Messages in this thread Patch in this message | | | From | Jolly Shah <> | Subject | [RFC PATCH 1/2] drivers: clk: Add clk_get_children support | Date | Mon, 8 Jan 2018 14:16:36 -0800 |
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This API helps to determine the users for any clock.
Signed-off-by: Jolly Shah <jollys@xilinx.com> Signed-off-by: Tejas Patel <tejasp@xilinx.com> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> --- drivers/clk/clk.c | 28 ++++++++++++++++++++++++++++ include/linux/clk-provider.h | 1 + 2 files changed, 29 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index b56c11f..7488787 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -258,6 +258,34 @@ struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw) } EXPORT_SYMBOL_GPL(clk_hw_get_parent); +static unsigned int sibling; + +static void clk_show_subtree(struct clk_core *c, + int level) +{ + struct clk_core *child; + + if (!c) + return; + + if (level == 1) + sibling++; + + hlist_for_each_entry(child, &c->children, child_node) + clk_show_subtree(child, level + 1); +} + +unsigned int clk_get_children(char *name) +{ + struct clk_core *core; + struct clk *pclk = __clk_lookup(name); + + sibling = 0; + core = pclk->core; + clk_show_subtree(core, 0); + return sibling; +} + static struct clk_core *__clk_lookup_subtree(const char *name, struct clk_core *core) { diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 7c925e6..8191a32a 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -743,6 +743,7 @@ unsigned int __clk_get_enable_count(struct clk *clk); unsigned long clk_hw_get_rate(const struct clk_hw *hw); unsigned long __clk_get_flags(struct clk *clk); unsigned long clk_hw_get_flags(const struct clk_hw *hw); +unsigned int clk_get_children(char *name); bool clk_hw_is_prepared(const struct clk_hw *hw); bool clk_hw_is_enabled(const struct clk_hw *hw); bool __clk_is_enabled(struct clk *clk); -- 2.7.4
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