clk: qcom: apss-ipq-pll: fix PLL rate for IPQ5018

According to ipq5018.dtsi, the maximum supported rate by the
CPU is 1.008 GHz on the IPQ5018 platform, however the current
configuration of the PLL results in 1.2 GHz rate.

Change the 'L' value in the PLL configuration to limit the
rate to 1.008 GHz. The downstream kernel also uses the same
value [1]. Also add a comment to indicate the desired
frequency.

[1] https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.4/drivers/clk/qcom/apss-ipq5018.c?ref_type=heads#L151

Fixes: 50492f929486 ("clk: qcom: apss-ipq-pll: add support for IPQ5018")
Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240326-fix-ipq5018-apss-pll-rate-v1-1-82ab31c9da7e@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
index 1a6f4db253796d24fffb13b621e7f48f20c1d26b..5f7f537e4ecbe54ef5e84ecdff3c1d781501d2eb 100644 (file)
--- a/drivers/clk/qcom/apss-ipq-pll.c
+++ b/drivers/clk/qcom/apss-ipq-pll.c
@@ -66,8 +66,9 @@ static struct clk_alpha_pll ipq_pll_stromer_plus = {
        },
 };
 
+/* 1.008 GHz configuration */
 static const struct alpha_pll_config ipq5018_pll_config = {
-       .l = 0x32,
+       .l = 0x2a,
        .config_ctl_val = 0x4001075b,
        .config_ctl_hi_val = 0x304,
        .main_output_mask = BIT(0),