clk: ingenic: Add .set_rate_hook() for PLL clocks

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>
Link: https://lore.kernel.org/r/20221026194345.243007-4-aidanmacdonald.0x0@gmail.com
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
index 75524c606a90110a632567c496c47e0fc8270a0b..1f7ba30f5a1b00a02c143cb98b58a511ef98ecd2 100644 (file)
--- a/drivers/clk/ingenic/cgu.c
+++ b/drivers/clk/ingenic/cgu.c
@@ -232,6 +232,9 @@ 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 a5e44ca7f969e237624cc4ce143ed774ba0c949c..99da9bd86e63e3ef4554c0ac6fe32c10afe63fe8 100644 (file)
--- 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);
 };
 
 /**