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davinci: enable easy top down traversal of clock tree
Achieve easy top down traversal of clock tree by keeping track of each clock's list of children. This is useful in supporting DVFS where clock rates of all children need to be updated in an efficient manner. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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parent
cd87444802
commit
f02bf3b396
2 changed files with 9 additions and 3 deletions
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@ -123,8 +123,12 @@ int clk_register(struct clk *clk)
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clk->name, clk->parent->name))
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return -EINVAL;
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INIT_LIST_HEAD(&clk->children);
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mutex_lock(&clocks_mutex);
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list_add_tail(&clk->node, &clocks);
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if (clk->parent)
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list_add_tail(&clk->childnode, &clk->parent->children);
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mutex_unlock(&clocks_mutex);
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/* If rate is already set, use it */
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@ -146,6 +150,7 @@ void clk_unregister(struct clk *clk)
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mutex_lock(&clocks_mutex);
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list_del(&clk->node);
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list_del(&clk->childnode);
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mutex_unlock(&clocks_mutex);
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}
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EXPORT_SYMBOL(clk_unregister);
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@ -352,9 +357,8 @@ dump_clock(struct seq_file *s, unsigned nest, struct clk *parent)
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/* REVISIT show device associations too */
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/* cost is now small, but not linear... */
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list_for_each_entry(clk, &clocks, node) {
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if (clk->parent == parent)
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dump_clock(s, nest + NEST_DELTA, clk);
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list_for_each_entry(clk, &parent->children, childnode) {
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dump_clock(s, nest + NEST_DELTA, clk);
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}
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}
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@ -69,6 +69,8 @@ struct clk {
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u8 lpsc;
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u8 psc_ctlr;
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struct clk *parent;
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struct list_head children; /* list of children */
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struct list_head childnode; /* parent's child list node */
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struct pll_data *pll_data;
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u32 div_reg;
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};
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