Messages in this thread Patch in this message |  | | From | Tomeu Vizoso <> | Subject | [PATCH v2 12/12] memory: tegra: Add debugfs entry for getting and setting the EMC rate | Date | Tue, 21 Oct 2014 16:45:44 +0200 |
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Will be very useful when tuning memory scaling.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.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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