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memory: tegra: Expose supported rates via debugfs

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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>
This commit is contained in:
Thierry Reding 2015-05-18 17:35:30 +02:00
parent d770e558e2
commit 30a636f984
1 changed files with 40 additions and 2 deletions
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42
drivers/memory/tegra/tegra124-emc.c
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@ -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;
};