From: Thierry Reding <treding@xxxxxxxxxx>
The external memory controller can be used as a cooling device for the
LPDDR chips. Hook it up to the "mem" thermal zone of the SOCTHERM block
so that temperature polling can be enabled on the EMC when a given
temperature is exceeded.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
Changes in v6:
- new patch
arch/arm64/boot/dts/nvidia/tegra210.dtsi | 28 +++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/boot/dts/nvidia/tegra210.dtsi b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
index 3fa92dd8350b..a550e7b828e6 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
@@ -895,7 +895,7 @@ mc: memory-controller@70019000 {
#iommu-cells = <1>;
};
- external-memory-controller@7001b000 {
+ emc: external-memory-controller@7001b000 {
compatible = "nvidia,tegra210-emc";
reg = <0x0 0x7001b000 0x0 0x1000>,
<0x0 0x7001e000 0x0 0x1000>,
@@ -904,6 +904,7 @@ external-memory-controller@7001b000 {
clock-names = "emc";
interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
nvidia,memory-controller = <&mc>;
+ #cooling-cells = <2>;
};
sata@70020000 {
@@ -1561,6 +1562,18 @@ mem {
<&soctherm TEGRA124_SOCTHERM_SENSOR_MEM>;
trips {
+ dram_nominal: mem-nominal-trip {
+ temperature = <50000>;
+ hysteresis = <1000>;
+ type = "passive";
+ };
+
+ dram_throttle: mem-throttle-trip {
+ temperature = <70000>;
+ hysteresis = <1000>;
+ type = "active";
+ };
+
mem-shutdown-trip {
temperature = <103000>;
hysteresis = <0>;
@@ -1569,10 +1582,15 @@ mem-shutdown-trip {
};
cooling-maps {
- /*
- * There are currently no cooling maps,
- * because there are no cooling devices.
- */
+ dram-passive {
+ cooling-device = <&emc 0 0>;
+ trip = <&dram_nominal>;
+ };
+
+ dram-active {
+ cooling-device = <&emc 1 1>;
+ trip = <&dram_throttle>;
+ };
};
};
--
2.24.1
