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 --- drivers/clk/clk.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 373cd54..6b582f7 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;