From: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Will be very useful when tuning memory scaling.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---
drivers/memory/tegra/tegra124-emc.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 8438de2..abe2525 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -20,6 +20,7 @@
#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of_address.h>
@@ -1034,6 +1035,39 @@ void tegra_emc_complete_timing_change(unsigned long rate)
emc_complete_timing_change(emc_instance, emc_instance->timings + i);
}
+/* * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Debugfs entry *
+ * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static int emc_debug_rate_get(void *data, u64 *rate)
+{
+ struct clk *c = data;
+
+ *rate = clk_get_rate(c);
+
+ return 0;
+}
+
+static int emc_debug_rate_set(void *data, u64 rate)
+{
+ struct clk *c = data;
+
+ return clk_set_rate(c, rate);
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(emc_debug_rate_fops, emc_debug_rate_get,
+ emc_debug_rate_set, "%lld\n");
+
+void emc_debugfs_init(void)
+{
+ struct dentry *d;
+
+ d = debugfs_create_file("emc_rate", S_IRUGO | S_IWUSR, NULL, clk_get_sys("tegra-clk-debug", "emc"),
+ &emc_debug_rate_fops);
+ if (!d)
+ pr_warn("failed to create debugfs entries\n");
+}
+
static int tegra_emc_probe(struct platform_device *pdev)
{
struct tegra_emc *tegra;
@@ -1111,6 +1145,8 @@ static int tegra_emc_probe(struct platform_device *pdev)
emc_instance = tegra;
+ emc_debugfs_init();
+
return 0;
};
--
1.9.3
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