Quoting Peter De Schrijver (2014-06-26 08:00:53)
> Define and export a new function clk_debugs_add_file which adds a file
> to a existing clock's debugfs directory. This can be used by clock
> providers to add debugfs entries which are not related to a specific clock
> type. Examples include the ability to measure the rate of a clock. It can
> also be used by modules to create new debugfs entries. This is useful if you
> want to expose features for testing which can potentially cause system
> instability such as allowing to change a clock's rate from userspace.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@xxxxxxxxxx>
Applied to clk-next. If you have some useful examples of how you use
this in downstream kernels or in out-of-tree modules then it would be
great to post them to the list. Others might find them helpful.
Regards,
Mike
>
> ---
> Changes in v3:
> * export a function to create a new file in a clock's debugfs directory
> instead of exposing the clock's debugfs dentry pointer
>
> Changes in v2:
> * fix function name in description
> * export function in header file
> ---
> drivers/clk/clk.c | 12 ++++++++++++
> include/linux/clk-provider.h | 5 +++++
> 2 files changed, 17 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 8b73ede..c1e2fab 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -403,6 +403,18 @@ static void clk_debug_reparent(struct clk *clk, struct clk *new_parent)
> __func__, clk->name);
> }
>
> +struct dentry *clk_debugfs_add_file(struct clk *clk, char *name, umode_t mode,
> + void *data, const struct file_operations *fops)
> +{
> + struct dentry *d = NULL;
> +
> + if (clk->dentry)
> + d = debugfs_create_file(name, mode, clk->dentry, data, fops);
> +
> + return d;
> +}
> +EXPORT_SYMBOL_GPL(clk_debugfs_add_file);
> +
> /**
> * clk_debug_init - lazily create the debugfs clk tree visualization
> *
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 0c287db..411dd7e 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -619,5 +619,10 @@ static inline void clk_writel(u32 val, u32 __iomem *reg)
>
> #endif /* platform dependent I/O accessors */
>
> +#ifdef CONFIG_DEBUG_FS
> +struct dentry *clk_debugfs_add_file(struct clk *clk, char *name, umode_t mode,
> + void *data, const struct file_operations *fops);
> +#endif
> +
> #endif /* CONFIG_COMMON_CLK */
> #endif /* CLK_PROVIDER_H */
> --
> 1.7.7.rc0.72.g4b5ea.dirty
>
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