clk: qcom: support for dynamic updating the PLL

Some of the Alpha PLLs support dynamic update in which the
frequency can be changed dynamically without turning off the PLL.

This dynamic update requires the following sequence:

 1. Write the desired values to L_VAL and ALPHA_VAL registers
 2. Toggle pll_latch_input from low to high
 3. Wait for pll_ack_latch to transition from low to high
    The new L and alpha values have been latched. It may
    take some time for the PLL to fully settle with these
    new values.
 4. Pull pll_latch_input low

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index c9c1f2f911b4..82fef8f1c9af 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -60,6 +60,7 @@ struct clk_alpha_pll {
 	size_t num_vco;
 #define SUPPORTS_OFFLINE_REQ	BIT(0)
 #define SUPPORTS_FSM_MODE	BIT(2)
+#define SUPPORTS_DYNAMIC_UPDATE	BIT(3)
 	u8 flags;
 
 	struct clk_regmap clkr;