rtc: s3c: remove warning message when checking coding style with checkpatch script

Remove warning message when checking codeing style with checkpatch script
and reduce un-necessary i2c read operation on s3c_rtc_enable.

    WARNING: line over 80 characters
    #406: FILE: drivers/rtc/rtc-s3c.c:406:
    +		if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {

    WARNING: line over 80 characters
    #414: FILE: drivers/rtc/rtc-s3c.c:414:
    +		if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {

    WARNING: line over 80 characters
    #422: FILE: drivers/rtc/rtc-s3c.c:422:
    +		if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {

    WARNING: Missing a blank line after declarations
    #451: FILE: drivers/rtc/rtc-s3c.c:451:
    +	struct s3c_rtc_drv_data *data;
    +	if (pdev->dev.of_node) {

    WARNING: Missing a blank line after declarations
    #453: FILE: drivers/rtc/rtc-s3c.c:453:
    +		const struct of_device_id *match;
    +		match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);

    WARNING: DT compatible string "samsung,s3c2416-rtc" appears un-documented -- check ./Documentation/devicetree/bindings/
    #650: FILE: drivers/rtc/rtc-s3c.c:650:
    +		.compatible = "samsung,s3c2416-rtc",

    WARNING: DT compatible string "samsung,s3c2443-rtc" appears un-documented -- check ./Documentation/devicetree/bindings/
    #653: FILE: drivers/rtc/rtc-s3c.c:653:
    +		.compatible = "samsung,s3c2443-rtc",
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/devicetree/bindings/rtc/s3c-rtc.txt

@@ -3,6 +3,8 @@
 Required properties:
 - compatible: should be one of the following.
     * "samsung,s3c2410-rtc" - for controllers compatible with s3c2410 rtc.
+    * "samsung,s3c2416-rtc" - for controllers compatible with s3c2416 rtc.
+    * "samsung,s3c2443-rtc" - for controllers compatible with s3c2443 rtc.
     * "samsung,s3c6410-rtc" - for controllers compatible with s3c6410 rtc.
 - reg: physical base address of the controller and length of memory mapped
   region.

drivers/rtc/rtc-s3c.c

@@ -382,25 +382,25 @@ static const struct rtc_class_ops s3c_rtcops = {
 
 static void s3c_rtc_enable(struct s3c_rtc *info, int en)
 {
-	unsigned int tmp;
+	unsigned int con, tmp;
 
 	clk_enable(info->rtc_clk);
+
+	con = readw(info->base + S3C2410_RTCCON);
 	if (!en) {
-		tmp = readw(info->base + S3C2410_RTCCON);
 		if (info->cpu_type == TYPE_S3C64XX)
-			tmp &= ~S3C64XX_RTCCON_TICEN;
-		tmp &= ~S3C2410_RTCCON_RTCEN;
-		writew(tmp, info->base + S3C2410_RTCCON);
+			con &= ~S3C64XX_RTCCON_TICEN;
+		con &= ~S3C2410_RTCCON_RTCEN;
+		writew(con, info->base + S3C2410_RTCCON);
 
 		if (info->cpu_type != TYPE_S3C64XX) {
-			tmp = readb(info->base + S3C2410_TICNT);
-			tmp &= ~S3C2410_TICNT_ENABLE;
-			writeb(tmp, info->base + S3C2410_TICNT);
+			con = readb(info->base + S3C2410_TICNT);
+			con &= ~S3C2410_TICNT_ENABLE;
+			writeb(con, info->base + S3C2410_TICNT);
 		}
 	} else {
 		/* re-enable the device, and check it is ok */
-
-		if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
+		if ((con & S3C2410_RTCCON_RTCEN) == 0) {
 			dev_info(info->dev, "rtc disabled, re-enabling\n");
 
 			tmp = readw(info->base + S3C2410_RTCCON);
@@ -408,7 +408,7 @@ static void s3c_rtc_enable(struct s3c_rtc *info, int en)
 				info->base + S3C2410_RTCCON);
 		}
 
-		if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
+		if (con & S3C2410_RTCCON_CNTSEL) {
 			dev_info(info->dev, "removing RTCCON_CNTSEL\n");
 
 			tmp = readw(info->base + S3C2410_RTCCON);
@@ -416,7 +416,7 @@ static void s3c_rtc_enable(struct s3c_rtc *info, int en)
 				info->base + S3C2410_RTCCON);
 		}
 
-		if ((readw(info->base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
+		if (con & S3C2410_RTCCON_CLKRST) {
 			dev_info(info->dev, "removing RTCCON_CLKRST\n");
 
 			tmp = readw(info->base + S3C2410_RTCCON);
@@ -445,8 +445,10 @@ static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
 {
 #ifdef CONFIG_OF
 	struct s3c_rtc_drv_data *data;
+
 	if (pdev->dev.of_node) {
 		const struct of_device_id *match;
+
 		match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
 		data = (struct s3c_rtc_drv_data *) match->data;
 		return data->cpu_type;