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author | Sascha Hauer <s.hauer@pengutronix.de> | 2020-02-24 12:09:35 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-02-25 09:21:57 +0100 |
commit | 5bf3e793ccef72e11a03ab3066a4893883249c5b (patch) | |
tree | c19ff4c6eb58195ff1f71fba751b87154054a001 /drivers/clk | |
parent | f0b531594f0e7c133fc80ff050171d8ce5f8192a (diff) | |
download | barebox-5bf3e793ccef72e11a03ab3066a4893883249c5b.tar.gz barebox-5bf3e793ccef72e11a03ab3066a4893883249c5b.tar.xz |
clk: print more consistent clock states
In clk_dump we only print the state of clk_is_enabled(). Depending on
the clock this can mean different things. When the clock provides an
is_enabled() callback it will print its result, so the enabled state
matches the hardware state of that clock, but doesn't necessarily mean
its parents are enabled. If a clock does not provide an is_enabled()
callback then we rely on our internal enable_count tracker.
Change this to always print the hardware state of the current clock. It
can be:
- disabled: The clock is disabled (as provided by is_enabled())
- enabled: The clock is enabled (as provided by is_enabled())
- always enabled: The clock can't be disabled (no is_enabled callback
and can't be enabled/disabled)
- unknown: no is_enabled callback but can be enabled/disabled
Additionally we print the enable_count variable, so from enable_count !=
0 we can know that barebox has enabled the clock.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/clk.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 5777c9c58e..b27ad6d249 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -632,12 +632,40 @@ int of_clk_init(struct device_node *root, const struct of_device_id *matches) } #endif +static const char *clk_hw_stat(struct clk *clk) +{ + if (clk->ops->is_enabled) { + if (clk->ops->is_enabled(clk)) + return "enabled"; + else + return "disabled"; + } + + if (!clk->ops->enable) + return "always enabled"; + + return "unknown"; +} + static void dump_one(struct clk *clk, int verbose, int indent) { struct clk *c; + int enabled = clk_is_enabled(clk); + const char *hwstat, *stat; + + hwstat = clk_hw_stat(clk); + + if (enabled == 0) + stat = "disabled"; + else + stat = "enabled"; + + printf("%*s%s (rate %lu, enable_count: %d, %s)\n", indent * 4, "", + clk->name, + clk_get_rate(clk), + clk->enable_count, + hwstat); - printf("%*s%s (rate %lu, %sabled)\n", indent * 4, "", clk->name, clk_get_rate(clk), - clk_is_enabled(clk) ? "en" : "dis"); if (verbose) { if (clk->num_parents > 1) { |