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clk: ingenic: Make PLL clock enable_bit and stable_bit optional 

When the enable bit is undefined, the clock is assumed to be always
on and enable/disable is a no-op. When the stable bit is undefined,
the PLL stable check is a no-op.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Link: https://lore.kernel.org/r/20221026194345.243007-3-aidanmacdonald.0x0@gmail.com
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Aidan MacDonald 2022-10-26 20:43:41 +01:00 committed by Stephen Boyd
parent 83b975b5aa
commit d84bf9d630
2 changed files with 19 additions and 5 deletions
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14
drivers/clk/ingenic/cgu.c
View File

@ -189,6 +189,9 @@ static inline int ingenic_pll_check_stable(struct ingenic_cgu *cgu,
{
u32 ctl;
if (pll_info->stable_bit < 0)
return 0;
return readl_poll_timeout(cgu->base + pll_info->reg, ctl,
ctl & BIT(pll_info->stable_bit),
0, 100 * USEC_PER_MSEC);
@ -230,7 +233,7 @@ ingenic_pll_set_rate(struct clk_hw *hw, unsigned long req_rate,
writel(ctl, cgu->base + pll_info->reg);
/* If the PLL is enabled, verify that it's stable */
if (ctl & BIT(pll_info->enable_bit))
if (pll_info->enable_bit >= 0 && (ctl & BIT(pll_info->enable_bit)))
ret = ingenic_pll_check_stable(cgu, pll_info);
spin_unlock_irqrestore(&cgu->lock, flags);
@ -248,6 +251,9 @@ static int ingenic_pll_enable(struct clk_hw *hw)
int ret;
u32 ctl;
if (pll_info->enable_bit < 0)
return 0;
spin_lock_irqsave(&cgu->lock, flags);
if (pll_info->bypass_bit >= 0) {
ctl = readl(cgu->base + pll_info->bypass_reg);
@ -278,6 +284,9 @@ static void ingenic_pll_disable(struct clk_hw *hw)
unsigned long flags;
u32 ctl;
if (pll_info->enable_bit < 0)
return;
spin_lock_irqsave(&cgu->lock, flags);
ctl = readl(cgu->base + pll_info->reg);
@ -295,6 +304,9 @@ static int ingenic_pll_is_enabled(struct clk_hw *hw)
const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
u32 ctl;
if (pll_info->enable_bit < 0)
return true;
ctl = readl(cgu->base + pll_info->reg);
return !!(ctl & BIT(pll_info->enable_bit));

10
drivers/clk/ingenic/cgu.h
View File

@ -42,8 +42,10 @@
* @bypass_reg: the offset of the bypass control register within the CGU
* @bypass_bit: the index of the bypass bit in the PLL control register, or
* -1 if there is no bypass bit
* @enable_bit: the index of the enable bit in the PLL control register
* @stable_bit: the index of the stable bit in the PLL control register
* @enable_bit: the index of the enable bit in the PLL control register, or
* -1 if there is no enable bit (ie, the PLL is always on)
* @stable_bit: the index of the stable bit in the PLL control register, or
* -1 if there is no stable bit
*/
struct ingenic_cgu_pll_info {
unsigned reg;
@ -54,8 +56,8 @@ struct ingenic_cgu_pll_info {
u8 od_shift, od_bits, od_max;
unsigned bypass_reg;
s8 bypass_bit;
u8 enable_bit;
u8 stable_bit;
s8 enable_bit;
s8 stable_bit;
void (*calc_m_n_od)(const struct ingenic_cgu_pll_info *pll_info,
unsigned long rate, unsigned long parent_rate,
unsigned int *m, unsigned int *n, unsigned int *od);