[PATCH v5 13/14] memory: tegra: Add debugfs entry for getting and setting the EMC rate

Tomeu Vizoso
2014-11-18T12:24:13Z

From: Mikko Perttunen <mperttunen@nvidia.com>

Will be very useful when tuning memory scaling.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---
drivers/memory/tegra/tegra124-emc.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 7036ad5..d4817b6 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -18,6 +18,7 @@
#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>
@@ -1036,6 +1037,38 @@ static struct device_node *tegra_emc_find_node_by_ram_code(
return NULL;
}

+/* 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;
@@ -1106,6 +1139,8 @@ static int tegra_emc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, tegra);

+ emc_debugfs_init();
+
return 0;
};

--
1.9.3