From d4d7e3ddc76c5ae3b4fbd15cb6f30aa78c28d788 Mon Sep 17 00:00:00 2001 From: Mike Turquette Date: Mon, 26 Mar 2012 16:15:52 -0700 Subject: [PATCH] clk: core: enforce clk_ops consistency Documentation/clk.txt has some handsome ASCII art outlining which clk_ops are mandatory for a given clock, given the capability of the hardware. Enforce those mandates with sanity checks in __clk_init. Signed-off-by: Mike Turquette --- drivers/clk/clk.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index d83a9e09e1b..9924aec17aa 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1202,6 +1202,20 @@ void __clk_init(struct device *dev, struct clk *clk) if (__clk_lookup(clk->name)) goto out; + /* check that clk_ops are sane. See Documentation/clk.txt */ + if (clk->ops->set_rate && + !(clk->ops->round_rate && clk->ops->recalc_rate)) { + pr_warning("%s: %s must implement .round_rate & .recalc_rate\n", + __func__, clk->name); + goto out; + } + + if (clk->ops->set_parent && !clk->ops->get_parent) { + pr_warning("%s: %s must implement .get_parent & .set_parent\n", + __func__, clk->name); + goto out; + } + /* throw a WARN if any entries in parent_names are NULL */ for (i = 0; i < clk->num_parents; i++) WARN(!clk->parent_names[i], -- 2.41.0