linux-kernel - [PATCH v3 3/8] watchdog: at91rm9200: use the regmap from mfd

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Date:	Mon, 12 Jan 2015 16:36:58 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-watchdog@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH v3 3/8] watchdog: at91rm9200: use the regmap from mfd

The system timer MFD driver is providing a regmap. Use it to access the
registers.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
 drivers/watchdog/Kconfig          |  2 +-
 drivers/watchdog/at91rm9200_wdt.c | 25 ++++++++++++-------------
 2 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 08f41add1461..18c73bc159fc 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -154,7 +154,7 @@ config ARM_SP805_WATCHDOG
 
 config AT91RM9200_WATCHDOG
 	tristate "AT91RM9200 watchdog"
-	depends on SOC_AT91RM9200
+	depends on SOC_AT91RM9200 && MFD_ATMEL_ST
 	help
 	  Watchdog timer embedded into AT91RM9200 chips. This will reboot your
 	  system when the timeout is reached.
diff --git a/drivers/watchdog/at91rm9200_wdt.c b/drivers/watchdog/at91rm9200_wdt.c
index d244112d5b6f..a4ac88e450a2 100644
--- a/drivers/watchdog/at91rm9200_wdt.c
+++ b/drivers/watchdog/at91rm9200_wdt.c
@@ -17,22 +17,24 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/mfd/atmel-st.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>
 #include <linux/uaccess.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <mach/at91_st.h>
 
 #define WDT_DEFAULT_TIME	5	/* seconds */
 #define WDT_MAX_TIME		256	/* seconds */
 
 static int wdt_time = WDT_DEFAULT_TIME;
 static bool nowayout = WATCHDOG_NOWAYOUT;
+static struct regmap *regmap_st;
 
 module_param(wdt_time, int, 0);
 MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
@@ -55,7 +57,7 @@ static unsigned long at91wdt_busy;
  */
 static inline void at91_wdt_stop(void)
 {
-	at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN);
+	regmap_write(regmap_st, AT91_ST_WDMR, AT91_ST_EXTEN);
 }
 
 /*
@@ -63,9 +65,9 @@ static inline void at91_wdt_stop(void)
  */
 static inline void at91_wdt_start(void)
 {
-	at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
+	regmap_write(regmap_st, AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
 				(((65536 * wdt_time) >> 8) & AT91_ST_WDV));
-	at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
+	regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);
 }
 
 /*
@@ -73,7 +75,7 @@ static inline void at91_wdt_start(void)
  */
 static inline void at91_wdt_reload(void)
 {
-	at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
+	regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);
 }
 
 /* ......................................................................... */
@@ -209,6 +211,10 @@ static int at91wdt_probe(struct platform_device *pdev)
 		return -EBUSY;
 	at91wdt_miscdev.parent = &pdev->dev;
 
+	regmap_st = dev_get_drvdata(pdev->dev.parent);
+	if (!regmap_st)
+		return -ENODEV;
+
 	res = misc_register(&at91wdt_miscdev);
 	if (res)
 		return res;
@@ -254,12 +260,6 @@ static int at91wdt_resume(struct platform_device *pdev)
 #define at91wdt_resume	NULL
 #endif
 
-static const struct of_device_id at91_wdt_dt_ids[] = {
-	{ .compatible = "atmel,at91rm9200-wdt" },
-	{ /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, at91_wdt_dt_ids);
-
 static struct platform_driver at91wdt_driver = {
 	.probe		= at91wdt_probe,
 	.remove		= at91wdt_remove,
@@ -267,8 +267,7 @@ static struct platform_driver at91wdt_driver = {
 	.suspend	= at91wdt_suspend,
 	.resume		= at91wdt_resume,
 	.driver		= {
-		.name	= "at91_wdt",
-		.of_match_table = at91_wdt_dt_ids,
+		.name	= "atmel_st_watchdog",
 	},
 };
 
-- 
2.1.0

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