ARM64: dts: meson-gxbb-odroidc2: Disable SCPI DVFS

The current hardware is not able to run with all cores enabled at a
cluster frequency superior at 1536MHz.
But the currently shipped u-boot for the platform still reports an OPP
table with possible DVFS frequency up to 2GHz, and will not change since
the off-tree linux tree supports limiting the OPPs with a kernel parameter.
A recent u-boot change reports the boot-time DVFS around 100MHz and
the default performance cpufreq governor sets the maximum frequency.
Previous version of u-boot reported to be already at the max OPP and
left the OPP as is.
Nevertheless, other governors like ondemand could setup the max frequency
and make the system crash.

This patch disables the DVFS clock and disables cpufreq.

Fixes: 70db166a2baa ("ARM64: dts: meson-gxbb: Add SCPI with cpufreq & sensors Nodes")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
index 238fbeacd330ab7a8bf7a2a6fdf7f1a6e0365499..5d28e1cdc9986a18de73efc9c3a988c4556f1d88 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
@@ -137,6 +137,10 @@
        };
 };
 
+&scpi_clocks {
+       status = "disabled";
+};
+
 &uart_AO {
        status = "okay";
        pinctrl-0 = <&uart_ao_a_pins>;

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 596240c38a9cdd7720077a8f97a5c0111366e550..b35307321b63981cc7c8dee4042d4c0ba99b7ee9 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -55,7 +55,7 @@
                mboxes = <&mailbox 1 &mailbox 2>;
                shmem = <&cpu_scp_lpri &cpu_scp_hpri>;
 
-               clocks {
+               scpi_clocks: clocks {
                        compatible = "arm,scpi-clocks";
 
                        scpi_dvfs: scpi_clocks@0 {