diff options
| author | Paul Cercueil <paul@crapouillou.net> | 2018-05-20 16:31:13 +0000 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2018-06-01 23:21:31 -0700 |
| commit | 261a831f042c906412099e8a4f73d954cb5370b4 (patch) | |
| tree | 4329e2479b1ce640f04f9d7355a2d84ee5fcbf3a /drivers/clk | |
| parent | 7ef3844fc5198065dbe8776798206c10859d209e (diff) | |
| download | linux-261a831f042c906412099e8a4f73d954cb5370b4.tar.bz2 | |
clk: ingenic: Support specifying "wait for clock stable" delay
Some clocks need a small delay after being ungated to run stable, as
using them too soon might result in hardware lockups.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/ingenic/cgu.c | 3 | ||||
| -rw-r--r-- | drivers/clk/ingenic/cgu.h | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c index 4b31145eb8aa..5ef7d9ba2195 100644 --- a/drivers/clk/ingenic/cgu.c +++ b/drivers/clk/ingenic/cgu.c @@ -512,6 +512,9 @@ static int ingenic_clk_enable(struct clk_hw *hw) spin_lock_irqsave(&cgu->lock, flags); ingenic_cgu_gate_set(cgu, &clk_info->gate, false); spin_unlock_irqrestore(&cgu->lock, flags); + + if (clk_info->gate.delay_us) + udelay(clk_info->gate.delay_us); } return 0; diff --git a/drivers/clk/ingenic/cgu.h b/drivers/clk/ingenic/cgu.h index 4d2e3fad0e30..542192376ebf 100644 --- a/drivers/clk/ingenic/cgu.h +++ b/drivers/clk/ingenic/cgu.h @@ -112,11 +112,13 @@ struct ingenic_cgu_fixdiv_info { * @reg: offset of the gate control register within the CGU * @bit: offset of the bit in the register that controls the gate * @clear_to_gate: if set, the clock is gated when the bit is cleared + * @delay_us: delay in microseconds after which the clock is considered stable */ struct ingenic_cgu_gate_info { unsigned reg; u8 bit; bool clear_to_gate; + u16 delay_us; }; /** |