linux-kernel - [PATCH v3 12/13] memory: tegra: Add debugfs entry for getting and setting the EMC rate

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Message-Id: <1414599796-30597-13-git-send-email-tomeu.vizoso@collabora.com>
Date:	Wed, 29 Oct 2014 17:22:30 +0100
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-tegra@...r.kernel.org
Cc:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 12/13] memory: tegra: Add debugfs entry for getting and setting the EMC rate

From: Mikko Perttunen <mperttunen@...dia.com>

Will be very useful when tuning memory scaling.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---
 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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