diff options
author | Zhangfei Gao <zhangfei.gao@linaro.org> | 2013-08-16 11:38:12 +0800 |
---|---|---|
committer | Zhangfei Gao <zhangfei.gao@linaro.org> | 2013-08-21 10:41:54 +0800 |
commit | ae90e250147423c60915b9499b29358a4bdcbac5 (patch) | |
tree | b62d906ca97089fb047481b31b908f301ad34463 | |
parent | 4e743fe9ad57459ac425a86c7097a4b07e1a2013 (diff) |
clk: debugfs add clk_rate_fops with DEBUGtracking-hilt-s40-soc-clock-08212013hi3716_soc_clocktracking-hilt-s40-soc-clock
clk_rate_fops is added to debug
1. set_rate (e.g. PLL)
2. Choose mux parent, since mux could choose parent accordingly when set_rate.
Causion: set_rate can be called directly from user space
Example:
sfc_mux have two parents: 24M and 200M
cat clk_summary
clock enable_cnt prepare_cnt rate
---------------------------------------------------------------------
osc24mhz 3 3 24000000
bpll_fout3 0 0 200000000
sfc_mux 0 0 200000000
sfc 0 0 200000000
cat osc24mhz/bpll/bpll_fout3/sfc_mux/sfc/clk_rate
200000000
echo 24000000 > osc24mhz/bpll/bpll_fout3/sfc_mux/sfc/clk_rate
cat clk_summary
clock enable_cnt prepare_cnt rate
---------------------------------------------------------------------
osc24mhz 3 3 24000000
sfc_mux 0 0 24000000
sfc 0 0 24000000
bpll_fout3 0 0 200000000
cat osc24mhz/sfc_mux/sfc/clk_rate
24000000
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
-rw-r--r-- | drivers/clk/clk.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 373cd545b969..6b582f730a05 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -226,6 +226,35 @@ static const struct file_operations clk_dump_fops = { .release = single_release, }; +#ifdef DEBUG +static int clk_rate_fops_get(void *data, u64 *rate) +{ + struct clk *clk = data; + + *rate = clk->rate; + + return 0; +}; + +static int clk_rate_fops_set(void *data, u64 rate) +{ + struct clk *clk = data; + int ret = 0; + + ret = clk_prepare_enable(clk); + if (ret) + goto out; + clk_set_rate(clk, rate); + clk_disable_unprepare(clk); + +out: + return ret; +}; + +DEFINE_SIMPLE_ATTRIBUTE(clk_rate_fops, clk_rate_fops_get, + clk_rate_fops_set, "%llu\n"); +#endif + /* caller must hold prepare_lock */ static int clk_debug_create_one(struct clk *clk, struct dentry *pdentry) { @@ -243,8 +272,13 @@ static int clk_debug_create_one(struct clk *clk, struct dentry *pdentry) clk->dentry = d; +#ifdef DEBUG + d = debugfs_create_file("clk_rate", S_IWUSR | S_IRUGO, clk->dentry, + clk, &clk_rate_fops); +#else d = debugfs_create_u32("clk_rate", S_IRUGO, clk->dentry, (u32 *)&clk->rate); +#endif if (!d) goto err_out; |