ARM: pxa: introduce pxa2xx_clock_sysclass for clock suspend/resume

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/clock-pxa2xx.c b/arch/arm/mach-pxa/clock-pxa2xx.c
index 416b3f06efb7..66eb531ae29b 100644
--- a/arch/arm/mach-pxa/clock-pxa2xx.c
+++ b/arch/arm/mach-pxa/clock-pxa2xx.c
@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/sysdev.h>
 
 #include <mach/pxa2xx-regs.h>
 
@@ -28,3 +29,28 @@ const struct clkops clk_pxa2xx_cken_ops = {
         .enable         = clk_pxa2xx_cken_enable,
         .disable        = clk_pxa2xx_cken_disable,
 };
+
+#ifdef CONFIG_PM
+static uint32_t saved_cken;
+
+static int pxa2xx_clock_suspend(struct sys_device *d, pm_message_t state)
+{
+        saved_cken = CKEN;
+        return 0;
+}
+
+static int pxa2xx_clock_resume(struct sys_device *d)
+{
+        CKEN = saved_cken;
+        return 0;
+}
+#else
+#define pxa2xx_clock_suspend    NULL
+#define pxa2xx_clock_resume     NULL
+#endif
+
+struct sysdev_class pxa2xx_clock_sysclass = {
+        .name           = "pxa2xx-clock",
+        .suspend        = pxa2xx_clock_suspend,
+        .resume         = pxa2xx_clock_resume,
+};