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authorThierry Reding <treding@nvidia.com>2015-05-18 18:35:30 +0300
committerThierry Reding <treding@nvidia.com>2015-07-16 10:51:47 +0300
commit30a636f984984655ad5350e73a6a3141c9ba85ae (patch)
tree8aa6f27fd9a92d1495b9f9069a6542152a981c93 /drivers/memory
parentd770e558e21961ad6cfdf0ff7df0eb5d7d4f0754 (diff)
downloadlinux-30a636f984984655ad5350e73a6a3141c9ba85ae.tar.xz
memory: tegra: Expose supported rates via debugfs
In order to ease testing, expose the list of supported EMC frequencies via debugfs. Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/memory')
-rw-r--r--drivers/memory/tegra/tegra124-emc.c42
1 files changed, 40 insertions, 2 deletions
diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 8620355776fe..3dac7be39654 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -1027,7 +1027,40 @@ static int emc_debug_rate_set(void *data, u64 rate)
DEFINE_SIMPLE_ATTRIBUTE(emc_debug_rate_fops, emc_debug_rate_get,
emc_debug_rate_set, "%lld\n");
-static void emc_debugfs_init(struct device *dev)
+static int emc_debug_supported_rates_show(struct seq_file *s, void *data)
+{
+ struct tegra_emc *emc = s->private;
+ const char *prefix = "";
+ unsigned int i;
+
+ for (i = 0; i < emc->num_timings; i++) {
+ struct emc_timing *timing = &emc->timings[i];
+
+ seq_printf(s, "%s%lu", prefix, timing->rate);
+
+ prefix = " ";
+ }
+
+ seq_puts(s, "\n");
+
+ return 0;
+}
+
+static int emc_debug_supported_rates_open(struct inode *inode,
+ struct file *file)
+{
+ return single_open(file, emc_debug_supported_rates_show,
+ inode->i_private);
+}
+
+static const struct file_operations emc_debug_supported_rates_fops = {
+ .open = emc_debug_supported_rates_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc)
{
struct dentry *root, *file;
struct clk *clk;
@@ -1048,6 +1081,11 @@ static void emc_debugfs_init(struct device *dev)
&emc_debug_rate_fops);
if (!file)
dev_err(dev, "failed to create debugfs entry\n");
+
+ file = debugfs_create_file("supported_rates", S_IRUGO, root, emc,
+ &emc_debug_supported_rates_fops);
+ if (!file)
+ dev_err(dev, "failed to create debugfs entry\n");
}
static int tegra_emc_probe(struct platform_device *pdev)
@@ -1119,7 +1157,7 @@ static int tegra_emc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, emc);
if (IS_ENABLED(CONFIG_DEBUG_FS))
- emc_debugfs_init(&pdev->dev);
+ emc_debugfs_init(&pdev->dev, emc);
return 0;
};