[PATCHv4 3/3] ARM: mx51: Add support for low power suspend on MX51

On Fri, Mar 18, 2011 at 10:21:24AM -0500, Dinh.Nguyen at freescale.com wrote:

+#include <linux/suspend.h>
+#include <linux/clk.h>
+#include <asm/mach/map.h>
+#include <asm/cacheflush.h>
+#include <asm/tlb.h>
+#include <mach/system.h>
+#include "crm_regs.h"

Why does the code below require asm/mach/map.h ?
Why does it require asm/tlb.h ?

+
+static struct clk *gpc_dvfs_clk;
+
+static int mx5_suspend_enter(suspend_state_t state)
+{
+	if (gpc_dvfs_clk == NULL)
+		gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
+
+	if (gpc_dvfs_clk) {
+		clk_enable(gpc_dvfs_clk);
+		switch (state) {
+		case PM_SUSPEND_MEM:
+			mx5_cpu_lp_set(STOP_POWER_OFF);
+			break;
+		case PM_SUSPEND_STANDBY:
+			mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		if (state == PM_SUSPEND_MEM) {
+			local_flush_tlb_all();
+			flush_cache_all();
+
+			/*clear the EMPGC0/1 bits */
+			__raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
+			__raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
+		}
+		cpu_do_idle();
+		clk_disable(gpc_dvfs_clk);
+	}else {
+		printk(KERN_ERR "Cannot enter SRPG suspend -no gpc_dvfs clock!\n");
+		return -EPERM;
+	}
+
+	return 0;
+}
+
+static int mx5_pm_valid(suspend_state_t state)
+{
+	return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
+}
+
+static const struct platform_suspend_ops mx5_suspend_ops = {
+	.valid = mx5_pm_valid,
+	.enter = mx5_suspend_enter,
+};
+
+static int __init mx5_pm_init(void)
+{
+	if (cpu_is_mx51())
+		suspend_set_ops(&mx5_suspend_ops);
+
+	return 0;
+}
+device_initcall(mx5_pm_init);
-- 
1.6.0.4