ARM: i.MX system: Simplify handling watchdog clock

This patch simplifies handling watchdog clock a bit.
As an additional change, now we properly check WDT clock in a reset
function.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --git a/arch/arm/mach-imx/system.c b/arch/arm/mach-imx/system.c
index 3b0733e..92d11c2 100644 (file)
--- a/arch/arm/mach-imx/system.c
+++ b/arch/arm/mach-imx/system.c
@@ -42,7 +42,7 @@ void mxc_restart(enum reboot_mode mode, const char *cmd)
 {
        unsigned int wcr_enable;
 
-       if (wdog_clk)
+       if (!IS_ERR(wdog_clk))
                clk_enable(wdog_clk);
 
        if (cpu_is_mx1())
@@ -79,13 +79,10 @@ void __init mxc_arch_reset_init(void __iomem *base)
        wdog_base = base;
 
        wdog_clk = clk_get_sys("imx2-wdt.0", NULL);
-       if (IS_ERR(wdog_clk)) {
+       if (IS_ERR(wdog_clk))
                pr_warn("%s: failed to get wdog clock\n", __func__);
-               wdog_clk = NULL;
-               return;
-       }
-
-       clk_prepare(wdog_clk);
+       else
+               clk_prepare(wdog_clk);
 }
 
 void __init mxc_arch_reset_init_dt(void)
@@ -97,13 +94,10 @@ void __init mxc_arch_reset_init_dt(void)
        WARN_ON(!wdog_base);
 
        wdog_clk = of_clk_get(np, 0);
-       if (IS_ERR(wdog_clk)) {
+       if (IS_ERR(wdog_clk))
                pr_warn("%s: failed to get wdog clock\n", __func__);
-               wdog_clk = NULL;
-               return;
-       }
-
-       clk_prepare(wdog_clk);
+       else
+               clk_prepare(wdog_clk);
 }
 
 #ifdef CONFIG_CACHE_L2X0