Messages in this thread Patch in this message | | | From | Tomeu Vizoso <> | Subject | [PATCH v8 14/18] memory: tegra: Add debugfs entry for getting and setting the EMC rate | Date | Thu, 12 Mar 2015 15:48:06 +0100 |
| |
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 327467b..f61717b 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/of_address.h> #include <linux/of_platform.h> @@ -1035,6 +1036,38 @@ 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; @@ -1105,6 +1138,8 @@ static int tegra_emc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, tegra); + emc_debugfs_init(); + return 0; }; -- 2.1.0
| |