clk: qcom: clk-hfpll: Configure l_val in init when required

Add support for pre-configuring default frequency multiplier,
this appears to be required on some platforms like MSM8976.
Without configuring L_VAL device reboots when trying to bring PLL up.

Signed-off-by: Adam Skladowski <a39.skl@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230812112534.8610-3-a39.skl@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: Kiciuk

drivers/clk/qcom/clk-hfpll.c

@@ -44,6 +44,10 @@ static void __clk_hfpll_init_once(struct clk_hw *hw)
 		regmap_write(regmap, hd->user_reg, regval);
 	}
 
+	/* Write L_VAL from conf if it exist */
+	if (hd->l_val)
+		regmap_write(regmap, hd->l_reg, hd->l_val);
+
 	if (hd->droop_reg)
 		regmap_write(regmap, hd->droop_reg, hd->droop_val);
 

drivers/clk/qcom/clk-hfpll.h

@@ -18,6 +18,7 @@ struct hfpll_data {
 	u32 status_reg;
 	u8  lock_bit;
 
+	u32 l_val;
 	u32 droop_val;
 	u32 config_val;
 	u32 user_val;