[PATCH] arm64: dts: sdm845: Fix xo_board clock name and speed

From: Douglas Anderson
Date: Wed May 09 2018 - 16:05:51 EST

The RPMh clock driver assumes that the xo_board clock is named
"xo_board", not "xo-board". Add a "clock-output-names" property to
the device tree to get the right name.

Also add the proper speed for the xo-clock as 38400000. This is
internally divided in RPMh clock driver to get "bi_tcxo" at 19200000.

After this change the clock tree in /sys/kernel/debug/clk/clk_summary
looks much better.

- Technically you could argue that this clock could belong in board
.dts files, not in the SoC one. However at the moment it's believed
that 100% of sdm845 boards will have an external clock at 38.4. It
can always be moved later if necessary.
- We could rename the "xo-board" device tree node to "xo_board" to
achieve the same effect as this patch. Presumably device-tree folks
would rather keep node names using dashes though.
- We could change the RPMh clock driver to use a dash to achieve the
same effect as this patch, but all other clocks in the clock tree
use underscores. It seems silly to change just this one.

Fixes: 7bafa643647f ("arm64: dts: sdm845: Add minimal dts/dtsi files for sdm845 SoC and MTP")
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>

arch/arm64/boot/dts/qcom/sdm845.dtsi | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 486ace9a9e8b..4945f8cccd6c 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -137,7 +137,8 @@
xo_board: xo-board {
compatible = "fixed-clock";
#clock-cells = <0>;
- clock-frequency = <19200000>;
+ clock-frequency = <38400000>;
+ clock-output-names = "xo_board";

sleep_clk: sleep-clk {