imx8ulp: clock: Handle the DDRLOCKED when setting DDR clock

The DDRLOCKED bit in CGC2 DDRCLK will auto lock up and down by HW
according to DDR DIV updating or DDR CLK halt status change. So DDR
PCC disable/enable will trigger the lock up/down flow. We
need wait until unlock to ensure clock is ready.

And before configuring the DDRCLK DIV, we need polling the DDRLOCKED
until it is unlocked. Otherwise writing ti DIV bits will not set.

Reviewed-by: Peng Fan <[email protected]>
Signed-off-by: Ye Li <[email protected]>
Signed-off-by: Peng Fan <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-imx8ulp/cgc.h b/arch/arm/include/asm/arch-imx8ulp/cgc.h
index e15ef1d6c15..ad3edc85adb 100644
--- a/arch/arm/include/asm/arch-imx8ulp/cgc.h
+++ b/arch/arm/include/asm/arch-imx8ulp/cgc.h
@@ -152,6 +152,7 @@ void cgc1_soscdiv_init(void);
 void cgc1_init_core_clk(void);
 void cgc2_pll4_init(void);
 void cgc2_ddrclk_config(u32 src, u32 div);
+void cgc2_ddrclk_wait_unlock(void);
 u32 cgc1_sosc_div(enum cgc_clk clk);
 void cgc1_enet_stamp_sel(u32 clk_src);
 void cgc2_pll4_pfd_config(enum cgc_clk pllpfd, u32 pfd);