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    Subject[PATCH 2/6] Clocklib: debugfs support
    Provide /sys/kernel/debug/clock to ease debugging.

    Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
    ---
    include/linux/clklib.h | 2 +
    kernel/clklib.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 76 insertions(+), 0 deletions(-)

    diff --git a/include/linux/clklib.h b/include/linux/clklib.h
    index 88ab2c1..9f1c636 100644
    --- a/include/linux/clklib.h
    +++ b/include/linux/clklib.h
    @@ -19,6 +19,7 @@ struct seq_file;
    * @get_rate: obtain the current clock rate of a specified clock
    * @set_rate: set the clock rate for a specified clock
    * @round_rate: adjust a reate to the exact rate a clock can provide
    + * @format: output any additional information for a clock
    *
    * This structure specifies clock operations that are used to configure
    * specific clock.
    @@ -30,6 +31,7 @@ struct clk_ops {
    unsigned long (*get_rate) (struct clk *clk);
    int (*set_rate) (struct clk *, unsigned long);
    long (*round_rate) (struct clk *, unsigned long);
    + int (*format) (struct clk *, struct seq_file *);
    };

    /**
    diff --git a/kernel/clklib.c b/kernel/clklib.c
    index 012f845..8d872e1 100644
    --- a/kernel/clklib.c
    +++ b/kernel/clklib.c
    @@ -324,3 +324,77 @@ out:
    return rc;
    }
    EXPORT_SYMBOL(clk_alloc_function);
    +
    +#ifdef CONFIG_DEBUG_FS
    +
    +#include <linux/debugfs.h>
    +#include <linux/seq_file.h>
    +
    +#define NAME_FIELD_LEN 20
    +
    +static void dump_clocks(struct seq_file *s, struct clk *parent, int nest)
    +{
    + struct clk *clk;
    + int i;
    +
    + list_for_each_entry(clk, &clocks, node) {
    + if (clk->parent == parent) {
    + for (i = 0; i < nest; i++) {
    + seq_putc(s, ' ');
    + seq_putc(s, ' ');
    + }
    + seq_puts(s, clk->name);
    +
    + i = 2 * nest + strlen(clk->name);
    + if (i >= NAME_FIELD_LEN)
    + i = NAME_FIELD_LEN - 1;
    + for (; i < NAME_FIELD_LEN; i++) {
    + seq_putc(s, ' ');
    + }
    + seq_printf(s, "%c use=%d rate=%10lu Hz",
    + clk->ops && clk->ops->set_parent ? '*' : ' ',
    + clk->users,
    + __clk_get_rate(clk));
    + if (clk->ops && clk->ops->format)
    + clk->ops->format(clk, s);
    + seq_putc(s, '\n');
    +
    + dump_clocks(s, clk, nest + 1);
    + }
    + }
    +}
    +
    +static int clocklib_show(struct seq_file *s, void *unused)
    +{
    + unsigned long flags;
    +
    + spin_lock_irqsave(&clocks_lock, flags);
    +
    + dump_clocks(s, NULL, 0);
    +
    + spin_unlock_irqrestore(&clocks_lock, flags);
    +
    + return 0;
    +}
    +
    +static int clocklib_open(struct inode *inode, struct file *file)
    +{
    + return single_open(file, clocklib_show, NULL);
    +}
    +
    +static struct file_operations clocklib_operations = {
    + .open = clocklib_open,
    + .read = seq_read,
    + .llseek = seq_lseek,
    + .release = single_release,
    +};
    +
    +static int __init clocklib_debugfs_init(void)
    +{
    + debugfs_create_file("clock", S_IFREG | S_IRUGO,
    + NULL, NULL, &clocklib_operations);
    + return 0;
    +}
    +subsys_initcall(clocklib_debugfs_init);
    +
    +#endif /* DEBUG_FS */
    --
    1.5.4.4

    --
    With best wishes
    Dmitry



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