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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>
hifive-unleashed-5.1
Paul Cercueil 2018-05-20 16:31:13 +00:00 committed by Stephen Boyd
parent 7ef3844fc5
commit 261a831f04
2 changed files with 5 additions and 0 deletions
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3
drivers/clk/ingenic/cgu.c
View File

@ -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;

2
drivers/clk/ingenic/cgu.h
View File

@ -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;
};
/**