watchdog: Convert jz4740_wdt driver to watchdog core

This patch converts jz4740_wdt driver to use watchdog core APIs. Also use devm_* APIs to save a few error handling code.

---
v3: - Remove unused define for WDT_IN_USE and WDT_OK_TO_CLOSE
- Remove mem from struct jz4740_wdt_drvdata

v2: Address all the comments by Wolfram.
- Remove unneed header file inclusion
- Drop 'heartbeat' usage in jz4740_wdt_set_heartbeat and jz4740_wdt_start
- Init wdt_dev->timeout in probe using the global 'heartbeat'
- Remove unneed pointer check for drvdata->mem

 drivers/watchdog/Kconfig      |    1 +
 drivers/watchdog/jz4740_wdt.c |  257 +++++++++++++----------------------------
 2 files changed, 84 insertions(+), 174 deletions(-)

index 2c89da6..a297f01 100644
@@ -965,6 +965,7 @@ config INDYDOG
 config JZ4740_WDT
 	tristate "Ingenic jz4740 SoC hardware watchdog"
 	depends on MACH_JZ4740
+	select WATCHDOG_CORE
 	help
 	  Hardware driver for the built-in watchdog timer on Ingenic jz4740 SoCs.
 

1.7.5.4

Thanks!

Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |