diff mbox series

[v1,3/5] clk: ingenic: Add .set_rate_hook() for PLL clocks

Message ID 20221023145653.177234-4-aidanmacdonald.0x0@gmail.com
State Accepted
Commit c799a77720dd350fd742a99d80139514a0b4df4d
Headers show
Series [v1,1/5] clk: ingenic: Make PLL clock "od" field optional | expand

Commit Message

Aidan MacDonald Oct. 23, 2022, 2:56 p.m. UTC 
The set rate hook is called immediately after updating the clock
register but before the spinlock is released. This allows another
register to be updated alongside the main one, which is needed to
handle the I2S divider on some SoCs.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
---
 drivers/clk/ingenic/cgu.c | 3 +++
 drivers/clk/ingenic/cgu.h | 4 ++++
 2 files changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
index bbb55e8d8b55..574d5fe10fdf 100644
--- a/drivers/clk/ingenic/cgu.c
+++ b/drivers/clk/ingenic/cgu.c
@@ -233,6 +233,9 @@  ingenic_pll_set_rate(struct clk_hw *hw, unsigned long req_rate,
 
 	writel(ctl, cgu->base + pll_info->reg);
 
+	if (pll_info->set_rate_hook)
+		pll_info->set_rate_hook(pll_info, rate, parent_rate);
+
 	/* If the PLL is enabled, verify that it's stable */
 	if (pll_info->enable_bit >= 0 && (ctl & BIT(pll_info->enable_bit)))
 		ret = ingenic_pll_check_stable(cgu, pll_info);
diff --git a/drivers/clk/ingenic/cgu.h b/drivers/clk/ingenic/cgu.h
index a5e44ca7f969..99da9bd86e63 100644
--- a/drivers/clk/ingenic/cgu.h
+++ b/drivers/clk/ingenic/cgu.h
@@ -46,6 +46,8 @@ 
  *		-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
+ * @set_rate_hook: hook called immediately after updating the CGU register,
+ *		   before releasing the spinlock
  */
 struct ingenic_cgu_pll_info {
 	unsigned reg;
@@ -61,6 +63,8 @@  struct ingenic_cgu_pll_info {
 	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);
+	void (*set_rate_hook)(const struct ingenic_cgu_pll_info *pll_info,
+			      unsigned long rate, unsigned long parent_rate);
 };
 
 /**