clk: qcom: apss-ipq6018: ipq5332: add safe source switch for a53pll

Browse source

Stromer Plus PLL found on IPQ53xx doesn't support dynamic
frequency scaling. To achieve the same, we need to park the APPS
PLL source to GPLL0, re configure the PLL and then switch the
source to APSS_PLL_EARLY.

To support this, register a clock notifier to get the PRE_RATE
and POST_RATE notification. Change the APSS PLL source to GPLL0
when PRE_RATE notification is received, then configure the PLL
and then change back the source to APSS_PLL_EARLY.

Additionally, not all SKUs of IPQ53xx support scaling. Hence,
do the above to the SKUs that support scaling.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
Link: https://lore.kernel.org/r/49422d258d67d33a2547fbb7f4f6e72d489c2301.1697781921.git.quic_varada@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

...

This commit is contained in:

Varadarajan Narayanan 2023-10-20 11:49:35 +05:30 • committed by Bjorn Andersson

parent 5b7a4d3d2b

commit 00331227f4

1 changed files with 57 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

58

drivers/clk/qcom/apss-ipq6018.c

View file