Re: [PATCH v6 5/5] arm64: dts: qcom: Update IPQ9574 xo_board_clk to use fixed factor clock

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On 12/13/2024 6:30 PM, Jie Luo wrote:


On 12/13/2024 2:33 AM, Konrad Dybcio wrote:
On 7.11.2024 10:50 AM, Luo Jie wrote:
xo_board_clk is fixed to 24 MHZ, which is routed from WiFi output clock
48 MHZ (also being the reference clock of CMN PLL) divided 2 by analog
block routing channel.

Signed-off-by: Luo Jie <quic_luoj@xxxxxxxxxxx>
---
  arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi | 7 ++++++-
  arch/arm64/boot/dts/qcom/ipq9574.dtsi            | 3 ++-
  2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi b/arch/ arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
index 78f6a2e053d5..9a8692377176 100644
--- a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
@@ -174,8 +174,13 @@ &ref_48mhz_clk {
      clock-mult = <1>;
  };
+/*
+ * The frequency of xo_board_clk is fixed to 24 MHZ, which is routed
+ * from WiFi output clock 48 MHZ divided by 2.
+ */
  &xo_board_clk {
-    clock-frequency = <24000000>;
+    clock-div = <2>;
+    clock-mult = <1>;
  };
  &xo_clk {
diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/ dts/qcom/ipq9574.dtsi
index 8246a00a3e3e..25aed33e9358 100644
--- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
@@ -32,7 +32,8 @@ sleep_clk: sleep-clk {
          };
          xo_board_clk: xo-board-clk {
-            compatible = "fixed-clock";
+            compatible = "fixed-factor-clock";
+            clocks = <&ref_48mhz_clk>;

This must be squashed with the previous patch, you can't introduce
code and replace it immediately afterwards.

Konrad

Hi Konrad,

Looking at this comment again, there may have been some
misunderstanding. We are not introducing xo_board_clk in patch 4 of this
series. xo_board_clk is a pre-existing node.

As part of this additional patch 5, we wanted to address Dmitry's
comment earlier in v5 (reference to comment below), by converting the
xo_board_clk as well to a fixed-factor clock. So it is better to keep
this change as a separate patch in my view. Hope this is OK.

https://lore.kernel.org/linux-arm-msm/CAA8EJpoQO7=v8QWeH8MAgX4uU=m4VJqfC3J5PKyySM2TBcHWiw@xxxxxxxxxxxxxx/


Ok, I will update the patch series with this patch dislodged, and push
this single patch in next update. Thanks.







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