config.val_format_endian = REGMAP_ENDIAN_BIG;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res); base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base)) if (IS_ERR(base))