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| author |   Thierry Reding <treding@nvidia.com> | 2015-05-18 17:35:30 +0200 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2015-07-16 09:51:47 +0200 |
| commit | 30a636f984984655ad5350e73a6a3141c9ba85ae (patch) | |
| tree | 8aa6f27fd9a92d1495b9f9069a6542152a981c93 /drivers/memory | |
| parent | Linux 4.2-rc1 (diff) | |
| download | linux-dev-30a636f984984655ad5350e73a6a3141c9ba85ae.tar.xz linux-dev-30a636f984984655ad5350e73a6a3141c9ba85ae.zip | |
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.c | 42 |
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; }; |