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clk: Add hardware-enable column to clk summary 

Add "hardware enable" column to the clk summary in order to show actual
hardware enable-state of all clocks. The possible states are "Y/N/?",
where question mark means that state is unknown, i.e. clock isn't a
mux and clk-driver doesn't support is_enabled() callback for this clock.

In conjunction with clk_ignore_unused, this tells us what unused clocks
are left enabled after bootloader. This is also a useful aid for
debugging interactions with firmware which changes clock states without
notifying kernel.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201115203432.13934-1-digetx@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
zero-sugar-mainline-defconfig
Dmitry Osipenko 2020-11-15 23:34:32 +03:00 committed by Stephen Boyd
parent 3650b228f8
commit bf6d43d723
1 changed files with 11 additions and 4 deletions
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15
drivers/clk/clk.c
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@ -2931,7 +2931,14 @@ static void clk_summary_show_one(struct seq_file *s, struct clk_core *c,
else
seq_puts(s, "-----");
seq_printf(s, " %6d\n", clk_core_get_scaled_duty_cycle(c, 100000));
seq_printf(s, " %6d", clk_core_get_scaled_duty_cycle(c, 100000));
if (c->ops->is_enabled)
seq_printf(s, " %9c\n", clk_core_is_enabled(c) ? 'Y' : 'N');
else if (!c->ops->enable)
seq_printf(s, " %9c\n", 'Y');
else
seq_printf(s, " %9c\n", '?');
}
static void clk_summary_show_subtree(struct seq_file *s, struct clk_core *c,
@ -2950,9 +2957,9 @@ static int clk_summary_show(struct seq_file *s, void *data)
struct clk_core *c;
struct hlist_head **lists = (struct hlist_head **)s->private;
seq_puts(s, " enable prepare protect duty\n");
seq_puts(s, " clock count count count rate accuracy phase cycle\n");
seq_puts(s, "---------------------------------------------------------------------------------------------\n");
seq_puts(s, " enable prepare protect duty hardware\n");
seq_puts(s, " clock count count count rate accuracy phase cycle enable\n");
seq_puts(s, "-------------------------------------------------------------------------------------------------------\n");
clk_prepare_lock();